0001846069-23-000010 | 10-K | XBRL Viewer

Commitments and Contingencies

12 Months Ended

Dec. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Commitments

As of December 31, 2022, the Company had non-cancellable purchase commitments with certain service providers primarily related to the provision of cloud computing services as follows (in thousands):


2023	$	24,770
2024	10,261
2025	1,258
Thereafter	1,326
Total	$	37,615

Legal matters

From time to time, the Company is a party to a variety of claims, lawsuits, and proceedings which arise in the ordinary course of business, including claims of alleged infringement of intellectual property rights. The Company records a liability when it believes that it is probable that a loss will be incurred and the amount of loss or range of loss can be reasonably estimated. The Company discloses potential losses when they are reasonably possible. In the Company’s opinion, resolution of pending matters is not likely to have a material adverse impact on its consolidated results of operations, cash flows, or its financial position. Given the unpredictable nature of legal proceedings, the Company bases its estimate on the information available at the time of the assessment. As additional information becomes available, the Company reassesses the potential liability and may revise the estimate. There were no such material matters as of December 31, 2022 and 2021.

Indemnification

In the ordinary course of business, the Company often includes standard indemnification provisions in its arrangements with its customers, partners, suppliers, and vendors. Pursuant to these provisions, the Company may be obligated to indemnify such parties for losses or claims suffered or incurred in connection with its service, breach of representations or covenants, intellectual property infringement, or other claims made against such parties. These provisions may limit the time within which an indemnification claim can be made. It is not possible to determine the maximum potential amount under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. For the years ended December 31, 2022, 2021 and 2020, the Company did not incur material costs to defend lawsuits or settle claims related to these indemnifications. The Company believes the fair value of these liabilities is not material and accordingly has no liabilities recorded for these agreements as of December 31, 2022 and 2021.

Opportunity Finance Network Loan Agreement

On June 29, 2022, the Company entered into a credit agreement with Opportunity Finance Network (“OFN”) to lend up to an aggregate of $15.0 million, unsecured, over the course of 24 months. OFN is a national network of community development financial

institutions (“CDFIs”). OFN will use the loan proceeds to make low-cost, fixed-rate loans to OFN-member CDFIs that on-lend those loan proceeds to fund affordable housing, community facilities, small businesses, nonprofit organizations, consumer finance, and other eligible financing extended by such CDFIs. OFN may borrow in increments of $2.0 million or more and may not borrow more than $7.5 million within the first 12 months immediately following the closing date of June 29, 2022. Each disbursement made by the Company will bear interest at a rate of 0.75% per annum and will be due quarterly from OFN. The outstanding principal, plus any accrued and unpaid interest, for each disbursement becomes due and payable 10 years following the disbursement date. During the year ended December 31, 2022, the Company made one loan disbursement of $5.0 million.

Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Schedule of Cash and Cash Equivalents

The amortized costs, unrealized gains and losses, and estimated fair values of the Company’s cash equivalents and marketable securities were as follows (in thousands):


	As of December 31, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	20,381	$	—	$	—	$	20,381
Corporate bonds	6,021		3		—		6,024
Commercial paper	9,394		—		(3)		9,391
Total cash equivalents	$	35,796	$	3	$	(3)	$	35,796
Marketable securities:
Certificates of deposit	44,732		9		(191)		44,550
Commercial paper	100,909		27		(92)		100,844
Corporate bonds	280,023		11		(1,980)		278,054
U.S. Treasury securities	41,646		3		(123)		41,526
U.S. Agency bonds	46,366		66		(22)		46,410
Asset-backed securities	16,798		—		(115)		16,683
Total marketable securities	530,474		116		(2,523)		528,067
Total	$	566,270	$	119	$	(2,526)	$	563,863


	As of December 31, 2021
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	474,294	$	—	$	—	$	474,294
Marketable securities:
Commercial paper	83,728		—		—		83,728
Corporate bonds	78,353		24		(14)		78,363
U.S. Treasury securities	15,200		—		(12)		15,188
Asset-backed securities	16,735		—		(15)		16,720
Total marketable securities	194,016		24		(41)		193,999
Total	$	668,310	$	24	$	(41)	$	668,293

Schedule of Marketable Securities

The amortized costs, unrealized gains and losses, and estimated fair values of the Company’s cash equivalents and marketable securities were as follows (in thousands):


	As of December 31, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	20,381	$	—	$	—	$	20,381
Corporate bonds	6,021		3		—		6,024
Commercial paper	9,394		—		(3)		9,391
Total cash equivalents	$	35,796	$	3	$	(3)	$	35,796
Marketable securities:
Certificates of deposit	44,732		9		(191)		44,550
Commercial paper	100,909		27		(92)		100,844
Corporate bonds	280,023		11		(1,980)		278,054
U.S. Treasury securities	41,646		3		(123)		41,526
U.S. Agency bonds	46,366		66		(22)		46,410
Asset-backed securities	16,798		—		(115)		16,683
Total marketable securities	530,474		116		(2,523)		528,067
Total	$	566,270	$	119	$	(2,526)	$	563,863


	As of December 31, 2021
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	474,294	$	—	$	—	$	474,294
Marketable securities:
Commercial paper	83,728		—		—		83,728
Corporate bonds	78,353		24		(14)		78,363
U.S. Treasury securities	15,200		—		(12)		15,188
Asset-backed securities	16,735		—		(15)		16,720
Total marketable securities	194,016		24		(41)		193,999
Total	$	668,310	$	24	$	(41)	$	668,293

Schedule of Investments Classified by Contractual Maturity Date

The following tables present the contractual maturities of the Company’s marketable securities (in thousands):


	As of December 31, 2022
	Amortized Cost		Estimated Fair Value
Due within one year	$	473,133	$	471,378
Due after one to four years	57,341		56,689
Total	$	530,474	$	528,067


	As of December 31, 2021
	Amortized Cost		Estimated Fair Value
Due within one year	$	137,077	$	137,043
Due after one to four years	56,939		56,956
Total	$	194,016	$	193,999

Leases

12 Months Ended

Dec. 31, 2022

Leases [Abstract]

Leases

The Company has entered into various non-cancellable office facility leases in various locations with original lease periods expiring between 2020 and 2029, with its primary office location in San Francisco, California. The Company entered into a lease consisting of multiple floors for its San Francisco headquarters in 2019, with a lease term through 2029. On January 30, 2023, the Company entered into a lease amendment for its headquarters lease. The lease amendment extended the lease term through April 30, 2032 and will be reflected in our first quarter 2023 Form 10-Q. The first portion of the lease commenced in June 2020, and the second portion of the lease commenced in January 2021. The facility lease agreements generally provide for escalating rental payments. The Company's lease agreements generally do not contain any material residual value guarantees or material restrictive covenants.

The components of lease costs were as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Operating lease cost	$	9,781	$	9,864	$	6,278
Short-term lease cost	1,417		525		495
Variable lease cost	1,665		409		452
Total	$	12,863	$	10,798	$	7,225

Other information related to the Company’s operating leases was as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	10,045	$	6,585	$	5,624
ROU assets obtained in exchange for new operating lease liabilities:	$	—	$	28,252	$	39,664

Lease terms and discount rates for operating leases were as follows:


	As of December 31,
	2022		2021

Weighted average remaining lease term (years)	6.3		7.3
Weighted average discount rate	4.5	%	4.5	%

As of December 31, 2022, future minimum lease payments under operating leases were as follows (in thousands):


2023	$	10,347
2024	10,657
2025	10,977
2026	11,306
2027	11,645
Thereafter	16,052
Total lease payments	70,984
Less: imputed interest	(9,387)
Present value of lease liabilities	61,597
Less: current operating lease liabilities	(7,766)
Long-term operating lease liabilities	$	53,831

The table above does not include lease payments that were not fixed at commencement or lease modification.

Reverse Recapitalization

12 Months Ended

Dec. 31, 2022

Reverse Recapitalization [Abstract]

Reverse Recapitalization

Pursuant to the Merger Agreement, as described in Note 1, Merger Sub merged with and into Legacy Nextdoor, with Legacy Nextdoor surviving the Merger. Legacy Nextdoor became a wholly owned subsidiary of KVSB and KVSB was immediately renamed Nextdoor Holdings, Inc. Upon the consummation of the Merger, the following events contemplated by the Merger Agreement occurred, based on Legacy Nextdoor’s capitalization as of November 5, 2021:

•all 61,331,815 issued and outstanding shares of Legacy Nextdoor redeemable convertible preferred stock were converted into 61,331,815 shares of Legacy Nextdoor common stock at the conversion rate as calculated pursuant to Legacy Nextdoor’s certificate of incorporation;

•all 97,886,321 issued and outstanding shares of Legacy Nextdoor common stock (including Legacy Nextdoor common stock resulting from the conversion of the Legacy Nextdoor redeemable convertible preferred stock) were converted into 304,003,976 shares of Nextdoor Class B common stock after giving effect to the exchange ratio of 3.1057 as calculated in accordance with the Merger Agreement (“Exchange Ratio”);

•all 19,196,313 granted and outstanding unexercised Legacy Nextdoor options were converted into 59,616,898 Nextdoor options exercisable for shares of Nextdoor Class B common stock with the same terms and vesting conditions except for the number of shares exercisable and the exercise price, each of which was adjusted by the Exchange Ratio;

•all 866,687 granted and outstanding unvested Legacy Nextdoor restricted stock units (“RSUs”) were converted into 2,691,577 Nextdoor RSUs for shares of Nextdoor Class B common stock with the same terms and vesting conditions except for the number of shares, which was adjusted by the Exchange Ratio; and

•the entitlement to receive 58,135 shares of Legacy Nextdoor common stock pursuant to the Pixel Labs Merger Agreement converted into the right to receive 180,549 shares of Nextdoor Class B common stock, which was adjusted by the Exchange Ratio.

There were 304,003,976 shares of Nextdoor Class B common stock issued and outstanding as of the Closing and Nextdoor options and RSUs covering 62,308,475 shares reserved for the potential future issuance of Nextdoor Class B common stock as of the Closing.

In connection with the Closing of the Merger:

•all KVSB Class B founder shares, consisting of 5,000,000 shares of KVSB Class B common stock, automatically converted into an aggregate of 7,347,249 shares of Nextdoor Class A common stock;

•all KVSB Class K founder shares, consisting of 5,000,000 shares of KVSB Class K common stock, converted into an aggregate of 3,061,354 shares of Nextdoor Class A common stock;

•all 1,132,688 private placement sponsor shares of KVSB Class A common stock converted into shares of Nextdoor Class A common stock on a one-to-one basis; and

•40,412,372 shares of KVSB Class A common stock held by KVSB public stockholders, net of the redemption of 1,222,040 shares of KVSB Class A common stock, converted into Nextdoor Class A common stock on a one-to-one basis.

On July 6, 2021, concurrently with the execution of the Merger Agreement, KVSB entered into subscription agreements with certain investors (collectively, the “PIPE Investors”), pursuant to, and on the terms and subject to the conditions of which, the PIPE Investors subscribed for an aggregate of 27,000,000 shares of Class A common stock, which included 750,000 shares of Nextdoor Class A

common stock to the KVSB sponsor and 4,500,000 shares of Nextdoor Class A common stock to certain Legacy Nextdoor stockholders, including 500,000 shares of Nextdoor Class A common stock to Nextdoor's Chief Executive Officer and President, for an aggregate purchase price of $270.0 million (the “PIPE Investment”). The PIPE Investment was consummated substantially concurrently with the Closing of the Merger.

There were 78,953,663 shares of Nextdoor Class A common stock issued and outstanding as of the Closing.

Each holder of shares of Class A common stock is entitled to one vote for each share of Class A common stock held on all matters submitted to a vote of stockholders and each holder of shares of Class B common stock is entitled to 10 votes for each share of Class B common stock held on all matters submitted to a vote of stockholders.

The following table presents the number of shares of common stock issued and outstanding immediately following the Reverse Recapitalization:


			Shares
KVSB Class A common stock, outstanding prior to Reverse Recapitalization			42,767,100
Less: redemption of KVSB Class A common stock			(1,222,040)
Conversion of KVSB Class B founder shares			7,347,249
Conversion of KVSB Class K common stock			3,061,354
Shares issued to PIPE Investors			27,000,000
Nextdoor Class A common stock			78,953,663

Conversion of Legacy Nextdoor common stock (1)			113,526,555
Conversion of Legacy Nextdoor redeemable convertible preferred stock (2)			190,477,421
Nextdoor Class B common stock			304,003,976

Total shares of common stock immediately after Reverse Recapitalization			382,957,639

(1) Upon the completion of the Reverse Recapitalization, the 36,554,506 outstanding shares of Legacy Nextdoor common stock were converted into shares of Nextdoor Class B common stock using the Exchange Ratio.

(2) Upon the completion of the Reverse Recapitalization, all 61,331,815 outstanding shares of Legacy Nextdoor redeemable convertible preferred stock converted into Legacy Nextdoor common stock on a one-to-one basis, which were then converted into shares of Nextdoor Class B common stock using the Exchange Ratio.

KVSB was treated as the “acquired” company for financial reporting purposes. Accordingly, the financial statements of Nextdoor represent the continuation of the financial statements of Legacy Nextdoor, with the Merger reflected as the equivalent of Nextdoor issuing common stock for the net assets of KVSB, accompanied by a recapitalization. The net assets of KVSB were recognized as of the Closing at historical cost, with no goodwill or other intangible assets recorded. Operations prior to the Merger are those of Legacy Nextdoor and Legacy Nextdoor’s operations are the only ongoing operations of Nextdoor.

In connection with the Reverse Recapitalization, the Company raised $628.5 million of proceeds, presented as cash flows from financing activities, which included the contribution of $416.4 million of funds held in KVSB’s trust account, $0.2 million of cash held in KVSB’s operating cash account, and $270.0 million of proceeds from the PIPE Investment, net of $12.2 million paid to redeem 1,222,040 public shares of KVSB’s Class A common stock and $45.9 million in transaction costs incurred by KVSB. Legacy Nextdoor incurred $5.7 million of transaction costs, which consisted of direct incremental legal, accounting, consulting, and other fees which were recorded as deferred transaction costs and upon completion of the Reverse Recapitalization were reclassified to additional paid-in capital as a reduction of the net proceeds received.

The shares and corresponding capital amounts and all per share data related to Legacy Nextdoor’s outstanding redeemable convertible preferred stock, common stock, and stock-based awards prior to the Reverse Recapitalization have been retroactively adjusted using the Exchange Ratio.

Income Taxes - Effective Tax Rate (Details)	12 Months Ended
Income Taxes - Effective Tax Rate (Details)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Statutory rate	(21.00%)	(21.00%)	(21.00%)
State tax	0.20%	0.20%	(2.50%)
Permanent items	0.90%	0.70%	0.40%
Transaction costs	0.00%	(4.80%)	0.00%
Stock-based compensation	5.30%	6.60%	4.30%
R&D credit	(3.20%)	(4.20%)	(4.20%)
Other	0.50%	0.00%	0.10%
Changes in valuation allowance	18.50%	22.80%	22.90%
Foreign rate differential	0.00%	(0.10%)	0.20%
Effective tax rate	1.20%	0.20%	0.20%

Fair Value Measurements

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value Measurements

The Company’s financial assets and liabilities measured at fair value on a recurring basis are classified by level within the fair value hierarchy. There were no financial assets or liabilities measured using Level 3 inputs as of December 31, 2022 and 2021. The following table presents information about the Company’s financial assets that are measured at fair value on a recurring basis (in thousands):


	As of December 31, 2022
	Level 1		Level 2		Total
Cash equivalents:
Money market funds	$	20,381	$	—	$	20,381
Corporate bonds	—		6,024		6,024
Commercial paper	—		9,391		9,391
Total cash equivalents	$	20,381	$	15,415	$	35,796
Marketable securities:
Certificates of deposit	—		44,550		44,550
Commercial paper	—		100,844		100,844
Corporate bonds	—		278,054		278,054
U.S. Treasury securities	—		41,526		41,526
U.S. Agency bonds	—		46,410		46,410
Asset-backed securities	—		16,683		16,683
Total marketable securities	—		528,067		528,067


Total	$	20,381	$	543,482	$	563,863


	As of December 31, 2021
	Level 1		Level 2		Total
Cash equivalents:
Money market funds	$	474,294	$	—	$	474,294
Marketable securities:
Commercial paper	—		83,728		83,728
Corporate bonds	—		78,363		78,363
U.S. Treasury securities	—		15,188		15,188
Asset-backed securities	—		16,720		16,720
Total marketable securities	—		193,999		193,999
Total	$	474,294	$	193,999	$	668,293

The Company classifies its cash equivalents, marketable securities, and note receivable within Level 1 or Level 2 because it determines their fair values using quoted market prices or alternative pricing sources and models utilizing market observable inputs. There were no transfers between levels of the fair value hierarchy during the years ended December 31, 2022 and 2021.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The carrying amounts of certain financial instruments, including cash held in banks, accounts receivable, and accounts payable approximate fair value due to their short-term maturities and are excluded from the fair value table above.

Financial Instruments, Assets, and Liabilities Not Recorded at Fair Value

The following table presents the fair value hierarchy for financial instruments, assets, and liabilities not recorded at fair value (in thousands):


	As of December 31, 2022
	Carrying Amount		Level 1		Level 2		Level 3		Fair Value
Assets
Note receivable	$	5,000	$	—	$	—	$	4,646	$	4,646

As of December 31, 2021, the Company did not have any financial instruments, assets or liabilities not recorded at fair value.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Redeemable Convertible Preferred Stock, Common Stock, and Stockholders’ Equity (Deficit) - Fair Value Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum (as a percent)	53.90%
Expected volatility, maximum (as a percent)	61.20%
Employee and Non-employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum (as a percent)		53.70%	48.80%
Expected volatility, maximum (as a percent)		54.50%	53.40%
Expected term (years)	6 years 1 month 6 days	6 years 3 months 18 days	6 years
Risk-free interest rate (as a percent)	3.10%	1.10%	0.60%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%
Employee and Non-employee Stock Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock per share (in USD per share)	$ 1.99	$ 4.92	$ 3.89
Employee and Non-employee Stock Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock per share (in USD per share)	$ 6.06	$ 6.83	$ 4.23

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of Fair Value on Recurring Basis

The following table presents information about the Company’s financial assets that are measured at fair value on a recurring basis (in thousands):


	As of December 31, 2022
	Level 1		Level 2		Total
Cash equivalents:
Money market funds	$	20,381	$	—	$	20,381
Corporate bonds	—		6,024		6,024
Commercial paper	—		9,391		9,391
Total cash equivalents	$	20,381	$	15,415	$	35,796
Marketable securities:
Certificates of deposit	—		44,550		44,550
Commercial paper	—		100,844		100,844
Corporate bonds	—		278,054		278,054
U.S. Treasury securities	—		41,526		41,526
U.S. Agency bonds	—		46,410		46,410
Asset-backed securities	—		16,683		16,683
Total marketable securities	—		528,067		528,067


Total	$	20,381	$	543,482	$	563,863


	As of December 31, 2021
	Level 1		Level 2		Total
Cash equivalents:
Money market funds	$	474,294	$	—	$	474,294
Marketable securities:
Commercial paper	—		83,728		83,728
Corporate bonds	—		78,363		78,363
U.S. Treasury securities	—		15,188		15,188
Asset-backed securities	—		16,720		16,720
Total marketable securities	—		193,999		193,999
Total	$	474,294	$	193,999	$	668,293

Schedule of Financial Instruments, Assets, and Liabilities Not Recorded at Fair Value

The following table presents the fair value hierarchy for financial instruments, assets, and liabilities not recorded at fair value (in thousands):


	As of December 31, 2022
	Carrying Amount		Level 1		Level 2		Level 3		Fair Value
Assets
Note receivable	$	5,000	$	—	$	—	$	4,646	$	4,646

Other Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation	$ 6,022	$ 3,375
Employee stock purchase plan liability	2,076	0
Liability for early exercise of unvested stock options	174	690
Taxes payable	1,425	879
Deferred revenue	6,020	3,388
Other accrued and current liabilities	6,645	7,112
Accrued expenses and other current liabilities	$ 22,362	$ 15,444

Geographical Information

12 Months Ended

Dec. 31, 2022

Revenue from Contract with Customer [Abstract]

Geographical Information

Revenue disaggregated by geography based on the customers’ location was as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020

United States	$	204,449	$	183,724	$	119,118
International	8,316		8,473		4,166
Total	$	212,765	$	192,197	$	123,284

Substantially all of the Company’s long-lived assets are located in the United States.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI https://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (d)
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+ Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (137,916)	$ (95,325)	$ (75,234)
Other comprehensive income (loss):
Foreign currency translation adjustments	723	283	(796)
Change in unrealized loss on available-for-sale marketable securities	(2,390)	(15)	(36)
Total other comprehensive income (loss)	(1,667)	268	(832)
Comprehensive loss	$ (139,583)	$ (95,057)	$ (76,066)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of Property and Equipment, Net

Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets as follows:


			Estimated Useful Life
Computer equipment and software			3 years
Furniture and fixtures			5 years
Leasehold improvements			Shorter of the estimated useful life of 5 years or the lease term

Property and equipment, net consisted of the following (in thousands):


	As of December 31,
	2022		2021
Computer equipment and software	$	4,103	$	3,123
Furniture and fixtures	2,209		2,201
Capitalized internal-use software	2,123		1,842
Leasehold improvements	10,597		9,502
Property and equipment, gross	19,032		16,668
Less: accumulated depreciation and amortization	(7,214)		(4,123)
Property and equipment, net	$	11,818	$	12,545

Other Balance Sheet Components - Expected Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2023	$ 1,775
2024	1,057
2025	235
Net Carrying Amount	$ 3,067	$ 4,835

Geographical Information - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 212,765	$ 192,197	$ 123,284
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	204,449	183,724	119,118
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 8,316	$ 8,473	$ 4,166

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Geographical Information (Tables)

12 Months Ended

Dec. 31, 2022

Revenue from Contract with Customer [Abstract]

Schedule of Revenue Disaggregated by Geography

Revenue disaggregated by geography based on the customers’ location was as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020

United States	$	204,449	$	183,724	$	119,118
International	8,316		8,473		4,166
Total	$	212,765	$	192,197	$	123,284

Reverse Recapitalization - Common Stock Issued and Outstanding Following the Reverse Recapitalization (Details) - shares	Nov. 05, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Common stock outstanding (in shares)	382,957,639
Shares issued (in shares)	27,000,000
Redeemable convertible preferred stock issued (in shares)		0	0
Redeemable convertible preferred stock outstanding (in shares)		0	0	190,477,000	190,477,000
Class B Common Stock
Business Acquisition [Line Items]
Common stock outstanding (in shares)	304,003,976	218,029,000	304,701,000
Class A Common Stock
Business Acquisition [Line Items]
Common stock outstanding (in shares)	78,953,663	153,693,000	78,954,000
Conversion of stock (in shares)	113,526,555
Redeemable convertible preferred stock
Business Acquisition [Line Items]
Conversion of stock (in shares)	190,477,421
Conversion ratio (in shares)	1
KVSB \| Class B Common Stock
Business Acquisition [Line Items]
Conversion of shares	7,347,249
Conversion of stock (in shares)	5,000,000
KVSB \| Common Class K
Business Acquisition [Line Items]
Conversion of shares	3,061,354
Conversion of stock (in shares)	5,000,000
KVSB \| Class A Common Stock
Business Acquisition [Line Items]
Less: redemption of KVSB Class A common stock (in shares)	(1,222,040)
Conversion of stock (in shares)	40,412,372
KVSB
Business Acquisition [Line Items]
Common stock outstanding (in shares)	42,767,100
Less: redemption of KVSB Class A common stock (in shares)	(1,222,040)
Legacy Nextdoor
Business Acquisition [Line Items]
Common stock outstanding (in shares)	97,886,321
Legacy Nextdoor \| Class B Common Stock
Business Acquisition [Line Items]
Common stock outstanding (in shares)	36,554,506
Legacy Nextdoor \| Redeemable convertible preferred stock
Business Acquisition [Line Items]
Redeemable convertible preferred stock issued (in shares)	61,331,815
Redeemable convertible preferred stock outstanding (in shares)	61,331,815

Cash Equivalents and Marketable Securities - Maturities of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due within one year	$ 473,133	$ 137,077
Due after one to four years	57,341	56,939
Total	530,474	194,016
Estimated Fair Value
Due within one year	471,378	137,043
Due after one to four years	56,689	56,956
Total	$ 528,067	$ 193,999

Net Loss Per Share Attributable to Common Stockholders

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Net Loss Per Share Attributable to Common Stockholders

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except per share data):


	Year Ended December 31,
	2022				2021				2020
	Class A		Class B		Class A		Class B		Common
Net loss attributable to common stockholders	$	(46,344)	$	(91,572)	$	(8,032)	$	(87,293)	$	(75,234)
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic and diluted	127,266		251,465		12,330		134,007		90,190
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted	$	(0.36)	$	(0.36)	$	(0.65)	$	(0.65)	$	(0.83)

The following potentially dilutive securities outstanding have been excluded from the computations of diluted net loss per share because such securities have an anti-dilutive impact due to losses reported (in thousands):


	Year Ended December 31,
	2022	2021	2020

Redeemable convertible preferred stock	—	—	190,477
Outstanding stock options	55,388	58,278	46,973
Unvested RSUs	21,986	2,511	—
Unvested early exercised stock options subject to repurchase	102	422	693
Unvested restricted stock	—	3,210	7,062
Shares issuable pursuant to the employee stock purchase plan	2,566	—	—
Contingently issuable shares	7	181	204
Total	80,049	64,602	245,409

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation

The consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Company’s fiscal year ends on December 31.

The Merger was accounted for as a reverse recapitalization in accordance with GAAP. This determination was primarily based on the evaluation of the following facts and circumstances:

•Legacy Nextdoor stockholders had a relative majority of the voting power of Nextdoor;

•The Board of Directors of Nextdoor had ten members, and Legacy Nextdoor stockholders had the ability to nominate a majority of the members of the Board of Directors;

•Legacy Nextdoor’s senior management comprised the senior management roles of Nextdoor and were responsible for the day-to-day operations;

•KVSB assumed the Nextdoor Holdings, Inc. name and Legacy Nextdoor’s corporate headquarters; and

•The intended strategy and operations of Nextdoor continued Legacy Nextdoor’s strategy and operations to leverage technology to connect millions of neighbors online and in real life to build stronger, more vibrant, and resilient neighborhoods.

Under this method of accounting, KVSB was treated as the “acquired” company for financial reporting purposes. Accordingly, the financial statements of Nextdoor represent the continuation of the financial statements of Legacy Nextdoor, with the Merger reflected as the equivalent of Nextdoor issuing common stock for the net assets of KVSB, accompanied by a recapitalization. The shares and corresponding capital amounts and all per share data related to Legacy Nextdoor’s outstanding redeemable convertible preferred stock, common stock, and stock-based awards prior to the Reverse Recapitalization have been retroactively adjusted using the Exchange Ratio (as defined in Note 3). The conversion of the outstanding shares of Legacy Nextdoor redeemable convertible preferred stock into shares of Class B common stock in connection with the Reverse Recapitalization and the issuance of Class A common stock are presented as of the Closing of the Merger in the consolidated statements of redeemable convertible preferred stock and stockholders’ equity (deficit). The net assets of KVSB were recognized as of the Closing at historical cost, with no goodwill or other intangible assets recorded. Operations prior to the Merger are those of Legacy Nextdoor and Legacy Nextdoor’s operations are the only ongoing operations of Nextdoor.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Estimates include, but are not limited to, valuation of financial instruments, valuation of common stock through the date of the Reverse Recapitalization, valuation of stock-based awards, revenue recognition, collectability of accounts receivable, valuation of acquired intangible assets and goodwill, useful

lives of intangible assets, useful lives of property and equipment, the incremental borrowing rate applied in lease accounting, income taxes and deferred income tax assets and associated valuation allowances. The Company bases these estimates and assumptions on historical experience and various other assumptions that it considers reasonable. The actual results could differ materially from these estimates.

Foreign Currency

The functional currency of the Company’s international subsidiaries is generally their local currency. The financial statements of these subsidiaries are translated into U.S. dollars using month-end exchange rates for assets and liabilities, historical exchange rates for equity, and average exchange rates for revenue and expenses. Translation gains and losses are recorded in accumulated other comprehensive income (loss) as a component of stockholders’ equity (deficit). Unrealized foreign exchange gains and losses due to the re-measurement of monetary assets and liabilities denominated in non-functional currencies and realized foreign exchange gains and losses on foreign exchange transactions are recorded in other income (expense), net in the consolidated statements of operations.

Cash and Cash Equivalents

Cash and cash equivalents consist of highly liquid investments with insignificant interest rate risk and original maturities of three months or less at the time of purchase. Cash and cash equivalents include demand deposits, money market funds, corporate bonds, and commercial paper. Interest is accrued as earned. Cash and cash equivalents are recorded at cost, which approximates fair value.

Marketable Securities

The Company’s marketable securities are comprised of certificates of deposit, commercial paper, corporate bonds, U.S. Treasury securities, U.S. agency bonds, and asset-backed securities. The Company determines the appropriate classification of its investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its investments as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, the Company classifies its investments, including securities with stated maturities beyond 12 months, within current assets on the consolidated balance sheets.

Available-for-sale securities are recorded at fair value each reporting period. Unrealized gains and losses on these investments are reported as a separate component of accumulated other comprehensive income (loss) on the consolidated balance sheets until realized. Interest income is reported within interest income in the consolidated statements of operations. The Company periodically evaluates its marketable securities to assess whether those with unrealized loss positions are other-than-temporarily impaired. The Company considers various factors in determining whether to recognize an impairment charge, including the length of time the investment has been in a loss position, the extent to which the fair value is less than the Company’s cost basis, the financial condition and near-term prospects of the investee. Realized gains and losses are determined based on the specific identification method and are reported in other income (expense), net in the consolidated statements of operations. If the Company determines that the decline in an investment’s fair value is other than temporary, the difference is recognized as an impairment loss in the consolidated statements of operations. The Company did not consider any of its investments to be other-than-temporarily impaired for the years ended December 31, 2022 and 2021.

Fair Value Measurements

The Company accounts for certain assets and liabilities at fair value, which is the expected exchange price that would be received for an asset or an exit price paid to transfer a liability in an orderly transaction between market participants on the measurement date. Assets and liabilities measured at fair value are classified into the following categories based on the degree to which the inputs the Company uses to measure the fair values are observable in active markets. The Company uses the most observable inputs available when measuring fair value.

•Level 1: Observable inputs such as unadjusted quoted prices for identical assets or liabilities in active markets;

•Level 2: Observable inputs such as quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in inactive markets, or inputs that are derived principally from or corroborated by observable market data or other means; and

•Level 3: Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities.

Accounts Receivable and Allowance for Doubtful Accounts

The Company records accounts receivable at the original invoiced amount. The Company maintains an allowance for doubtful accounts for any receivables it may be unable to collect and reduces the allowance when it determines that it will be unable to collect specific receivables. The Company determines the allowance based on its receivables’ age, the customers’ credit quality, and current economic conditions, among other factors that may affect the customers’ ability to pay.

Property and Equipment

Property and equipment are recorded at cost, less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets as follows:


			Estimated Useful Life
Computer equipment and software			3 years
Furniture and fixtures			5 years
Leasehold improvements			Shorter of the estimated useful life of 5 years or the lease term

Maintenance and repair costs are expensed as incurred.

Capitalized Internal-use Software

The Company capitalizes internal-use software costs when preliminary development efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed, and the software will be used as intended. Costs related to preliminary project activities and post-implementation activities are expensed as incurred and costs related to the application development stage are capitalized. Capitalized costs are recorded as part of property and equipment, net. The capitalized costs related to internal-use software are amortized on a straight-line basis over an estimated useful life of two to three years. Management evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets. The Company capitalized $0.3 million of internal-use software costs for the year ended December 31, 2022. The Company did not capitalize any internal-use software costs for the year ended December 31, 2021.

Goodwill and Other Acquired Intangible Assets

Goodwill represents the excess of the purchase price over the fair value of net assets acquired in connection with business combinations accounted for using the acquisition method of accounting. Goodwill is not amortized, but is tested for impairment at least annually, in the fourth quarter, or whenever events or changes in circumstances indicate that goodwill might be impaired. For all periods presented the Company had one reporting unit. The Company’s test for goodwill impairment starts with a qualitative assessment to determine whether it is necessary to perform the quantitative goodwill impairment test. If the Company determines, based on the qualitative factors, that the fair value of the reporting unit is more likely than not to be less than the carrying amount, then a quantitative goodwill impairment test is required. There was no impairment of goodwill recorded for the periods presented.

Intangible assets consist of identifiable intangible assets, including customer relationships and developed technology, resulting from the Company’s acquisitions. Acquired intangible assets are recorded at cost, net of accumulated amortization. Intangible assets are amortized on a straight-line basis over their estimated useful lives. Amortization costs are recorded in sales and marketing in the consolidated statements of operations.

Impairment of Long-Lived Assets

Property and equipment and other long-lived assets, such as finite-lived intangible assets, subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Recoverability of these assets is measured by a comparison of the carrying amounts to the future undiscounted cash flows the assets are expected to generate. If impairment is indicated, an impairment loss is recognized as the amount by which the carrying amount exceeds the fair value. No impairment was recorded for long-lived assets for the periods presented.

Leases

Results and disclosure requirements for all periods presented are presented under ASU 2016-02, Leases (“Topic 842”).

The Company has various lease agreements related to real estate that are all classified as operating leases. At the inception of the Company’s contracts it determines if the contract is or contains a lease. A contract is or contains a lease if it conveys the right to control the use of an identified asset for a period of time in exchange for consideration. The Company has elected not to separate the lease and non-lease components within the contract. For leases that have greater than a 12-month lease term, right-of-use (“ROU”) assets and operating lease liabilities are recognized on the consolidated balance sheets at commencement date based on the present value of remaining fixed lease payments.

Certain of the Company’s leases include options to extend the lease, with renewal terms that can extend the lease term from one month to five years. If the Company is reasonably certain to exercise an option to extend a lease, the extension period is included as part of the ROU asset and the operating lease liability.

When the discount rate implicit in the lease cannot be readily determined, the Company uses its incremental borrowing rate at lease commencement in order to discount lease payments to present value for purposes of performing lease classification tests and measuring the lease liability. The Company’s incremental borrowing rate represents the rate of interest the Company would have to pay to borrow, on a collateralized basis, over a similar term an amount equal to the lease payments in a similar economic environment.

The operating lease ROU asset also includes accrued lease expense resulting from the straight-line accounting under prior accounting methods, which is now being amortized over the remaining life of the lease.

The Company’s lease payments are largely fixed. Variable lease payments exist in circumstances such as payments for property tax, insurance, and common area maintenance. Variable lease payments are recognized in operating expense in the period in which the obligation for those payments are incurred. Certain of the Company’s leases include an option to early terminate the lease. The Company’s leases may contain early termination options which may result in an early termination fee. The Company early terminated one of its leases in October 2020 and incurred an early termination fee of $0.1 million. The Company has a significant lease for its headquarters in San Francisco, California, which does not include an option to early terminate. The first portion of the lease commenced in June 2020 and the second portion of the lease commenced in January 2021.

For the Company’s leases, it has elected to not apply the recognition requirements to leases of twelve months or less. These leases are expensed on a straight-line basis and no ROU asset or operating lease liability is recorded.

Concentration of Credit and Customer Risks

Financial instruments that are exposed to concentrations of credit risk consist principally of cash and cash equivalents, marketable securities and accounts receivable. The Company maintains cash and cash equivalents and marketable securities with domestic and foreign financial institutions and at times may exceed federally insured limits. The Company performs periodic evaluations of the relative credit standing of these institutions. The Company maintains investments in U.S. government debt and agency securities, corporate debt securities, and commercial paper that carry high credit ratings and accordingly, minimal credit risk exists with respect to these balances.

One customer accounted for 24% of the Company’s accounts receivable as of December 31, 2022. One customer accounted for 13% of the Company’s accounts receivable as of December 31, 2021. No customer accounted for 10% or more of the Company’s total revenue for the years ended December 31, 2022, 2021 and 2020.

Revenue Recognition

The Company generates a majority of its revenue from the delivery of advertising services.

The Company determines revenue recognition through the following steps:

(1)Identification of the contract, or contracts, with a customer;

(2)Identification of the performance obligations in the contract;

(3)Determination of the transaction price;

(4)Allocation of the transaction price to the performance obligations in the contract; and

(5)Recognition of revenue when, or as, the Company satisfies a performance obligation.

The Company recognizes advertising revenue after satisfying its contractual performance obligation, which, for the majority of its advertising arrangements, is when an advertising impression is displayed to users. None of the Company’s arrangements contain minimum impression guarantees. The Company typically bills advertisers on a monthly basis and the payment terms vary by customer

type and location. The Company has other advertising arrangements which are typically fixed-fee arrangements and revenue is recognized on a straight-line basis over the non-cancellable contractual term of the agreement, generally beginning on the date its service is made available to the customer.

Deferred Revenue

In certain advertising arrangements the Company requires payment upfront from its customers. The Company records deferred revenue when it collects cash from customers in advance of revenue recognition. As of December 31, 2022 and 2021, deferred revenue was $6.0 million and $3.4 million, respectively, and included within accrued expenses and other current liabilities on the consolidated balance sheets. For the years ended December 31, 2022 and 2021, revenue recognized from deferred revenue at the beginning of each year was $2.9 million and $2.5 million, respectively.

Practical Expedients and Exemptions

The Company expenses sales commissions as incurred because the expected period of benefit is less than one year. These costs are recorded within sales and marketing expenses in the consolidated statements of operations.

The Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which it recognizes revenue at the amount to which it has the right to invoice for services performed.

Cost of Revenue

Cost of revenue consists primarily of expenses associated with the delivery of the Company’s revenue generating activities, including third-party costs of hosting its platform and allocated personnel-related costs, including salaries, benefits and stock-based compensation for employees engaged in development of its revenue generating products. Cost of revenue also includes third-party costs associated with delivering and supporting its advertising products and credit card transaction fees related to processing customer transactions.

Research and Development

Research and development expenses consist primarily of personnel-related costs, including salaries, benefits and stock-based compensation for its employees engaged in research and development, as well as costs for consultants, contractors and third-party software. In addition, allocated overhead costs, such as facilities, information technology, and depreciation are included in research and development expenses.

Sales and Marketing

Sales and marketing expenses consist primarily of personnel-related costs and other costs which include salaries, commissions, benefits, and stock-based compensation for employees engaged in sales and marketing activities as well as other costs including third-party consulting, public relations, allocated overhead costs, and amortization of acquired intangible assets. Sales and marketing expenses also include brand and performance marketing for both user and small and mid-sized customer acquisition, and neighbor services, which includes personnel-related costs for the Company's neighbor support team, its outsourced neighbor support function, and verification costs.

General and Administrative

General and administrative expenses consist primarily of personnel-related costs, including salaries, benefits, and stock-based compensation, for certain executives, finance, legal, information technology, human resources, and other administrative employees. In addition, general and administrative expenses include fees and costs for professional services, including consulting, third-party legal and accounting services, and allocated overhead costs.

Advertising Costs

Advertising costs which consist primarily of brand and performance marketing are expensed as incurred and are included in sales and marketing expense in the consolidated statements of operations. Total advertising costs incurred were $33.6 million, $37.5 million, and $23.7 million for the years ended December 31, 2022, 2021 and 2020, respectively.

Income Taxes

The Company accounts for income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the consolidated financial statements or in the Company’s tax returns. Deferred income taxes are recognized for differences between financial reporting and tax bases of assets and liabilities at the enacted statutory tax rates in effect for the years in which the temporary differences are expected to reverse. Management makes an assessment of the likelihood that the resulting deferred tax assets will be realized. A valuation allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized. Due to the Company’s historical operating performance and the recorded cumulative net losses in prior fiscal periods, the U.S. net deferred tax assets have been fully offset by a valuation allowance.

The Company operates in various tax jurisdictions which are subject to audit by various tax authorities. The Company recognizes a tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such positions are then measured based on the largest benefit that has a greater than 50% cumulative likelihood of being realized upon settlement. The Company recognizes interest and penalties related to unrecognized tax benefits in the income tax provision in the consolidated statements of operations.

Net Loss Per Share Attributable to Common Stockholders

The Company presents net loss per share attributable to common stockholders in conformity with the two-class method required for multiple classes of common stock and participating securities. Under the two-class method, net loss is attributed to common stockholders and participating securities based on their participation rights. The rights, including the liquidation and dividend rights, of the Class A common stock and Class B common stock are substantially identical, other than voting rights. Accordingly, the Class A common stock and Class B common stock share proportionately in the Company’s net losses. The Company considers its redeemable convertible preferred stock (prior to the Reverse Recapitalization), early exercised stock options, and unvested restricted stock to be participating securities and contractually entitles the holders of such shares to participate in dividends but does not contractually obligate the holders of such shares to participate in the Company’s losses. As such, net losses for the periods presented were not allocated to these securities.

The Company computes basic net loss per share attributable to common stockholders by dividing the net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period, adjusted for outstanding shares that are subject to repurchase. Diluted net loss per share attributable to common stockholders is computed by giving effect to all potentially dilutive securities outstanding for the period. For periods in which the Company reports net losses, diluted net loss per share attributable to common stockholders is the same as basic net loss per share attributable to common stockholders, because all potentially dilutive securities are anti-dilutive.

Stock-Based Compensation

Stock-based compensation expense for stock-based awards granted to employees and non-employees is measured based on the grant date fair value of the awards and recognized in the consolidated statements of operations on a straight-line basis over the period during which services are provided in exchange for the award, generally, the vesting period of the award. The grant date fair value of stock options granted is estimated using the Black-Scholes option pricing model. Forfeitures are accounted for as they occur.

Segments

The Company has one reportable and operating segment. The Company’s chief operating decision maker is its Chief Executive Officer (“CEO”), who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance, and allocating resources. See Note 13 - Geographical Information for more details on the Company’s revenue and long-lived assets by jurisdiction.

Recently Adopted Accounting Pronouncements

In December 2019, the FASB issued ASU 2019-12, Income Taxes – Topic 740 – Simplifying the Accounting for Income Taxes, which simplifies the accounting for income taxes by removing certain exceptions to the general principals in Topic 740. The amendments also improve consistent application of and simplify GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The Company adopted this standard as of January 1, 2022, and the adoption did not have a material impact on the Company’s consolidated financial statements.

Recently Issued Accounting Pronouncements Not Yet Adopted

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and has since issued various amendments including ASU 2018-19, ASU 2019-04, and ASU 2019-05. The guidance and related amendments modify the accounting for credit losses for most financial assets and require the use of an expected loss model, replacing the currently used incurred loss method. Under this model, entities will be required to estimate the lifetime expected credit loss on such instruments and record an allowance to offset the amortized cost basis of the financial asset, resulting in a net presentation of the amount expected to be collected on the financial asset. This guidance became effective for the Company beginning January 1, 2023. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements and related disclosures.

Redeemable Convertible Preferred Stock, Common Stock, and Stockholders’ Equity (Deficit)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Redeemable Convertible Preferred Stock, Common Stock, and Stockholders’ Equity (Deficit)

Legacy Nextdoor Redeemable Convertible Preferred Stock

Upon the completion of the Reverse Recapitalization on November 5, 2021, all outstanding shares of Legacy Nextdoor redeemable convertible preferred stock converted into Legacy Nextdoor common stock on a one-to-one basis, which were then converted into 190,477,421 shares of Nextdoor Class B common stock as a result of the Reverse Recapitalization, using the Exchange Ratio of 3.1057.

Preferred Stock

In connection with the Reverse Recapitalization, the Company's amended and restated certificate of incorporation became effective, which authorized the issuance of 50,000,000 shares of preferred stock with a par value of $0.0001 per share with such designations, voting, and other rights and preferences as may be determined from time to time by the Company's Board of Directors. As of December 31, 2022 and 2021, there were no shares of preferred stock issued or outstanding.

Common Stock

The Company was authorized to issue 2,500,000,000 shares of Class A common stock and 500,000,000 shares of Class B common stock as of December 31, 2022 and 2021. The rights, including the liquidation and dividend rights, of the Class A common stock and Class B common stock are substantially identical, other than voting and conversion rights. The holder of each share of Class A common stock is entitled to one vote per share and the holder of each share of Class B common stock is entitled to ten votes per share. Shares of Class B common stock are convertible into an equivalent number of shares of Class A common stock at the option of the holder or upon certain events upon the terms and conditions described in the Company’s amended and restated certificate of incorporation. Class A common stock and Class B common stock are referred to, collectively, as common stock throughout the notes to these consolidated financial statements, unless otherwise indicated. Shares of common stock reserved for future issuance on an as-converted basis were as follows (in thousands):


	As of December 31,
	2022	2021
Stock options outstanding	55,388	58,278
Unvested restricted stock units (RSUs)	21,986	2,511
Shares reserved for future award issuances	50,852	77,924
Total	128,226	138,713

Common Stock Subject to Repurchase

Certain stock option grant agreements permit exercise prior to vesting. Upon termination of service of an employee, the Company has the right to repurchase any unvested, but issued, common stock at the original purchase price. The consideration received for an exercise of an option is accounted for as a deposit of the exercise price and is recorded as a liability. Upon vesting of the shares pursuant to the grant agreements, the shares and related liability are reclassified into stockholders’ equity (deficit). As of December 31, 2022 and 2021, the Company had $0.2 million and $0.7 million recorded in accrued expenses and other current liabilities related to 101,593 and 421,594 unvested shares of common stock subject to repurchase, respectively.

Restricted Stock Subject to Repurchase

In 2018, an executive of the Company purchased 15,408,183 shares of restricted stock, subject to time-based service requirements, which vest over a forty-eight month period. The shares issued upon the purchase of restricted stock are considered to be legally issued and outstanding on the date of purchase and the executive has full voting rights. Upon termination of service, the Company may repurchase unvested shares acquired at a price equal to the price per share paid upon the exercise. Upon vesting of the shares pursuant

to the grant agreements, the shares and related liability are reclassified into stockholders’ equity (deficit). As of December 31, 2022, all shares of this restricted stock were fully vested with no balance remaining in deposits. As of December 31, 2021, the Company had $4.8 million recorded in deposits related to 3,210,037 unvested shares of common stock subject to repurchase. For the years ended December 31, 2022, 2021 and 2020, the Company recorded stock-based compensation expense of $3.7 million, $4.6 million, and $4.6 million, respectively, related to this restricted stock.

Equity Incentive Plans

2021 Equity Incentive Plan

In November 2021, the Company’s Board of Directors and stockholders approved the Company’s 2021 Equity Incentive Plan (the “2021 Plan”) as a successor to the 2018 Equity Incentive Plan (the “2018 Plan”), with the purpose of granting stock-based awards to employees, directors, officers, and consultants, including stock options, restricted stock awards, and RSUs.

The Company initially reserved for issuance under the 2021 Plan (a) 46,008,885 shares of Class A common stock, plus (b) shares that are subject to issuance upon exercise of options granted under the 2018 Plan prior to the Closing but which, after the Closing, cease to be subject to the option for any reason other than exercise of the option, (c) shares that are subject to awards granted under the 2018 Plan prior to the Closing that, after the Closing, are forfeited or are repurchased by the Company at the original issue price, (d) shares that are subject to awards granted under the 2018 Plan prior to the Closing that, after the Closing, otherwise terminate without such shares being issued, and (e) shares that, after the Closing, are used to pay the exercise price of a stock option issued under the 2018 Plan prior to the Closing or are withheld to satisfy the tax withholding obligations related to any award issued under the 2018 Plan prior to the Closing. The number of shares available for grant and issuance under the 2021 Plan will increase automatically on January 1 of each of 2022 through 2031 by the number of shares equal to the lesser of (i) five percent (5%) of the number of shares (rounded down to the nearest whole share) of Class A common stock and Class B common stock issued and outstanding on each December 31 immediately prior to the date of increase, or (ii) such number of shares determined by the Company’s Board of Directors.

2021 Employee Stock Purchase Plan

In November 2021, the Company’s Board of Directors and stockholders approved the Company’s 2021 Employee Stock Purchase Plan (the “2021 ESPP”). Over a series of offering periods, each of which may consist of one or more purchase periods, eligible employees will be offered the option to purchase shares of Class A common stock at 85% of the lesser of the fair market value of Class A common stock on (i) the first business day of the applicable offering period and (ii) the date of purchase. Under the 2021 ESPP, the Company initially reserved 8,901,159 shares of Class A common stock for issuance, and the aggregate number of shares reserved will increase automatically on January 1 of each of 2022 through 2031 by the number of shares equal to the lesser of (i) one percent (1%) of the total number of outstanding shares of Class A common stock and Class B common stock as of the immediately preceding December 31, or (ii) a number of shares as may be determined by the Company’s Board of Directors. The aggregate number of shares issued over the term of the 2021 ESPP, subject to adjustments for stock-splits, recapitalizations, or similar events, may not exceed 89,011,590 shares. In February 2022, the Company commenced its first offering period under the 2021 ESPP. During the year ended December 31, 2022, 551,765 shares of Class A common stock were purchased under the 2021 ESPP.

Share Repurchase Program

On May 31, 2022, the Company’s Board of Directors authorized and approved a share repurchase program (the “Share Repurchase Program”) to repurchase up to $100.0 million in aggregate of the Company’s Class A common stock, with the authorization to expire on June 30, 2024. Repurchases of Class A common stock under the Share Repurchase Program may be made from time to time, on the open market, in privately negotiated transactions or by other methods, and in accordance with the limitations set forth in Rule 10b-18 promulgated under the Securities Exchange Act of 1934, as amended, and other applicable legal requirements. The timing of any repurchases will depend on market conditions and other investment opportunities, and will be made at the Company’s discretion. The Company currently anticipates that the Share Repurchase Program will extend through June 30, 2024, or such shorter period if $100.0 million in aggregate of shares of the Company’s Class A common stock have been repurchased. The Share Repurchase Program does not obligate the Company to repurchase any dollar amount or number of shares, and the program may be extended, modified, suspended, or discontinued at any time.

When the Company repurchases shares under the Share Repurchase Program, it reduces the common stock component of stockholders’ equity by the par value of the repurchased shares. The excess of the repurchase price over par value is recorded to additional paid-in capital. All repurchased shares are retired and become authorized and unissued shares.

During the year ended December 31, 2022, the Company repurchased and retired 23,251,703 shares of Class A common stock at an average purchase price of $3.32 per share for an aggregate repurchase price of $77.2 million. As of December 31, 2022, the Company had $22.8 million available for future share repurchases under the Share Repurchase Program.

Stock Options and RSUs

The Company may grant options to acquire shares of Class A common stock to employees, directors, officers, and consultants at a price not less than the fair market value of the shares at the date of grant. Options granted to a person who, at the time of the grant, owns more than 10% of the voting power of all classes of stock shall be at no less than 110% of the fair market value and expire five years from the date of grant. All other options generally have a contractual term of ten years. Options granted generally vest on a monthly basis over three to four years. RSUs granted for Class A common stock generally vest on a quarterly basis over three to four years.

A summary of the Company’s stock option activity for the year ended December 31, 2022 and related information is as follows (in thousands, except per share data):


	Number of Options	Weighted- Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding at December 31, 2021	58,278	$	2.35	8.1	$	322,799
Options granted	11,914	$	4.42
Options exercised	(6,182)	$	2.02
Options forfeited or expired	(8,622)	$	3.38
Outstanding at December 31, 2022	55,388	$	2.67	7.5	$	10,552
Exercisable at December 31, 2022	29,223	$	2.04	6.2	$	10,457
Vested or expected to vest at December 31, 2022	55,490	$	2.67	7.5	$	10,591

The intrinsic value is calculated as the difference between the exercise price of the underlying common stock option award and the fair value of the Company’s common stock as of the respective balance sheet date. The weighted average grant date fair value of options granted was $2.47 per share, $3.63 per share and $2.40 per share during the years ended December 31, 2022, 2021 and 2020, respectively.

The intrinsic value of the options exercised was $14.0 million, $31.9 million and $9.8 million for the years ended December 31, 2022, 2021 and 2020, respectively.

The Company did not issue any grants to non-employees during the year ended December 31, 2022. The Company granted 19,639 options to non-employees during the year ended December 31, 2021.

A summary of the Company’s RSU activity for the year ended December 31, 2022 and related information is as follows (in thousands, except per share data):


	Number of Shares	Weighted Average Grant Date Fair Value
Unvested at December 31, 2021	2,511	$	8.74
RSUs granted	26,514	$	4.14
RSUs vested	(4,520)	$	5.05
RSUs forfeited	(2,519)	$	6.16
Unvested at December 31, 2022	21,986	$	4.25

Valuation Assumptions

The Company’s use of the Black-Scholes option-pricing model to estimate the fair value of stock options granted requires the input of highly subjective assumptions. These assumptions were estimated as follows:

Fair value of the underlying common stock – Prior to the Reverse Recapitalization, the Board of Directors considered numerous objective and subjective factors to determine the fair value of the Company’s common stock including, but not limited to:

(i) the results of contemporaneous third-party valuations of the Company’s common stock; (ii) the prices, rights, preferences, and privileges of the Company’s redeemable convertible preferred stock relative to those of its common stock; (iii) the lack of marketability of the Company’s common stock; (iv) actual operating and financial results; (v) current business conditions and projections; (vi) the likelihood of achieving a liquidity event, such as an initial public offering, merger, or acquisition of the Company, given prevailing market conditions; (vii) transactions involving the Company’s shares; (viii) the history and nature of its business, industry trends and competitive environment; and (iv) general economic outlook. After the Reverse Recapitalization, the fair value of the underlying common stock is determined by the closing price, on the date of grant, of the Company’s Class A common stock, which is traded on the New York Stock Exchange.

Expected volatility – Expected volatility is a measure of the amount by which the stock price is expected to fluctuate. Since the Company does not have sufficient trading history of its common stock, it estimates the expected volatility of its stock options at their grant date by taking the weighted average historical volatility of a group of comparable publicly traded companies over a period equal to the expected term of the options.

Expected term – The Company determines the expected term based on the average period the stock options are expected to remain outstanding using the simplified method, calculated as the midpoint of the stock options’ vesting term and contractual expiration period, as the Company does not have sufficient historical information to develop reasonable expectations about future exercise patterns and post-vesting employment termination behavior.

Risk-free rate – The Company uses the U.S. Treasury yield for its risk-free interest rate that corresponds with the expected term.

Expected dividend yield – The Company utilizes a dividend yield of zero, as it does not currently issue dividends and does not expect to in the future.

The following assumptions were used to calculate the fair value of employee and non-employee stock option grants made during the following periods:


	Year Ended December 31,
	2022	2021	2020
Expected volatility	53.9%- 61.2%	53.7% - 54.5%	48.8% -53.4%
Expected term (years)	6.1	6.3	6.0
Risk-free interest rate	3.1%	1.1%	0.6%
Expected dividend yield	—	—	—
Fair value of common stock per share	$1.99 - $6.06	$4.92 - $6.83	$3.89 - $4.23

Stock-Based Compensation

The Company recorded stock-based compensation expense in the consolidated statements of operations as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Cost of revenue	$	2,627	$	1,466	$	905
Research and development	35,567		20,690		10,235
Sales and marketing	10,160		6,388		3,403
General and administrative	16,066		18,970		8,065
Total	$	64,420	$	47,514	$	22,608

As of December 31, 2022, there was $165.4 million of unrecognized stock-based compensation expense, which is expected to be recognized over a weighted average period of 2.2 years.

Net Loss Per Share Attributable to Common Stockholders - Potentially Dilutive Securities Outstanding (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	80,049	64,602	245,409
Redeemable convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	0	0	190,477
Outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	55,388	58,278	46,973
Unvested RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	21,986	2,511	0
Unvested early exercised stock options subject to repurchase
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	102	422	693
Unvested restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	0	3,210	7,062
Shares issuable pursuant to the employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	2,566	0	0
Contingently issuable shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	7	181	204

Summary of Significant Accounting Policies - Narrative (Details)	1 Months Ended	12 Months Ended
	Oct. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) member unit segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Concentration Risk [Line Items]
Number of members of Board of Directors \| member		10
Capitalized software costs		$ 300,000	$ 0
Number of reporting units \| unit		1
Goodwill impairment		$ 0
Long-lived asset impairment		0
Termination fee	$ 100,000
Deferred revenue		6,020,000	3,388,000
Revenue recognized from contract with customer		2,900,000	2,500,000
Advertising expense		$ 33,600,000	$ 37,500,000	$ 23,700,000
Number of reportable segments \| segment		1
Number of operating segments \| segment		1
Customer Concentration Risk \| Accounts Receivable \| One Customer
Concentration Risk [Line Items]
Concentration risk (as a percent)		24.00%	13.00%
Minimum
Concentration Risk [Line Items]
Lessee, operating lease, renewal term		1 month
Maximum
Concentration Risk [Line Items]
Lessee, operating lease, renewal term		5 years
Capitalized internal-use software \| Minimum
Concentration Risk [Line Items]
Property and equipment, useful life		2 years
Capitalized internal-use software \| Maximum
Concentration Risk [Line Items]
Property and equipment, useful life		3 years

Reverse Recapitalization - Narrative (Details) $ in Thousands			12 Months Ended
	Nov. 05, 2021 USD ($) shares	Jul. 06, 2021 USD ($) shares	Dec. 31, 2022 USD ($) vote shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 shares
Business Acquisition [Line Items]
Redeemable convertible preferred stock issued (in shares)			0	0
Redeemable convertible preferred stock outstanding (in shares)			0	0	190,477,000	190,477,000
Common stock outstanding (in shares)	382,957,639
Recapitalization exchange ratio	3.1057
Stock options outstanding (in shares)			55,388,000	58,278,000
Shares reserved for issuance (in shares)			128,226,000	138,713,000
Sale of stock, consideration received on transaction \| $		$ 270,000
Proceeds from the Reverse Recapitalization \| $	$ 628,500		$ 0	$ 628,489	$ 0
Cash acquired through reverse recapitalization, trust account \| $	416,400
Cash acquired through reverse recapitalization, operating cash account \| $	200
Proceeds from private placement \| $	270,000
Amount paid to redeem public shares \| $			$ 77,232	$ 0	$ 0
Reverse recapitalization costs incurred \| $	5,700
KVSB
Business Acquisition [Line Items]
Reverse recapitalization costs incurred \| $	$ 45,900
Common Stock
Business Acquisition [Line Items]
Conversion ratio (in shares)	1
Legacy Nextdoor
Business Acquisition [Line Items]
Common stock outstanding (in shares)	97,886,321
Common stock issued (in shares)	97,886,321
Stock options outstanding (in shares)	19,196,313
Legacy Nextdoor \| Common Stock
Business Acquisition [Line Items]
Convertible preferred stock converted (in shares)	61,331,815
Legacy Nextdoor \| Pixel Labs, Inc
Business Acquisition [Line Items]
Contingent equity consideration (in shares)	58,135
Legacy Nextdoor \| Unvested RSUs
Business Acquisition [Line Items]
Unvested restricted stock units (RSUs)	866,687
Redeemable convertible preferred stock
Business Acquisition [Line Items]
Conversion of stock (in shares)	190,477,421
Conversion ratio (in shares)	1
Redeemable convertible preferred stock \| Legacy Nextdoor
Business Acquisition [Line Items]
Redeemable convertible preferred stock issued (in shares)	61,331,815
Redeemable convertible preferred stock outstanding (in shares)	61,331,815
Class B Common Stock
Business Acquisition [Line Items]
Common stock outstanding (in shares)	304,003,976		218,029,000	304,701,000
Common stock issued (in shares)	304,003,976		218,029,000	304,701,000
Stock options outstanding (in shares)	59,616,898
Number of votes per share \| vote			10
Class B Common Stock \| KVSB
Business Acquisition [Line Items]
Conversion of stock (in shares)	5,000,000
Stock issued in reverse recapitalization (in shares)	7,347,249
Class B Common Stock \| Common Stock
Business Acquisition [Line Items]
Common stock outstanding (in shares)			218,029,000	304,701,000	103,777,000	97,777,000
Class B Common Stock \| Pixel Labs, Inc
Business Acquisition [Line Items]
Shares reserved for issuance (in shares)	180,549
Class B Common Stock \| Unvested RSUs
Business Acquisition [Line Items]
Unvested restricted stock units (RSUs)	2,691,577
Class B Common Stock \| Share-based payment arrangement
Business Acquisition [Line Items]
Shares reserved for issuance (in shares)	62,308,475
Class B Common Stock \| Legacy Nextdoor
Business Acquisition [Line Items]
Common stock outstanding (in shares)	36,554,506
Class A Common Stock
Business Acquisition [Line Items]
Common stock outstanding (in shares)	78,953,663		153,693,000	78,954,000
Common stock issued (in shares)	78,953,663		153,693,000	78,954,000
Conversion of stock (in shares)	113,526,555
Sale of stock, number of shares issued in transaction (in shares)		27,000,000
Number of votes per share \| vote			1
Class A Common Stock \| Legacy Nextdoor
Business Acquisition [Line Items]
Sale of stock, number of shares issued in transaction (in shares)		4,500,000
Class A Common Stock \| KVSB
Business Acquisition [Line Items]
Conversion of stock (in shares)	40,412,372
Stock redeemed during period (in shares)	1,222,040
Sale of stock, number of shares issued in transaction (in shares)		750,000
Amount paid to redeem public shares \| $	$ 12,200
Class A Common Stock \| Common Stock
Business Acquisition [Line Items]
Common stock outstanding (in shares)			153,693,000	78,954,000	0	0
Stock redeemed during period (in shares)			23,252,000
Class A Common Stock \| Private Placement \| KVSB
Business Acquisition [Line Items]
Conversion of stock (in shares)	1,132,688
Class A Common Stock \| Chief Executive Officer And President
Business Acquisition [Line Items]
Sale of stock, number of shares issued in transaction (in shares)		500,000
Class A Common Stock \| Conversion of KVSB Class B Common Stock
Business Acquisition [Line Items]
Stock issued in reverse recapitalization (in shares)	7,347,249
Class A Common Stock \| Conversion of KVSB Class K Common Stock
Business Acquisition [Line Items]
Stock issued in reverse recapitalization (in shares)	3,061,354
Common Class K \| KVSB
Business Acquisition [Line Items]
Conversion of stock (in shares)	5,000,000
Stock issued in reverse recapitalization (in shares)	3,061,354

Redeemable Convertible Preferred Stock, Common Stock, and Stockholders’ Equity (Deficit) (Tables)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Schedule of Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance on an as-converted basis were as follows (in thousands):


	As of December 31,
	2022	2021
Stock options outstanding	55,388	58,278
Unvested restricted stock units (RSUs)	21,986	2,511
Shares reserved for future award issuances	50,852	77,924
Total	128,226	138,713

Summary of Stock Option Activity

A summary of the Company’s stock option activity for the year ended December 31, 2022 and related information is as follows (in thousands, except per share data):


	Number of Options	Weighted- Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding at December 31, 2021	58,278	$	2.35	8.1	$	322,799
Options granted	11,914	$	4.42
Options exercised	(6,182)	$	2.02
Options forfeited or expired	(8,622)	$	3.38
Outstanding at December 31, 2022	55,388	$	2.67	7.5	$	10,552
Exercisable at December 31, 2022	29,223	$	2.04	6.2	$	10,457
Vested or expected to vest at December 31, 2022	55,490	$	2.67	7.5	$	10,591

Schedule of Restricted Stock Unit Activity

A summary of the Company’s RSU activity for the year ended December 31, 2022 and related information is as follows (in thousands, except per share data):


	Number of Shares	Weighted Average Grant Date Fair Value
Unvested at December 31, 2021	2,511	$	8.74
RSUs granted	26,514	$	4.14
RSUs vested	(4,520)	$	5.05
RSUs forfeited	(2,519)	$	6.16
Unvested at December 31, 2022	21,986	$	4.25

Schedule of Assumptions Used to Calculate Fair Value of Stock Option Grants

The following assumptions were used to calculate the fair value of employee and non-employee stock option grants made during the following periods:


	Year Ended December 31,
	2022	2021	2020
Expected volatility	53.9%- 61.2%	53.7% - 54.5%	48.8% -53.4%
Expected term (years)	6.1	6.3	6.0
Risk-free interest rate	3.1%	1.1%	0.6%
Expected dividend yield	—	—	—
Fair value of common stock per share	$1.99 - $6.06	$4.92 - $6.83	$3.89 - $4.23

Schedule of Stock-based Compensation Expense

The Company recorded stock-based compensation expense in the consolidated statements of operations as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Cost of revenue	$	2,627	$	1,466	$	905
Research and development	35,567		20,690		10,235
Sales and marketing	10,160		6,388		3,403
General and administrative	16,066		18,970		8,065
Total	$	64,420	$	47,514	$	22,608

Redeemable Convertible Preferred Stock, Common Stock, and Stockholders’ Equity (Deficit) - Shares Reserved for Future Issuance (Details) - shares shares in Thousands	Dec. 31, 2022	Dec. 31, 2021
Equity [Abstract]
Stock options outstanding (in shares)	55,388	58,278
Unvested restricted stock units (RSUs) (in shares)	21,986	2,511
Shares reserved for future award issuances (in shares)	50,852	77,924
Total (in shares)	128,226	138,713

Cash Equivalents and Marketable Securities

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Cash Equivalents and Marketable Securities

The amortized costs, unrealized gains and losses, and estimated fair values of the Company’s cash equivalents and marketable securities were as follows (in thousands):


	As of December 31, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	20,381	$	—	$	—	$	20,381
Corporate bonds	6,021		3		—		6,024
Commercial paper	9,394		—		(3)		9,391
Total cash equivalents	$	35,796	$	3	$	(3)	$	35,796
Marketable securities:
Certificates of deposit	44,732		9		(191)		44,550
Commercial paper	100,909		27		(92)		100,844
Corporate bonds	280,023		11		(1,980)		278,054
U.S. Treasury securities	41,646		3		(123)		41,526
U.S. Agency bonds	46,366		66		(22)		46,410
Asset-backed securities	16,798		—		(115)		16,683
Total marketable securities	530,474		116		(2,523)		528,067
Total	$	566,270	$	119	$	(2,526)	$	563,863


	As of December 31, 2021
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	474,294	$	—	$	—	$	474,294
Marketable securities:
Commercial paper	83,728		—		—		83,728
Corporate bonds	78,353		24		(14)		78,363
U.S. Treasury securities	15,200		—		(12)		15,188
Asset-backed securities	16,735		—		(15)		16,720
Total marketable securities	194,016		24		(41)		193,999
Total	$	668,310	$	24	$	(41)	$	668,293

All marketable securities are designated as available-for-sale securities as of December 31, 2022 and 2021. No investments had been in an unrealized loss position for greater than 12 months as of December 31, 2022 and 2021.

The following tables present the contractual maturities of the Company’s marketable securities (in thousands):


	As of December 31, 2022
	Amortized Cost		Estimated Fair Value
Due within one year	$	473,133	$	471,378
Due after one to four years	57,341		56,689
Total	$	530,474	$	528,067


	As of December 31, 2021
	Amortized Cost		Estimated Fair Value
Due within one year	$	137,077	$	137,043
Due after one to four years	56,939		56,956
Total	$	194,016	$	193,999

CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at beginning of period (in shares) at Dec. 31, 2019	190,477,000
Balance at beginning of period at Dec. 31, 2019	$ 447,166
Balance at end of period (in shares) at Dec. 31, 2020	190,477,000
Balance at end of period at Dec. 31, 2020	$ 447,166
Balance at beginning of period (in shares) at Dec. 31, 2019				0	97,777,000
Balance at beginning of period at Dec. 31, 2019	(257,296)			$ 0	$ 10	$ 52,439	$ 35	$ (309,780)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, net of repurchases of unvested common stock (in shares)					6,801,000
Issuance of common stock upon exercise of stock options, net of repurchases of unvested common stock	6,367					6,367
Cancellation of restricted stock and unvested common stock issued in connection with acquisition (in shares)					(801,000)
Release of holdback stock in connection with acquisition	291					291
Vesting of early exercised stock options	522					522
Vesting of restricted stock	5,718					5,718
Stock-based compensation	22,608					22,608
Other comprehensive income (loss)	(832)						(832)
Net loss	(75,234)							(75,234)
Balance at end of period (in shares) at Dec. 31, 2020				0	103,777,000
Balance at end of period at Dec. 31, 2020	$ (297,856)			$ 0	$ 10	87,945	(797)	(385,014)
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of redeemable convertible preferred stock into Class B common stock in connection with the Reverse Recapitalization (in shares)	(190,477,000)
Conversion of redeemable convertible preferred stock into Class B common stock in connection with the Reverse Recapitalization	$ (447,166)
Balance at end of period (in shares) at Dec. 31, 2021	0
Balance at end of period at Dec. 31, 2021	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock units (in shares)					101,000
Tax withholdings on release of restricted stock units	(863)					(863)
Conversion of redeemable convertible preferred stock into Class B common stock in connection with the Reverse Recapitalization (in shares)					190,477,000
Conversion of redeemable convertible preferred stock into Class B common stock in connection with the Reverse Recapitalization	447,166				$ 19	447,147
Issuance of common stock upon exercise of stock options, net of repurchases of unvested common stock (in shares)					10,325,000
Issuance of common stock upon exercise of stock options, net of repurchases of unvested common stock	15,334				$ 1	15,333
Issuance of common stock upon the Reverse Recapitalization, net of issuance costs (in shares)				78,954,000
Issuance of common stock upon the Reverse Recapitalization, net of issuance costs	622,588			$ 8		622,580
Issuance of common stock in connection with acquisition (in shares)					21,000
Vesting of early exercised stock options	442					442
Vesting of restricted stock	5,717					5,717
Stock-based compensation	47,514					47,514
Other comprehensive income (loss)	268						268
Net loss	(95,325)							(95,325)
Balance at end of period (in shares) at Dec. 31, 2021		78,954,000	304,701,000	78,954,000	304,701,000
Balance at end of period at Dec. 31, 2021	$ 744,985			$ 8	$ 30	1,225,815	(529)	(480,339)
Balance at end of period (in shares) at Dec. 31, 2022	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock units (in shares)				4,315,000	97,000
Tax withholdings on release of restricted stock units	$ (695)					(695)
Repurchase of common stock (in shares)				(23,252,000)
Repurchase of common stock	(77,232)			$ (2)		(77,230)
Conversion of redeemable convertible preferred stock into Class B common stock in connection with the Reverse Recapitalization (in shares)				89,376,000	(89,376,000)
Conversion of redeemable convertible preferred stock into Class B common stock in connection with the Reverse Recapitalization	$ 0			$ 9	$ (9)
Issuance of common stock upon exercise of stock options, net of repurchases of unvested common stock (in shares)	6,182,000			3,748,000	2,434,000
Issuance of common stock upon exercise of stock options, net of repurchases of unvested common stock	$ 12,463				$ 1	12,462
Issuance of common stock in connection with acquisition (in shares)					173,000
Issuance of common stock under employee stock purchase plan (in shares)				552,000
Issuance of common stock under employee stock purchase plan	1,430					1,430
Vesting of early exercised stock options	516					516
Vesting of restricted stock	4,764					4,764
Stock-based compensation	64,420					64,420
Other comprehensive income (loss)	(1,667)						(1,667)
Net loss	(137,916)							(137,916)
Balance at end of period (in shares) at Dec. 31, 2022		153,693,000	218,029,000	153,693,000	218,029,000
Balance at end of period at Dec. 31, 2022	$ 611,068			$ 15	$ 22	$ 1,231,482	$ (2,196)	$ (618,255)

Cash Equivalents and Marketable Securities - Amortized Cost, Unrealized Gains and Losses, and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Cash equivalents:
Amortized Cost	$ 35,796
Unrealized Gain	3
Unrealized Loss	(3)
Estimated Fair Value	35,796
Marketable securities:
Amortized Cost	530,474	$ 194,016
Unrealized Gain	116	24
Unrealized Loss	(2,523)	(41)
Estimated Fair Value	528,067	193,999
Total
Amortized Cost	566,270	668,310
Unrealized Gain	119	24
Unrealized Loss	(2,526)	(41)
Estimated Fair Value	563,863	668,293
Certificates of deposit
Marketable securities:
Amortized Cost	44,732
Unrealized Gain	9
Unrealized Loss	(191)
Estimated Fair Value	44,550
Commercial paper
Marketable securities:
Amortized Cost	100,909	83,728
Unrealized Gain	27	0
Unrealized Loss	(92)	0
Estimated Fair Value	100,844	83,728
Corporate bonds
Marketable securities:
Amortized Cost	280,023	78,353
Unrealized Gain	11	24
Unrealized Loss	(1,980)	(14)
Estimated Fair Value	278,054	78,363
U.S. Treasury securities
Marketable securities:
Amortized Cost	41,646	15,200
Unrealized Gain	3	0
Unrealized Loss	(123)	(12)
Estimated Fair Value	41,526	15,188
U.S. Agency bonds
Marketable securities:
Amortized Cost	46,366
Unrealized Gain	66
Unrealized Loss	(22)
Estimated Fair Value	46,410
Asset-backed securities
Marketable securities:
Amortized Cost	16,798	16,735
Unrealized Gain	0	0
Unrealized Loss	(115)	(15)
Estimated Fair Value	16,683	16,720
Money market funds
Cash equivalents:
Amortized Cost	20,381	474,294
Estimated Fair Value	20,381	$ 474,294
Corporate bonds
Cash equivalents:
Amortized Cost	6,021
Unrealized Gain	3
Estimated Fair Value	6,024
Commercial paper
Cash equivalents:
Amortized Cost	9,394
Unrealized Loss	(3)
Estimated Fair Value	$ 9,391

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 55,236	$ 521,812
Marketable securities	528,067	193,999
Accounts receivable, net of allowance of $422 and $425 as of December 31, 2022 and 2021, respectively	29,770	29,673
Prepaid expenses and other current assets	12,185	16,259
Total current assets	625,258	761,743
Property and equipment, net	11,818	12,545
Operating lease right-of-use assets	52,555	59,422
Intangible assets, net	3,067	4,835
Goodwill	1,211	1,211
Other assets	5,653	330
Total assets	699,562	840,086
Current liabilities:
Accounts payable	4,535	6,163
Operating lease liabilities, current	7,766	7,131
Liability for unvested restricted stock	0	4,765
Accrued expenses and other current liabilities	22,362	15,444
Total current liabilities	34,663	33,503
Operating lease liabilities, non-current	53,831	61,598
Total liabilities	88,494	95,101
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, $0.0001 par value; 50,000 shares authorized; no shares issued or outstanding as of December 31, 2022 and 2021	0	0
Additional paid-in capital	1,231,482	1,225,815
Accumulated other comprehensive loss	(2,196)	(529)
Accumulated deficit	(618,255)	(480,339)
Total stockholders' equity	611,068	744,985
Total liabilities and stockholders' equity	699,562	840,086
Class A Common Stock
Stockholders' equity:
Common stock	15	8
Class B Common Stock
Stockholders' equity:
Common stock	$ 22	$ 30

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Basis of Presentation

The Merger was accounted for as a reverse recapitalization in accordance with GAAP. This determination was primarily based on the evaluation of the following facts and circumstances:

•Legacy Nextdoor stockholders had a relative majority of the voting power of Nextdoor;

•The Board of Directors of Nextdoor had ten members, and Legacy Nextdoor stockholders had the ability to nominate a majority of the members of the Board of Directors;

•Legacy Nextdoor’s senior management comprised the senior management roles of Nextdoor and were responsible for the day-to-day operations;

•KVSB assumed the Nextdoor Holdings, Inc. name and Legacy Nextdoor’s corporate headquarters; and

Use of Estimates

Foreign Currency

Cash and Cash Equivalents

Marketable Securities

Fair Value Measurements

•Level 1: Observable inputs such as unadjusted quoted prices for identical assets or liabilities in active markets;

•Level 3: Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities.

Accounts Receivable and Allowance for Doubtful Accounts

Property and Equipment


			Estimated Useful Life
Computer equipment and software			3 years
Furniture and fixtures			5 years
Leasehold improvements			Shorter of the estimated useful life of 5 years or the lease term

Maintenance and repair costs are expensed as incurred.

Capitalized Internal-use Software

Capitalized Internal-use SoftwareThe Company capitalizes internal-use software costs when preliminary development efforts are successfully completed, management has authorized and committed project funding, and it is probable that the project will be completed, and the software will be used as intended. Costs related to preliminary project activities and post-implementation activities are expensed as incurred and costs related to the application development stage are capitalized. Capitalized costs are recorded as part of property and equipment, net. The capitalized costs related to internal-use software are amortized on a straight-line basis over an estimated useful life of two to three years. Management evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets.

Goodwill and Other Acquired Intangible Assets

Impairment of Long-Lived Assets

Impairment of Long-Lived AssetsProperty and equipment and other long-lived assets, such as finite-lived intangible assets, subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Recoverability of these assets is measured by a comparison of the carrying amounts to the future undiscounted cash flows the assets are expected to generate. If impairment is indicated, an impairment loss is recognized as the amount by which the carrying amount exceeds the fair value.

Leases

Results and disclosure requirements for all periods presented are presented under ASU 2016-02, Leases (“Topic 842”).

Concentration of Credit and Customer Risks

Revenue Recognition, Deferred Revenue, Practical Expedients and Exemptions, and Cost of Revenue

Revenue Recognition

The Company generates a majority of its revenue from the delivery of advertising services.

The Company determines revenue recognition through the following steps:

(1)Identification of the contract, or contracts, with a customer;

(2)Identification of the performance obligations in the contract;

(3)Determination of the transaction price;

(4)Allocation of the transaction price to the performance obligations in the contract; and

(5)Recognition of revenue when, or as, the Company satisfies a performance obligation.

Deferred Revenue

Practical Expedients and Exemptions

Cost of Revenue

Research and Development

Sales and Marketing, and General and Administrative

Sales and Marketing

General and Administrative

Advertising Costs

Advertising CostsAdvertising costs which consist primarily of brand and performance marketing are expensed as incurred and are included in sales and marketing expense in the consolidated statements of operations.

Income Taxes

Net Loss Per Share Attributable to Common Stockholders

Stock-Based Compensation

Stock-Based CompensationStock-based compensation expense for stock-based awards granted to employees and non-employees is measured based on the grant date fair value of the awards and recognized in the consolidated statements of operations on a straight-line basis over the period during which services are provided in exchange for the award, generally, the vesting period of the award. The grant date fair value of stock options granted is estimated using the Black-Scholes option pricing model. Forfeitures are accounted for as they occur.

Segments

SegmentsThe Company has one reportable and operating segment. The Company’s chief operating decision maker is its Chief Executive Officer (“CEO”), who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance, and allocating resources.

Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements Not Yet Adopted

Recently Adopted Accounting Pronouncements

Recently Issued Accounting Pronouncements Not Yet Adopted

Fair Value Measurements - Schedule of Financial Instruments, Assets, and Liabilities Not Recorded at Fair Value (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Carrying Amount
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Note receivable	$ 5,000,000
Fair Value
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Note receivable	4,646,000	$ 0
Level 1
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Note receivable	0
Level 2
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Note receivable	0
Level 3
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Note receivable	$ 4,646,000

Description of Business	12 Months Ended
Description of Business	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Nextdoor Holdings, Inc. (“Nextdoor” or the “Company”) is headquartered in San Francisco, California. Nextdoor’s purpose is to cultivate a kinder world where everyone has a neighborhood they can rely on. That purpose enables the Company’s mission to be the neighborhood hub for trusted connections and the exchange of helpful information, goods, and services. On November 5, 2021 (the “Closing”), the Company consummated the transactions contemplated by the Agreement and Plan of Merger, dated July 6, 2021, as amended on September 30, 2021 (the “Merger Agreement”), by and among Khosla Ventures Acquisition Co. II (“KVSB”), a special purpose acquisition company, Lorelei Merger Sub Inc. (“Merger Sub”), and Nextdoor, Inc. (“Legacy Nextdoor”), with Legacy Nextdoor surviving as a wholly owned subsidiary of KVSB (the “Merger” and, collectively with the other transactions that occurred in connection with the Merger, including the PIPE Investment (as described in Note 3, the “Reverse Recapitalization”)). In connection with the Closing, KVSB was renamed to Nextdoor Holdings, Inc. Reported results from operations included herein prior to the Reverse Recapitalization are those of Legacy Nextdoor. See Note 3 - Reverse Recapitalization for further details.

Commitments and Contingencies - Schedule of Purchase Commitments (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2023	$ 24,770
2024	10,261
2025	1,258
Thereafter	1,326
Total	$ 37,615

Cover - USD ($) $ in Millions	12 Months Ended
Cover - USD ($) $ in Millions	Dec. 31, 2022	Feb. 24, 2023	Jun. 30, 2022
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40246
Entity Registrant Name	Nextdoor Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-1776836
Entity Address, Address Line One	420 Taylor Street
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94102
City Area Code	415
Local Phone Number	344-0333
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	KIND
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 753.0
Documents Incorporated by Reference	Information required in responses to Part III of Form 10-K is hereby incorporated by reference to portions of the Registrant’s Proxy Statement for the Annual Meeting of Stockholders to be held in 2023. The Proxy Statement will be filed by the Registrant with the Securities and Exchange Commission no later than 120 days after the end of the Registrant’s fiscal year ended December 31, 2022.
Amendment Flag	false
Entity Central Index Key	0001846069
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		157,418,770
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		217,053,757

Redeemable Convertible Preferred Stock, Common Stock, and Stockholders’ Equity (Deficit) - Restricted Stock Units (Details) - Restricted Stock Units shares in Thousands	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Number of Shares
Beginning balance (in shares) \| shares	2,511
RSUs granted (in shares) \| shares	26,514
RSUs vested (in shares) \| shares	(4,520)
RSUs forfeited (in shares) \| shares	(2,519)
Ending balance (in shares) \| shares	21,986
Weighted Average Grant Date Fair Value
Beginning balance (in USD per share) \| $ / shares	$ 8.74
RSUs granted (in USD per share) \| $ / shares	4.14
RSUs vested (in USD per share) \| $ / shares	5.05
RSUs forfeited (in USD per share) \| $ / shares	6.16
Ending balance (in USD per share) \| $ / shares	$ 4.25

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 212,765	$ 192,197	$ 123,284
Costs and expenses:
Cost of revenue	38,981	28,813	21,586
Research and development	127,073	97,096	69,231
Sales and marketing	123,182	106,430	80,325
General and administrative	67,733	54,664	28,793
Total costs and expenses	356,969	287,003	199,935
Loss from operations	(144,204)	(94,806)	(76,651)
Interest income	9,304	177	727
Other income (expense), net	(1,343)	(539)	817
Loss before income taxes	(136,243)	(95,168)	(75,107)
Provision for income taxes	1,673	157	127
Net loss	$ (137,916)	$ (95,325)	$ (75,234)
Net income (loss) per share attributable to common stockholders, basic (in USD per share)	$ (0.36)	$ (0.65)	$ (0.83)
Net income (loss) per share attributable to common stockholders, diluted (in USD per share)	$ (0.36)	$ (0.65)	$ (0.83)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	378,731	146,337	90,190
Weighted average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	378,731	146,337	90,190

Other Balance Sheet Components - Intangible Assets, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,668	$ 11,668
Accumulated Amortization	(8,601)	(6,833)
Net Carrying Amount	$ 3,067	$ 4,835
Weighted Average Remaining Life (years)	1 year 10 months 24 days	2 years 9 months 18 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,068	$ 7,068
Accumulated Amortization	(5,534)	(4,684)
Net Carrying Amount	$ 1,534	$ 2,384
Weighted Average Remaining Life (years)	2 years 1 month 6 days	3 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,600	$ 4,600
Accumulated Amortization	(3,067)	(2,149)
Net Carrying Amount	$ 1,533	$ 2,451
Weighted Average Remaining Life (years)	1 year 8 months 12 days	2 years 8 months 12 days

Reverse Recapitalization (Tables)

12 Months Ended

Dec. 31, 2022

Reverse Recapitalization [Abstract]

Schedule of Reverse Recapitalization

The following table presents the number of shares of common stock issued and outstanding immediately following the Reverse Recapitalization:


			Shares
KVSB Class A common stock, outstanding prior to Reverse Recapitalization			42,767,100
Less: redemption of KVSB Class A common stock			(1,222,040)
Conversion of KVSB Class B founder shares			7,347,249
Conversion of KVSB Class K common stock			3,061,354
Shares issued to PIPE Investors			27,000,000
Nextdoor Class A common stock			78,953,663

Conversion of Legacy Nextdoor common stock (1)			113,526,555
Conversion of Legacy Nextdoor redeemable convertible preferred stock (2)			190,477,421
Nextdoor Class B common stock			304,003,976

Total shares of common stock immediately after Reverse Recapitalization			382,957,639

Redeemable Convertible Preferred Stock, Common Stock, and Stockholders’ Equity (Deficit) - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Number of Options
Beginning balance (in shares)	58,278
Options granted (in shares)	11,914
Options exercised (in shares)	(6,182)
Options forfeited or expired (in shares)	(8,622)
Ending balance (in shares)	55,388	58,278
Exercisable (in shares)	29,223
Vested and expected to vest, outstanding (in shares)	55,490
Weighted- Average Exercise Price
Beginning balance (in USD per share)	$ 2.35
Options granted (in USD per share)	4.42
Options exercised (in USD per share)	2.02
Options forfeited and expired (in USD per share)	3.38
Ending balance (in USD per share)	2.67	$ 2.35
Exercisable (in USD per share)	2.04
Vested and expected to vest, weighted average exercise price (in USD per share)	$ 2.67
Additional Disclosures
Options outstanding, weighted average remaining contractual term (years)	7 years 6 months	8 years 1 month 6 days
Options vested and exercisable, weighted average remaining contractual term (years)	6 years 2 months 12 days
Vested and expected to vest, weighted average remaining contractual term (years)	7 years 6 months
Options outstanding, aggregate intrinsic value	$ 10,552	$ 322,799
Exercisable, aggregate intrinsic value	10,457
Vested and expected to vest, aggregate intrinsic value	$ 10,591

Net Loss Per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders, basic			$ (75,234)
Net loss attributable to common stockholders, diluted			$ (75,234)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	378,731	146,337	90,190
Weighted average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	378,731	146,337	90,190
Net loss per share attributable to common stockholders, basic (in USD per share)	$ (0.36)	$ (0.65)	$ (0.83)
Net loss per share attributable to common stockholders, diluted (in USD per share)	$ (0.36)	$ (0.65)	$ (0.83)
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders, basic	$ (46,344)	$ (8,032)
Net loss attributable to common stockholders, diluted	$ (46,344)	$ (8,032)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	127,266	12,330
Weighted average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	127,266	12,330
Net loss per share attributable to common stockholders, basic (in USD per share)	$ (0.36)	$ (0.65)
Net loss per share attributable to common stockholders, diluted (in USD per share)	$ (0.36)	$ (0.65)
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders, basic	$ (91,572)	$ (87,293)
Net loss attributable to common stockholders, diluted	$ (91,572)	$ (87,293)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	251,465	134,007
Weighted average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	251,465	134,007
Net loss per share attributable to common stockholders, basic (in USD per share)	$ (0.36)	$ (0.65)
Net loss per share attributable to common stockholders, diluted (in USD per share)	$ (0.36)	$ (0.65)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

+ References + Details

Income Taxes - Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Domestic	$ (138,883)	$ (94,693)	$ (74,882)
Foreign	2,640	(475)	(225)
Loss before income taxes	$ (136,243)	$ (95,168)	$ (75,107)

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

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+ Details

Redeemable Convertible Preferred Stock, Common Stock, and Stockholders’ Equity (Deficit) - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 64,420	$ 47,514	$ 22,608
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	2,627	1,466	905
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	35,567	20,690	10,235
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	10,160	6,388	3,403
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 16,066	$ 18,970	$ 8,065

Other Balance Sheet Components - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Depreciation and amortization expense related to property and equipment	$ 3.9	$ 2.0	$ 1.0
Amortization related to intangible assets	$ 1.8	$ 2.2	$ 2.1

Summary of Significant Accounting Policies - Property, Plant and Equipment Useful Lives (Details)	12 Months Ended
	Dec. 31, 2022
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years

Other Balance Sheet Components

12 Months Ended

Dec. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Other Balance Sheet Components

Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):


	As of December 31,
	2022		2021
Computer equipment and software	$	4,103	$	3,123
Furniture and fixtures	2,209		2,201
Capitalized internal-use software	2,123		1,842
Leasehold improvements	10,597		9,502
Property and equipment, gross	19,032		16,668
Less: accumulated depreciation and amortization	(7,214)		(4,123)
Property and equipment, net	$	11,818	$	12,545

Depreciation and amortization expense was $3.9 million, $2.0 million and $1.0 million for the years ended December 31, 2022, 2021 and 2020, respectively.

Intangible Assets, net

The Company’s intangible assets consist of customer relationships and developed technology arising from acquisitions.

Intangible assets, net consisted of the following (in thousands):


	As of December 31, 2022
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Remaining Life (years)
Customer relationships	$	7,068	$	(5,534)	$	1,534	2.1
Developed technology	4,600		(3,067)		1,533		1.7
Total intangible assets, net	$	11,668	$	(8,601)	$	3,067	1.9


	As of December 31, 2021
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Remaining Life (years)
Customer relationships	$	7,068	$	(4,684)	$	2,384	3.0
Developed technology	4,600		(2,149)		2,451		2.7
Total intangible assets, net	$	11,668	$	(6,833)	$	4,835	2.8

Amortization expense related to intangible assets was $1.8 million, $2.2 million and $2.1 million for the years ended December 31, 2022, 2021 and 2020, respectively.

Expected future amortization expense for intangible assets as of December 31, 2022 was as follows (in thousands):


2023	$	1,775
2024	1,057
2025	235
Total	$	3,067

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):


	As of December 31,
	2022		2021
Accrued compensation	$	6,022	$	3,375
Employee stock purchase plan liability	2,076		—
Liability for early exercise of unvested stock options	174		690
Taxes payable	1,425		879
Deferred revenue	6,020		3,388
Other accrued and current liabilities	6,645		7,112
Accrued expenses and other current liabilities	$	22,362	$	15,444

Employee Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
Employee Benefit Plan (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Retirement Benefits [Abstract]
Employer matching contribution cost	$ 1.4	$ 1.1

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Schedule of Purchase Commitments

As of December 31, 2022, the Company had non-cancellable purchase commitments with certain service providers primarily related to the provision of cloud computing services as follows (in thousands):


2023	$	24,770
2024	10,261
2025	1,258
Thereafter	1,326
Total	$	37,615

Fair Value Measurements - Narrative (Details) - Fair Value, Recurring - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	$ 563,863,000	$ 668,293,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	0	$ 0
Financial liabilities	$ 0

Redeemable Convertible Preferred Stock, Common Stock, and Stockholders’ Equity (Deficit) - Additional Information (Details) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Nov. 05, 2021 $ / shares shares	Nov. 30, 2021 shares	Dec. 31, 2022 USD ($) vote $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2018 shares	May 31, 2022 USD ($)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Recapitalization exchange ratio	3.1057
Preferred stock authorized (in shares)	50,000,000
Preferred stock, par value (in USD per share) \| $ / shares	$ 0.0001
Preferred stock issued (in shares)			0	0
Preferred stock outstanding (in shares)			0	0
Current liability related to common stock subject to repurchase \| $			$ 200	$ 700
Unvested shares of common stock subject to repurchase (in shares)			101,593	421,594
Liability related to restricted stock subject to repurchase \| $			$ 0	$ 4,800
Stock-based compensation expense \| $			$ 64,420	$ 47,514	$ 22,608
Shares reserved for issuance (in shares)			128,226,000	138,713,000
Options granted, weighted average grant date fair value (in USD per share) \| $ / shares			$ 2.47	$ 3.63	$ 2.40
Intrinsic value of options exercised \| $			$ 14,000	$ 31,900	$ 9,800
Options granted (in shares)			11,914,000
Unrecognized stock-based compensation expense \| $			$ 165,400
Unrecognized stock-based compensation expense, expected period of recognition			2 years 2 months 12 days
Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Conversion ratio (in shares)	1
Non-employee
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Options granted (in shares)			0	19,639
The 2021 Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares reserved for issuance (in shares)			46,008,885
Increase in number of stock available for grant as a proportion of common stock outstanding (as a percent)			5.00%
Unvested restricted stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Awards issued during period (in shares)						15,408,183
Vesting period						48 months
Unvested restricted common stock subject to repurchase (in shares)				3,210,037
Stock-based compensation expense \| $			$ 3,700	$ 4,600	$ 4,600
Outstanding stock options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Minimum threshold of voting power (as a percent)			10.00%
Minimum proportion of fair market value of stock options granted to grantees that own more than 10% of voting power (as a percent)			110.00%
Expiration period			10 years
Expected dividend yield (as a percent)			0.00%
Outstanding stock options \| Minimum
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period			3 years
Outstanding stock options \| Maximum
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period			4 years
Stock Options - Grantees Owning >10% of Voting Power
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Expiration period			5 years
Class B Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares converted (in shares)	190,477,421
Common stock authorized (in shares)			500,000,000	500,000,000
Number of votes per share \| vote			10
Class B Common Stock \| ESPP \| The 2021 Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares reserved for issuance (in shares)		89,011,590
Increase in number of stock available for grant as a proportion of common stock outstanding (as a percent)		1.00%
ESPP, purchase price as proportion of common stock price (as a percent)		85.00%
Class A Common Stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Common stock authorized (in shares)			2,500,000,000	2,500,000,000
Number of votes per share \| vote			1
Common stock purchased (in shares)			23,251,703
Stock repurchase program, authorized amount \| $							$ 100,000
Common stock retired (in shares)			23,251,703
Average cost per share (in USD per share) \| $ / shares			$ 3.32
Common stock retired, amount \| $			$ 77,200
Stock repurchase program, remaining authorized repurchase amount \| $			$ 22,800
Class A Common Stock \| The 2021 Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Common stock purchased (in shares)			551,765
Class A Common Stock \| Unvested RSUs \| Minimum
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period			3 years
Class A Common Stock \| Unvested RSUs \| Maximum
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period			4 years
Class A Common Stock \| ESPP \| The 2021 Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares reserved for issuance (in shares)		8,901,159

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (137,916)	$ (95,325)	$ (75,234)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,656	4,172	3,058
Stock-based compensation	64,420	47,514	22,608
Bad debt expense	71	317	291
Other	(2,171)	3	239
Changes in operating assets and liabilities:
Accounts receivable, net	(168)	(8,172)	(3,173)
Prepaid expenses and other current assets	4,074	(4,087)	2,472
Operating lease right-of-use assets	6,867	6,605	5,181
Other assets	(323)	370	(221)
Accounts payable	(1,578)	2,759	15
Operating lease liabilities	(7,132)	(5,844)	(4,529)
Accrued expenses and other current liabilities	7,697	420	7,689
Net cash used in operating activities	(60,503)	(51,268)	(41,604)
Cash flows from investing activities:
Purchases of property and equipment	(3,161)	(8,846)	(5,023)
Purchases of marketable securities	(711,887)	(199,832)	(77,600)
Sales of marketable securities	10,789	2,411	21,826
Maturities of marketable securities	366,811	56,745	97,589
Loan to Opportunity Finance Network	(5,000)	0	0
Net cash provided by (used in) investing activities	(342,448)	(149,522)	36,792
Cash flows from financing activities:
Proceeds from exercise of stock options, net of repurchases	12,463	15,334	6,367
Proceeds from issuance of common stock under employee stock purchase plan	1,430	0	0
Proceeds from the Reverse Recapitalization	0	628,489	0
Payment of transaction costs related to the Reverse Recapitalization	(314)	(5,384)	0
Tax withholdings on release of restricted stock units	(695)	(863)	0
Repurchase of common stock	(77,232)	0	0
Net cash provided by (used in) financing activities	(64,348)	637,576	6,367
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	723	283	(796)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(466,576)	437,069	759
Cash, cash equivalents, and restricted cash at beginning of period	521,812	84,743	83,984
Cash, cash equivalents, and restricted cash at end of period	55,236	521,812	84,743
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets:
Cash and cash equivalents	55,236	521,812	83,642
Restricted cash	0	0	1,101
Total cash, cash equivalents, and restricted cash	55,236	521,812	84,743
Supplemental cash flow disclosures:
Cash paid for taxes	1,201	313	30
Non-cash investing and financing activities:
Vesting of restricted stock and early exercised stock options	5,280	6,159	6,240
Lease liabilities arising from obtaining right-of-use assets	0	34,971	40,790
Unpaid deferred transaction costs	0	314	0
Conversion of redeemable convertible preferred stock into Class B common stock in connection with the Reverse Recapitalization	$ 0	$ 447,166	$ 0

Leases (Tables)

12 Months Ended

Dec. 31, 2022

Leases [Abstract]

Schedule of Components of Lease Costs, Other Information, and Lease Terms and Discount Rates

The components of lease costs were as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Operating lease cost	$	9,781	$	9,864	$	6,278
Short-term lease cost	1,417		525		495
Variable lease cost	1,665		409		452
Total	$	12,863	$	10,798	$	7,225

Other information related to the Company’s operating leases was as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	10,045	$	6,585	$	5,624
ROU assets obtained in exchange for new operating lease liabilities:	$	—	$	28,252	$	39,664

Lease terms and discount rates for operating leases were as follows:


	As of December 31,
	2022		2021

Weighted average remaining lease term (years)	6.3		7.3
Weighted average discount rate	4.5	%	4.5	%

Schedule of Future Minimum Lease Payments under Operating Leases

As of December 31, 2022, future minimum lease payments under operating leases were as follows (in thousands):


2023	$	10,347
2024	10,657
2025	10,977
2026	11,306
2027	11,645
Thereafter	16,052
Total lease payments	70,984
Less: imputed interest	(9,387)
Present value of lease liabilities	61,597
Less: current operating lease liabilities	(7,766)
Long-term operating lease liabilities	$	53,831

Leases - Other Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 10,045	$ 6,585	$ 5,624
ROU assets obtained in exchange for new operating lease liabilities:	$ 0	$ 28,252	$ 39,664
Weighted average remaining lease term (years)	6 years 3 months 18 days	7 years 3 months 18 days
Weighted average discount rate (as a percent)	4.50%	4.50%

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Schedule of Loss before Income Taxes

Loss before income taxes were as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Domestic	$	(138,883)	$	(94,693)	$	(74,882)
Foreign	2,640		(475)		(225)
Loss before income taxes	$	(136,243)	$	(95,168)	$	(75,107)

Schedule of Provision for Income Taxes

Provision for income taxes was as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Current:
Federal	$	—	$	—	$	—
State	343		146		11
Foreign	1,560		11		116
Total current provision for income taxes	1,903		157		127
Deferred:
Federal	—		—		—
State	—		—		—
Foreign	(230)		—		—
Total deferred provision for income taxes	(230)		—		—
Total provision for income taxes	$	1,673	$	157	$	127

Schedule of Effective Tax Rate

Income tax expense (benefit) differed from the amount computed by applying the federal statutory income tax rate to pretax loss as a result of the following:


	Year Ended December 31,
	2022		2021		2020
Statutory rate	(21.0)	%	(21.0)	%	(21.0)	%
State tax	0.2		0.2		(2.5)
Permanent items	0.9		0.7		0.4
Transaction costs	—		(4.8)		—
Stock-based compensation	5.3		6.6		4.3
R&D credit	(3.2)		(4.2)		(4.2)
Other	0.5		—		0.1
Changes in valuation allowance	18.5		22.8		22.9
Foreign rate differential	—		(0.1)		0.2
Effective tax rate	1.2	%	0.2	%	0.2	%

Schedule of Deferred Taxes

Tax effects of significant items comprising the Company’s deferred taxes were as follows (in thousands):


	As of December 31,
	2022		2021
Deferred tax assets:
Net operating loss	$	95,567	$	96,423
Credit carryforwards	18,564		14,162
Stock-based compensation	8,071		5,924
Lease liability	14,945		16,691
Reserves, accruals and other	1,948		1,774
Capitalized R&D	22,944		—
Other	1,252		331
Total deferred tax assets	163,291		135,305
Valuation allowance	(150,294)		(120,873)
Total deferred tax assets, net	12,997		14,432
Deferred tax liabilities:
ROU asset basis	(12,752)		(14,432)
Total deferred tax liabilities	(12,752)		(14,432)
Net deferred tax assets	$	245	$	—

Schedule of Unrecognized Tax Benefits

A reconciliation of the beginning and ending balances of unrecognized tax benefit were as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Gross unrecognized tax benefits - beginning of year	$	13,902	$	10,143	$	6,971
Increases related to current year tax positions	4,662		3,759		3,129
Increases related to prior year tax positions	—		—		43
Gross unrecognized tax benefits - end of year	$	18,564	$	13,902	$	10,143

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits - beginning of year	$ 13,902	$ 10,143	$ 6,971
Increases related to current year tax positions	4,662	3,759	3,129
Increases related to prior year tax positions	0	0	43
Gross unrecognized tax benefits - end of year	$ 18,564	$ 13,902	$ 10,143

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2022
Retirement Benefits [Abstract]
Employee Benefit Plan	Employee Benefit PlanThe Company has a 401(k) plan (the “401(k) Plan”) covering all eligible employees in the United States. The Company is allowed to make discretionary profit sharing and qualified non-elective contributions as defined by the 401(k) Plan and as approved by the Board of Directors. Through December 31, 2020, the Company did not match eligible participants’ 401(k) contributions. As of January 1, 2021, the Company began matching a portion of eligible participants’ 401(k) contributions. The Company’s match totaled $1.4 million and $1.1 million for the years ended December 31, 2022 and 2021, respectively. No discretionary profit-sharing contributions have been made to date.

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2022
Audit Information [Abstract]
Auditor Name	Ernst & Young LLP
Auditor Location	San Mateo, California
Auditor Firm ID	42

Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss	$ 95,567	$ 96,423
Credit carryforwards	18,564	14,162
Stock-based compensation	8,071	5,924
Lease liability	14,945	16,691
Reserves, accruals and other	1,948	1,774
Capitalized R&D	22,944	0
Other	1,252	331
Total deferred tax assets	163,291	135,305
Valuation allowance	(150,294)	(120,873)
Total deferred tax assets, net	12,997	14,432
Deferred tax liabilities:
ROU asset basis	(12,752)	(14,432)
Total deferred tax liabilities	(12,752)	(14,432)
Net deferred tax assets	$ 245	$ 0

Net Loss Per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Schedule of Earnings Per Share

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except per share data):


	Year Ended December 31,
	2022				2021				2020
	Class A		Class B		Class A		Class B		Common
Net loss attributable to common stockholders	$	(46,344)	$	(91,572)	$	(8,032)	$	(87,293)	$	(75,234)
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic and diluted	127,266		251,465		12,330		134,007		90,190
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted	$	(0.36)	$	(0.36)	$	(0.65)	$	(0.65)	$	(0.83)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share


	Year Ended December 31,
	2022	2021	2020

Redeemable convertible preferred stock	—	—	190,477
Outstanding stock options	55,388	58,278	46,973
Unvested RSUs	21,986	2,511	—
Unvested early exercised stock options subject to repurchase	102	422	693
Unvested restricted stock	—	3,210	7,062
Shares issuable pursuant to the employee stock purchase plan	2,566	—	—
Contingently issuable shares	7	181	204
Total	80,049	64,602	245,409

Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ 0	$ 0
State	343	146	11
Foreign	1,560	11	116
Total current provision for income taxes	1,903	157	127
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	(230)	0	0
Total deferred provision for income taxes	(230)	0	0
Total provision for income taxes	$ 1,673	$ 157	$ 127

Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
Leases - Lease Cost (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease cost	$ 9,781	$ 9,864	$ 6,278
Short-term lease cost	1,417	525	495
Variable lease cost	1,665	409	452
Total	$ 12,863	$ 10,798	$ 7,225

Income Taxes

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Income Taxes

Loss before income taxes were as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Domestic	$	(138,883)	$	(94,693)	$	(74,882)
Foreign	2,640		(475)		(225)
Loss before income taxes	$	(136,243)	$	(95,168)	$	(75,107)

Provision for income taxes was as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Current:
Federal	$	—	$	—	$	—
State	343		146		11
Foreign	1,560		11		116
Total current provision for income taxes	1,903		157		127
Deferred:
Federal	—		—		—
State	—		—		—
Foreign	(230)		—		—
Total deferred provision for income taxes	(230)		—		—
Total provision for income taxes	$	1,673	$	157	$	127

Income tax expense (benefit) differed from the amount computed by applying the federal statutory income tax rate to pretax loss as a result of the following:


	Year Ended December 31,
	2022		2021		2020
Statutory rate	(21.0)	%	(21.0)	%	(21.0)	%
State tax	0.2		0.2		(2.5)
Permanent items	0.9		0.7		0.4
Transaction costs	—		(4.8)		—
Stock-based compensation	5.3		6.6		4.3
R&D credit	(3.2)		(4.2)		(4.2)
Other	0.5		—		0.1
Changes in valuation allowance	18.5		22.8		22.9
Foreign rate differential	—		(0.1)		0.2
Effective tax rate	1.2	%	0.2	%	0.2	%

Tax effects of significant items comprising the Company’s deferred taxes were as follows (in thousands):


	As of December 31,
	2022		2021
Deferred tax assets:
Net operating loss	$	95,567	$	96,423
Credit carryforwards	18,564		14,162
Stock-based compensation	8,071		5,924
Lease liability	14,945		16,691
Reserves, accruals and other	1,948		1,774
Capitalized R&D	22,944		—
Other	1,252		331
Total deferred tax assets	163,291		135,305
Valuation allowance	(150,294)		(120,873)
Total deferred tax assets, net	12,997		14,432
Deferred tax liabilities:
ROU asset basis	(12,752)		(14,432)
Total deferred tax liabilities	(12,752)		(14,432)
Net deferred tax assets	$	245	$	—

Based upon available objective evidence, management believes it is more likely than not that the U.S. net deferred tax assets will not be fully realizable. Accordingly, the Company has established a full valuation allowance for its U.S. net deferred tax assets. The valuation allowance increased by $29.4 million and $24.8 million, respectively, during 2022 and 2021. The Company had aggregate deferred tax assets of $163.3 million and $135.3 million as of December 31, 2022 and 2021, respectively.

As of December 31, 2022, the Company had federal net operating loss carryforwards of $382.1 million, which begin to expire in 2033, and state net operating loss carryforwards of $234.8 million, which begin to expire in 2029. Of the $382.1 million U.S. federal net operating losses $214.3 million is carried forward indefinitely but is limited to 80% of current year taxable income. As of December 31, 2022, the Company had federal tax credits of $21.9 million, which begin to expire in 2028, and state tax credits of $19.3 million, which do not expire. The Internal Revenue Code (“IRC”) limits the amount of net operating loss carryforwards that a company may use in a given year in the event of certain cumulative changes in ownership over a three-year period as described in Section 382 of the IRC. Utilization of net operating loss carryforwards and credits may be subject to a substantial annual limitation due to the ownership change limitations provided by the IRC, as amended, and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization.

The Company accounts for uncertainty in income taxes in accordance with ASC 740 Income Taxes. Tax positions are evaluated in a two-step process, whereby the Company first determines whether it is more likely than not that a tax position will be sustained upon examination by the tax authority, including resolutions of any related appeals or litigation processes, based on technical merit. If a tax position meets the more-likely-than-not recognition threshold it is then measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement.

A reconciliation of the beginning and ending balances of unrecognized tax benefit were as follows (in thousands):


	Year Ended December 31,
	2022		2021		2020
Gross unrecognized tax benefits - beginning of year	$	13,902	$	10,143	$	6,971
Increases related to current year tax positions	4,662		3,759		3,129
Increases related to prior year tax positions	—		—		43
Gross unrecognized tax benefits - end of year	$	18,564	$	13,902	$	10,143

All of the unrecognized tax benefits as of December 31, 2022 are accounted for as a reduction in the Company’s deferred tax assets. Due to the Company’s valuation allowance, none of the $18.6 million of unrecognized tax benefits, related solely to its federal and state research and development income tax credits, would affect the Company’s effective tax rate, if recognized. The Company does not believe it is reasonably possible that its unrecognized tax benefits will significantly change in the next twelve months.

The Company recognizes interest and penalties related to unrecognized tax benefits as income tax expense. There were no interest or penalties accrued related to unrecognized tax benefits for the years ended December 31, 2022, 2021 and 2020, and no liability for accrued interest or penalties related to unrecognized tax benefits as of December 31, 2022 and 2021.

The Company has identified its U.S. federal and California tax returns as “material” tax filings. The Company is not currently under examination by income tax authorities in any jurisdiction. However, because the Company has net operating losses in several jurisdictions, including the United States federal and various state jurisdictions, certain items attributable to closed tax years are still subject to adjustment by applicable taxing authorities through an adjustment to tax attributes carried forward to open years. All tax returns will remain open for examination by the federal and most state taxing authorities for three years and four years, respectively, from the date of utilization of any net operating loss carryforwards or research and development income tax credits.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 21
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 17
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 14
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 270
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI https://asc.fasb.org/topic&trid=2144680

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Other Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 19,032	$ 16,668
Less: accumulated depreciation and amortization	(7,214)	(4,123)
Property and equipment, net	11,818	12,545
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,103	3,123
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,209	2,201
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,123	1,842
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 10,597	$ 9,502

Other Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Property and Equipment, Net

Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets as follows:


			Estimated Useful Life
Computer equipment and software			3 years
Furniture and fixtures			5 years
Leasehold improvements			Shorter of the estimated useful life of 5 years or the lease term

Property and equipment, net consisted of the following (in thousands):


	As of December 31,
	2022		2021
Computer equipment and software	$	4,103	$	3,123
Furniture and fixtures	2,209		2,201
Capitalized internal-use software	2,123		1,842
Leasehold improvements	10,597		9,502
Property and equipment, gross	19,032		16,668
Less: accumulated depreciation and amortization	(7,214)		(4,123)
Property and equipment, net	$	11,818	$	12,545

Schedule of Intangible Assets, Net

Intangible assets, net consisted of the following (in thousands):


	As of December 31, 2022
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Remaining Life (years)
Customer relationships	$	7,068	$	(5,534)	$	1,534	2.1
Developed technology	4,600		(3,067)		1,533		1.7
Total intangible assets, net	$	11,668	$	(8,601)	$	3,067	1.9


	As of December 31, 2021
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Remaining Life (years)
Customer relationships	$	7,068	$	(4,684)	$	2,384	3.0
Developed technology	4,600		(2,149)		2,451		2.7
Total intangible assets, net	$	11,668	$	(6,833)	$	4,835	2.8

Schedule of Expected Future Amortization Expense for Intangible Assets

Expected future amortization expense for intangible assets as of December 31, 2022 was as follows (in thousands):


2023	$	1,775
2024	1,057
2025	235
Total	$	3,067

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):


	As of December 31,
	2022		2021
Accrued compensation	$	6,022	$	3,375
Employee stock purchase plan liability	2,076		—
Liability for early exercise of unvested stock options	174		690
Taxes payable	1,425		879
Deferred revenue	6,020		3,388
Other accrued and current liabilities	6,645		7,112
Accrued expenses and other current liabilities	$	22,362	$	15,444

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts receivable, allowance for credit loss	$ 422	$ 425
Preferred stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Preferred stock authorized (in shares)	50,000,000	50,000,000
Preferred stock issued (in shares)	0	0
Preferred stock outstanding (in shares)	0	0
Class A Common Stock
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock authorized (in shares)	2,500,000,000	2,500,000,000
Common stock issued (in shares)	153,693,000	78,954,000
Common stock outstanding (in shares)	153,693,000	78,954,000
Class B Common Stock
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock authorized (in shares)	500,000,000	500,000,000
Common stock issued (in shares)	218,029,000	304,701,000
Common stock outstanding (in shares)	218,029,000	304,701,000

Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
Income Taxes - Narrative (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Examination [Line Items]
Change in valuation allowance	$ (29,400,000)	$ 24,800,000
Gross deferred tax assets	163,291,000	135,305,000
Unrecognized tax benefits that would impact effective tax rate	0
Unrecognized tax benefits	18,564,000	13,902,000	$ 10,143,000	$ 6,971,000
Unrecognized tax benefits, interest and penalties accrued during year	0	0
Unrecognized tax benefits, penalties and interest accrued	0	$ 0
Federal
Income Tax Examination [Line Items]
Operating loss carryforwards	382,100,000
Operating loss carryforwards, carried forward indefinitely	214,300,000
Tax credit carryforward	21,900,000
State
Income Tax Examination [Line Items]
Operating loss carryforwards	234,800,000
Tax credit carryforward	$ 19,300,000

Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
2023	$ 10,347
2024	10,657
2025	10,977
2026	11,306
2027	11,645
Thereafter	16,052
Total lease payments	70,984
Less: imputed interest	(9,387)
Present value of lease liabilities	61,597
Less: current operating lease liabilities	(7,766)	$ (7,131)
Long-term operating lease liabilities	$ 53,831	$ 61,598

Fair Value Measurements - Financial Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 35,796
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	44,550
U.S. Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	46,410
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	20,381	$ 474,294
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	6,024
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	9,391
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	35,796	474,294
Marketable securities	528,067	193,999
Total	563,863	668,293
Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	100,844	83,728
Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	278,054	78,363
Fair Value, Recurring \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	41,526	15,188
Fair Value, Recurring \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	16,683	16,720
Fair Value, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	20,381
Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	6,024
Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	9,391
Level 1 \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level 1 \| U.S. Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level 1 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	20,381	474,294
Marketable securities	0	0
Total	20,381	474,294
Level 1 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 1 \| Fair Value, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	20,381
Level 1 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Level 1 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Level 2 \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	44,550
Level 2 \| U.S. Agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	46,410
Level 2 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	15,415	0
Marketable securities	528,067	193,999
Total	543,482	193,999
Level 2 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	100,844	83,728
Level 2 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	278,054	78,363
Level 2 \| Fair Value, Recurring \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	41,526	15,188
Level 2 \| Fair Value, Recurring \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	16,683	$ 16,720
Level 2 \| Fair Value, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Level 2 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	6,024
Level 2 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 9,391

Commitment and Contingencies - Narrative (Details) - Opportunity Finance Network $ in Millions		12 Months Ended
	Jun. 29, 2022 USD ($)	Dec. 31, 2022 USD ($) disbursement
Loss Contingencies [Line Items]
Loans agreement, maximum lending capacity	$ 15.0
Loan agreement, lending grand, terms	24 months
Loan agreement, increments borrowing amount	$ 2.0
Fixed interest rate	0.75%
Loan agreement, terms	10 years
Number of loan disbursements \| disbursement		1
Loan disbursement		$ 5.0
Maximum
Loss Contingencies [Line Items]
Loan agreement, increments borrowing amount	$ 7.5