0001846069-22-000024 | 10-Q | XBRL Viewer

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Net Loss Per Share Attributable to Common Stockholders - Narrative (Details)	Mar. 31, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Recapitalization exchange ratio	3.1057
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Recapitalization exchange ratio	3.1057

Geographical Information

3 Months Ended

Mar. 31, 2022

Revenue from Contract with Customer [Abstract]

Geographical Information

Deferred RevenueIn 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 March 31, 2022 and December 31, 2021, deferred revenue was $3.4 million and $3.4 million, respectively, and included within accrued expenses and other current liabilities on the condensed consolidated balance sheets. For the three months ended March 31, 2022 and 2021, revenue recognized from deferred revenue at the beginning of each period was $2.9 million and $1.1 million, respectively.Geographical Information

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


	Three Months Ended March 31,
		2022		2021

United States		$	48,861	$	32,685
International		2,139		1,702
Total		$	51,000	$	34,387

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 http://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 http://asc.fasb.org/extlink&oid=123351226&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 http://asc.fasb.org/extlink&oid=123351226&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 http://asc.fasb.org/extlink&oid=123351226&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 http://asc.fasb.org/extlink&oid=123351226&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 http://asc.fasb.org/extlink&oid=123351226&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 http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

+ Details

Fair Value Measurements - Financial Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 118,881	$ 474,294
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	16,385
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	7,986
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	503,899	193,999
Total cash equivalents and marketable securities	647,151	668,293
Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	283,490	78,363
Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	140,385	83,728
Fair Value, Recurring \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	38,138	15,188
Fair Value, Recurring \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	22,963	16,720
Fair Value, Recurring \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	18,923
Fair Value, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	118,881	474,294
Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	16,385
Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	7,986
Level 1 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Total cash equivalents and marketable securities	118,881	474,294
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 \| Commercial paper
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 \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Level 1 \| Fair Value, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	118,881	474,294
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 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	503,899	193,999
Total cash equivalents and marketable securities	528,270	193,999
Level 2 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	283,490	78,363
Level 2 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	140,385	83,728
Level 2 \| Fair Value, Recurring \| U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	38,138	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	22,963	16,720
Level 2 \| Fair Value, Recurring \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	18,923
Level 2 \| Fair Value, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	$ 0
Level 2 \| Fair Value, Recurring \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	16,385
Level 2 \| Fair Value, Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 7,986

Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Deferred Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Deferred revenue	$ 3,386		$ 3,388
Revenue recognized from contract with customer	$ 2,900	$ 1,100

Common Stock, and Stockholders’ Equity (Deficit) - Restricted Stock Units (Details) - Restricted Stock Units shares in Thousands	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Number of Shares
Beginning balance (in shares) \| shares	2,511
RSUs granted (in shares) \| shares	2,128
RSUs vested (in shares) \| shares	(259)
RSUs forfeited (in shares) \| shares	(90)
Ending balance (in shares) \| shares	4,290
Weighted Average Grant Date Fair Value
Beginning balance (in USD per share) \| $ / shares	$ 8.74
RSUs granted (in USD per share) \| $ / shares	5.58
RSUs vested (in USD per share) \| $ / shares	7.76
RSUs forfeited (in USD per share) \| $ / shares	8.55
Ending balance (in USD per share) \| $ / shares	$ 7.23

Fair Value Measurements

3 Months Ended

Mar. 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 March 31, 2022 and December 31, 2021. The following table presents information about the Company’s financial assets that are measured at fair value on a recurring basis (in thousands):


	Fair Value Measurement as of March 31, 2022
	Level 1		Level 2		Total
Assets:
Cash equivalents:
Money market funds	$	118,881	$	—	$	118,881
Corporate bonds	—		16,385		16,385
Commercial paper	—		7,986		7,986
Marketable securities:
Corporate bonds	—		283,490		283,490
Commercial paper	—		140,385		140,385
U.S. Treasury securities	—		38,138		38,138
Asset-backed securities	—		22,963		22,963
Certificates of deposit	—		18,923		18,923
Total marketable securities	—		503,899		503,899
Total cash equivalents and marketable securities	$	118,881	$	528,270	$	647,151


	Fair Value Measurement as of December 31, 2021
	Level 1		Level 2		Total
Assets:
Cash equivalents:
Money market funds	$	474,294	$	—	$	474,294
Marketable securities:
Commercial paper	—		83,728		83,728
Corporate securities	—		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 cash equivalents and marketable securities	$	474,294	$	193,999	$	668,293

The Company classifies its cash equivalents and marketable securities 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 periods presented.

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.

- 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

Common Stock, and Stockholders’ Equity (Deficit)

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Common Stock, and Stockholders’ Equity (Deficit)

Common Stock and Stockholders’ Equity (Deficit)

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

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 March 31, 2022 and December 31, 2021, the Company had $0.6 million and $0.7 million recorded in accrued expenses and other current liabilities related to 348,884 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 March 31, 2022, the Company had $3.3 million recorded in deposits related to 2,247,025 unvested shares of common stock subject to repurchase. 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 three months ended March 31, 2022 and 2021, the Company recorded stock-based compensation expense of $1.1 million and $1.1 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. As of March 31, 2022, no shares of Class A common stock have been purchased under the 2021 ESPP.

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 four years. RSUs granted for Class A common stock generally vest on a quarterly basis over four years.

A summary of the Company’s stock option activity for the three months ended March 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
Balances at December 31, 2021	58,278	$	2.35	8.1	$	322,799
Options granted	5,817	$	6.05
Options exercised	(2,259)	$	1.84
Options forfeited or expired	(1,925)	$	2.95
Balances at March 31, 2022	59,911	$	2.71	8.1	$	199,094
Options vested and exercisable at March 31, 2022	24,870	$	1.79	6.5	$	104,361

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 $3.28 per share and $3.70 per share during the three months ended March 31, 2022 and 2021, respectively.

The total number of shares vested during the three months ended March 31, 2022 and 2021 was 3,796,345 and 3,952,096, respectively. The weighted average grant-date fair value of options vested was $2.75 per share and $1.90 per share during the three months ended March 31, 2022 and 2021, respectively. The intrinsic value of the options exercised was $9.8 million and $5.5 million for the three months ended March 31, 2022 and 2021, respectively.

The Company did not issue any grants to non-employees during the three months ended March 31, 2022. The Company granted 19,640 options to non-employees during the three months ended March 31, 2021.

A summary of the Company’s RSU activity for the three months ended March 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	2,128	$	5.58
RSUs vested	(259)	$	7.76
RSUs forfeited	(90)	$	8.55
Unvested at March 31, 2022	4,290	$	7.23

Valuation Assumptions

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


	Three Months Ended March 31,
		2022	2021

Expected volatility		53.9% - 55.6%	53.8% -54.5%
Expected term (years)		6.1	6.4
Risk-free interest rate		2.5%	1.1%
Expected dividend yield		—	—
Fair value of common stock per share		$5.58 - $6.06	$4.92 - $5.28

Stock-Based Compensation

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


	Three Months Ended March 31,
		2022		2021

Cost of revenue		$	455	$	264
Research and development		6,635		3,394
Sales and marketing		1,996		1,277
General and administrative		3,058		2,277
Total		$	12,144	$	7,212

As of March 31, 2022, there was $144.8 million of unrecognized stock-based compensation expense, which is expected to be recognized over a weighted average period of 2.3 years.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies 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 March 31, 2022 and December 31, 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 three months ended March 31, 2022 and 2021, 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 March 31, 2022 and December 31, 2021.

Acquisitions - Narrative (Details) - Pixel Labs, Inc - USD ($) $ in Millions		3 Months Ended
	Aug. 27, 2019	Mar. 31, 2022	Mar. 31, 2021
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 7.6
Time-Based Cash Holdback
Business Acquisition [Line Items]
Accrued purchase consideration for acquisition	0.7
Business acquisition, number of shares issued (in shares)		171,635	0
Time-Based Share Holdback
Business Acquisition [Line Items]
Accrued purchase consideration for acquisition	$ 0.2

Fair Value Measurements (Tables)

3 Months Ended

Mar. 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):


	Fair Value Measurement as of March 31, 2022
	Level 1		Level 2		Total
Assets:
Cash equivalents:
Money market funds	$	118,881	$	—	$	118,881
Corporate bonds	—		16,385		16,385
Commercial paper	—		7,986		7,986
Marketable securities:
Corporate bonds	—		283,490		283,490
Commercial paper	—		140,385		140,385
U.S. Treasury securities	—		38,138		38,138
Asset-backed securities	—		22,963		22,963
Certificates of deposit	—		18,923		18,923
Total marketable securities	—		503,899		503,899
Total cash equivalents and marketable securities	$	118,881	$	528,270	$	647,151


	Fair Value Measurement as of December 31, 2021
	Level 1		Level 2		Total
Assets:
Cash equivalents:
Money market funds	$	474,294	$	—	$	474,294
Marketable securities:
Commercial paper	—		83,728		83,728
Corporate securities	—		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 cash equivalents and marketable securities	$	474,294	$	193,999	$	668,293

Reverse Recapitalization - Narrative (Details)
$ in Millions

Nov. 05, 2021

USD ($)

Jul. 06, 2021

USD ($)

Mar. 31, 2022

vote

Dec. 31, 2021

Mar. 31, 2021

Dec. 31, 2020

Business Acquisition [Line Items]

Redeemable convertible preferred stock outstanding (in shares)

^[1]

190,477,000

Common stock outstanding (in shares)

382,957,639

Common stock issued (in shares)

97,886,321

Recapitalization exchange ratio

3.1057

Stock options outstanding (in shares)

19,196,313

59,911,000

58,278,000

Stock redeemed during period (in shares)

1,222,040

Sale of stock, consideration received on transaction | $

$ 270.0

Proceeds From Reverse Recapitalization Transaction | $

$ 628.5

Operating cash account | $

416.4

Trust account | $

0.2

Proceeds from private placement | $

270.0

Amount paid to redeem public shares | $

12.2

KVSB

Business Acquisition [Line Items]

Reverse recapitalization costs incurred | $

45.9

Legacy Nextdoor

Business Acquisition [Line Items]

Reverse recapitalization costs incurred | $

$ 5.7

Common Stock

Business Acquisition [Line Items]

Convertible preferred stock converted (in shares)

61,331,815

Conversion ratio (in shares)

Pixel Labs, Inc

Business Acquisition [Line Items]

Contingent equity consideration (in shares)

58,135

Unvested RSUs

Business Acquisition [Line Items]

Unvested restricted stock units (RSUs)

866,687

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

Conversion of stock (in shares)

190,477,421

Conversion ratio (in shares)

Class B Common Stock

Business Acquisition [Line Items]

Common stock outstanding (in shares)

36,554,506

307,228,000

304,701,000

Common stock issued (in shares)

304,003,976

307,228,000

304,701,000

Recapitalization exchange ratio

3.1057

Stock options outstanding (in shares)

59,616,898

Number of votes per share | vote

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 | 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 A Common Stock

Business Acquisition [Line Items]

Common stock outstanding (in shares)

78,953,663

79,007,000

78,954,000

Common stock issued (in shares)

78,953,663

79,007,000

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

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

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 | 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

[1]	The shares of the Company’s common and redeemable convertible preferred stock prior to the Reverse Recapitalization (as defined in Note 1) have been retroactively restated to reflect the exchange ratio of 3.1057 established in the Merger Agreement as described in Note 3.

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts receivable, allowance for credit loss	$ 312	$ 425
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)	79,007,000	78,954,000
Common stock outstanding (in shares)	79,007,000	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)	307,228,000	304,701,000
Common stock outstanding (in shares)	307,228,000	304,701,000

Net Loss Per Share Attributable to Common Stockholders - Potentially Dilutive Securities Outstanding (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	69,196	259,946
Redeemable convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	0	190,477
Outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	59,911	62,525
Unvested RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	4,290	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)	349	640
Unvested restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	2,247	6,099
Shares issuable pursuant to the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	2,390	0
Contingently issuable shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	9	205

CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($)
shares in Thousands, $ in Thousands

Total

Common Stock

Class A Common Stock

Common Stock

Class B Common Stock

Additional Paid-in Capital

Accumulated Other Comprehensive Loss

Accumulated Deficit

Balance at beginning of period (in shares) at Dec. 31, 2020

^[1]

190,477

Balance at beginning of period at Dec. 31, 2020

$ 447,166

Balance at end of period (in shares) at Mar. 31, 2021

^[1]

190,477

Balance at end of period at Mar. 31, 2021

$ 447,166

Balance at beginning of period (in shares) at Dec. 31, 2020

103,777

^[1]

Balance at beginning of period at Dec. 31, 2020

(297,856)

$ 0

$ 10

$ 87,945

$ (797)

$ (385,014)

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)

^[1]

4,360

Issuance of common stock upon exercise of stock options, net of repurchases of unvested common stock

4,928

Vesting of early exercised stock options

Vesting of restricted stock

1,430

Stock-based compensation

7,212

Other comprehensive income (loss)

Net loss

(25,140)

Balance at end of period (in shares) at Mar. 31, 2021

108,137

^[1]

Balance at end of period at Mar. 31, 2021

$ (309,245)

$ 0

$ 10

101,603

(704)

(410,154)

Balance at beginning of period (in shares) at Dec. 31, 2021

^[1]

Balance at beginning of period at Dec. 31, 2021

$ 0

Balance at end of period (in shares) at Mar. 31, 2022

^[1]

Balance at end of period at Mar. 31, 2022

$ 0

Balance at beginning of period (in shares) at Dec. 31, 2021

78,954

304,701

^[1]

Balance at beginning of period at Dec. 31, 2021

744,985

$ 8

$ 30

1,225,815

(529)

(480,339)

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Release of restricted stock units (in shares)

^[1]

Tax withholdings on release of restricted stock units

$ (695)

(695)

Issuance of common stock upon exercise of stock options, net of repurchases of unvested common stock (in shares)

2,259

^[1]

Issuance of common stock upon exercise of stock options, net of repurchases of unvested common stock

$ 4,145

$ 1

4,144

Issuance of common stock in connection with acquisition (in shares)

^[1]

172

Vesting of early exercised stock options

118

Vesting of restricted stock

1,429

Stock-based compensation

12,144

Other comprehensive income (loss)

(1,512)

Net loss

(32,948)

Balance at end of period (in shares) at Mar. 31, 2022

79,007

307,228

^[1]

Balance at end of period at Mar. 31, 2022

$ 727,666

$ 8

$ 31

$ 1,242,955

$ (2,041)

$ (513,287)

[1]	The shares of the Company’s common and redeemable convertible preferred stock prior to the Reverse Recapitalization (as defined in Note 1) have been retroactively restated to reflect the exchange ratio of 3.1057 established in the Merger Agreement as described in Note 3.

Cash Equivalents and Marketable Securities (Tables)

3 Months Ended

Mar. 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 March 31, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	118,881	$	—	$	—	$	118,881
Corporate bonds	16,387		1		(3)		16,385
Commercial paper	7,984		2		—		7,986
Marketable securities:
Corporate bonds	284,794		16		(1,320)		283,490
Commercial paper	140,379		13		(6)		140,386
U.S. Treasury securities	38,341		—		(203)		38,138
Asset-backed securities	23,082		—		(119)		22,963
Certificates of deposit	18,904		19		(1)		18,922
Total marketable securities	505,500		48		(1,649)		503,899
Total	$	648,752	$	51	$	(1,652)	$	647,151


	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 March 31, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	118,881	$	—	$	—	$	118,881
Corporate bonds	16,387		1		(3)		16,385
Commercial paper	7,984		2		—		7,986
Marketable securities:
Corporate bonds	284,794		16		(1,320)		283,490
Commercial paper	140,379		13		(6)		140,386
U.S. Treasury securities	38,341		—		(203)		38,138
Asset-backed securities	23,082		—		(119)		22,963
Certificates of deposit	18,904		19		(1)		18,922
Total marketable securities	505,500		48		(1,649)		503,899
Total	$	648,752	$	51	$	(1,652)	$	647,151


	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 March 31, 2022
	Amortized Cost		Estimated Fair Value
Due within one year	$	430,204	$	429,237
Due after one to four years	75,296		74,662
Total	$	505,500	$	503,899


	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

Other Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

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


	As of March 31,		As of December 31,
	2022		2021

Accrued compensation	$	4,154	$	3,375
Deferred revenue	3,386		3,388
Taxes payable	1,156		879
Liability for early exercise of unvested stock options	572		690
Other accrued expenses and current liabilities	11,363		7,112
Accrued expenses and other current liabilities	$	20,631	$	15,444

Deferred Revenue

3 Months Ended

Mar. 31, 2022

Revenue from Contract with Customer [Abstract]

Deferred Revenue

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


	Three Months Ended March 31,
		2022		2021

United States		$	48,861	$	32,685
International		2,139		1,702
Total		$	51,000	$	34,387

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

- Definition

+ References

+ Details

Common Stock, and Stockholders’ Equity (Deficit) - Fair Value Assumptions (Details) - Employee and Non-employee Stock Option - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum (as a percent)	53.90%	53.80%
Expected volatility, maximum (as a percent)	55.60%	54.50%
Expected term (years)	6 years 1 month 6 days	6 years 4 months 24 days
Risk-free interest rate (as a percent)	2.50%	1.10%
Expected dividend yield (as a percent)	0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock per share (in USD per share)	$ 5.58		$ 4.92
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		$ 5.28

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 207,968	$ 521,812
Marketable securities	503,899	193,999
Accounts receivable, net of allowance of $312 and $425 as of March 31, 2022 and December 31, 2021, respectively	22,051	29,673
Prepaid expenses and other current assets	11,760	16,259
Total current assets	745,678	761,743
Property and equipment, net	12,886	12,545
Operating lease right-of-use assets	57,735	59,422
Intangible assets, net	4,385	4,835
Goodwill	1,211	1,211
Other assets	304	330
Total assets	822,199	840,086
Current liabilities:
Accounts payable	3,554	6,163
Operating lease liabilities, current	7,286	7,131
Liability for unvested restricted stock	3,335	4,765
Accrued expenses and other current liabilities	20,631	15,444
Total current liabilities	34,806	33,503
Operating lease liabilities, non-current	59,727	61,598
Total liabilities	94,533	95,101
Commitments and contingencies (Note 9)
Stockholders' equity:
Additional paid-in capital	1,242,955	1,225,815
Accumulated other comprehensive loss	(2,041)	(529)
Accumulated deficit	(513,287)	(480,339)
Total stockholders' equity	727,666	744,985
Total liabilities and stockholders' equity	822,199	840,086
Class A Common Stock
Stockholders' equity:
Common stock	8	8
Class B Common Stock
Stockholders' equity:
Common stock	$ 31	$ 30

Summary of Significant Accounting Policies - Narrative (Details)	Mar. 31, 2022 member
Accounting Policies [Abstract]
Number of members of Board of Directors	10

Employee Benefit Plan	3 Months Ended
Employee Benefit Plan	Mar. 31, 2022
Retirement Benefits [Abstract]
Employee Benefit Plan	Employee Benefit PlanThe Company has a 401(k) plan (“the 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 Plan and as approved by the Board of Directors. As of January 1, 2021, the Company began matching a portion of eligible participants’ 401(k) contributions. The Company’s match totaled $0.6 million and $0.5 million for the three months ended March 31, 2022 and March 31, 2021, respectively. No discretionary profit-sharing contributions have been made to date.

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The unaudited condensed 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 condensed consolidated balance sheet as of December 31, 2021 included herein was derived from the audited financial statements as of that date. The Company has condensed or omitted certain information and note disclosures normally included in financial statements prepared in accordance with GAAP pursuant to the applicable required disclosures and regulations of the U.S Securities and Exchange Commission (“SEC”). As such, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021. In management’s opinion, the unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and reflect all adjustments, which include only normal recurring adjustments necessary for the fair statement of the Company’s financial position, results of operations, and cash flows. The results for the three months ended March 31, 2022 are not necessarily indicative of the results to be expected for the full year ending December 31, 2022 or any other future interim or annual period. 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; •Nextdoor 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 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 condensed 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. Significant Accounting Policies There have been no changes to the Company’s significant accounting policies disclosed in Note 2 to the consolidated financial statements described in our Annual Report as of and for the year ended December 31, 2021 that have had a material impact on the Company’s condensed consolidated financial statements and related notes, except as noted below. 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 accounts, corporate bonds, and commercial paper. Interest is accrued as earned. Cash and cash equivalents are recorded at cost, which approximates fair value. 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 condensed consolidated financial statements.

Other Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation	$ 4,154	$ 3,375
Deferred revenue	3,386	3,388
Taxes payable	1,156	879
Liability for early exercise of unvested stock options	572	690
Other accrued expenses and current liabilities	11,363	7,112
Accrued expenses and other current liabilities	$ 20,631	$ 15,444

Acquisitions	3 Months Ended
Acquisitions	Mar. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions Pixel Labs, Inc. Business Combination On August 22, 2019, the Company executed a merger agreement to acquire the assets and liabilities of Pixel Labs, Inc. (“Pixel Labs”). The acquisition closed on August 27, 2019. The purchase accounting was completed in 2019 and no measurement period adjustments were recorded. The aggregate purchase consideration of $7.6 million included a time-based cash and share holdback of $0.7 million and $0.2 million, respectively, to be paid at a future date. In November 2020 final settlement of the holdback was completed. At closing, certain Pixel Labs stockholders had not completed administrative forms that were required for the Company’s common stock to be legally issued. During the three months ended March 31, 2022 an additional 171,635 shares were issued as a result of the administrative forms being completed. During the three months ended March 31, 2021 no shares were issued as a result of the administrative forms being completed.

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	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders, basic		$ (25,140)
Net loss attributable to common stockholders, diluted		$ (25,140)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	381,877	97,873
Weighted average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	381,877	97,873
Net loss per share attributable to common stockholders, basic (in USD per share)	$ (0.09)	$ (0.26)
Net loss per share attributable to common stockholders, diluted (in USD per share)	$ (0.09)	$ (0.26)
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders, basic	$ (6,814)
Net loss attributable to common stockholders, diluted	$ (6,814)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	78,980
Weighted average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	78,980
Net loss per share attributable to common stockholders, basic (in USD per share)	$ (0.09)
Net loss per share attributable to common stockholders, diluted (in USD per share)	$ (0.09)
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders, basic	$ (26,134)
Net loss attributable to common stockholders, diluted	$ (26,134)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	302,897
Weighted average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	302,897
Net loss per share attributable to common stockholders, basic (in USD per share)	$ (0.09)
Net loss per share attributable to common stockholders, diluted (in USD per share)	$ (0.09)

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 65
-Paragraph 1
-Subparagraph (e)(4)
-URI http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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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.

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Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed 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 condensed consolidated balance sheet as of December 31, 2021 included herein was derived from the audited financial statements as of that date. The Company has condensed or omitted certain information and note disclosures normally included in financial statements prepared in accordance with GAAP pursuant to the applicable required disclosures and regulations of the U.S Securities and Exchange Commission (“SEC”). As such, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021. In management’s opinion, the unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and reflect all adjustments, which include only normal recurring adjustments necessary for the fair statement of the Company’s financial position, results of operations, and cash flows. The results for the three months ended March 31, 2022 are not necessarily indicative of the results to be expected for the full year ending December 31, 2022 or any other future interim or annual period. 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; •Nextdoor 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 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	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 condensed 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.
Significant Accounting Policies and Recently Adopted Accounting Pronouncements	Significant Accounting Policies There have been no changes to the Company’s significant accounting policies disclosed in Note 2 to the consolidated financial statements described in our Annual Report as of and for the year ended December 31, 2021 that have had a material impact on the Company’s condensed consolidated financial statements and related notes, except as noted below. 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 condensed consolidated financial statements.
Cash and Cash Equivalents	Cash and Cash EquivalentsCash 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 accounts, corporate bonds, and commercial paper. Interest is accrued as earned. Cash and cash equivalents are recorded at cost, which approximates fair value.

CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) (Parenthetical)	Mar. 31, 2022
Recapitalization exchange ratio	3.1057
Class B Common Stock
Recapitalization exchange ratio	3.1057

Cash Equivalents and Marketable Securities

3 Months Ended

Mar. 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 March 31, 2022
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	118,881	$	—	$	—	$	118,881
Corporate bonds	16,387		1		(3)		16,385
Commercial paper	7,984		2		—		7,986
Marketable securities:
Corporate bonds	284,794		16		(1,320)		283,490
Commercial paper	140,379		13		(6)		140,386
U.S. Treasury securities	38,341		—		(203)		38,138
Asset-backed securities	23,082		—		(119)		22,963
Certificates of deposit	18,904		19		(1)		18,922
Total marketable securities	505,500		48		(1,649)		503,899
Total	$	648,752	$	51	$	(1,652)	$	647,151


	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 March 31, 2022 and December 31, 2021.

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


	As of March 31, 2022
	Amortized Cost		Estimated Fair Value
Due within one year	$	430,204	$	429,237
Due after one to four years	75,296		74,662
Total	$	505,500	$	503,899


	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

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 28	$ 39

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Other Balance Sheet Components

3 Months Ended

Mar. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Other Balance Sheet Components

Accrued Expenses and Other Current Liabilities

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


	As of March 31,		As of December 31,
	2022		2021

Accrued compensation	$	4,154	$	3,375
Deferred revenue	3,386		3,388
Taxes payable	1,156		879
Liability for early exercise of unvested stock options	572		690
Other accrued expenses and current liabilities	11,363		7,112
Accrued expenses and other current liabilities	$	20,631	$	15,444

Reverse Recapitalization

3 Months Ended

Mar. 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 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.

Employee Benefit Plan (Details) - USD ($)	3 Months Ended
Employee Benefit Plan (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Retirement Benefits [Abstract]
Employer matching contribution cost	$ 600,000	$ 500,000
Employed discretionary contribution amount	$ 0

Common Stock, and Stockholders’ Equity (Deficit) - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 12,144	$ 7,212
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	455	264
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	6,635	3,394
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	1,996	1,277
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 3,058	$ 2,277

Reverse Recapitalization (Tables)

3 Months Ended

Mar. 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

Net Loss Per Share Attributable to Common Stockholders

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Net Loss Per Share Attributable to Common Stockholders

As a result of the Reverse Recapitalization, the Company has retroactively adjusted the weighted average number of shares of common stock outstanding prior to the Closing by multiplying them by the Exchange Ratio of 3.1057 used to determine the number of shares of common stock into which they converted. 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):


	Three Months Ended March 31,
	2022				2021
	Class A		Class B		Common
Net loss attributable to common stockholders	$	(6,814)	$	(26,134)	$	(25,140)
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic and diluted	78,980		302,897		97,873
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted	$	(0.09)	$	(0.09)	$	(0.26)

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):


	As of March 31,
		2022	2021

Redeemable convertible preferred stock		—	190,477
Outstanding stock options		59,911	62,525
Unvested RSUs		4,290	—
Unvested early exercised stock options subject to repurchase		349	640
Unvested restricted stock		2,247	6,099
Shares issuable pursuant to the ESPP		2,390	—
Contingently issuable shares		9	205
Total		69,196	259,946

Geographical Information (Tables)

3 Months Ended

Mar. 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):


	Three Months Ended March 31,
		2022		2021

United States		$	48,861	$	32,685
International		2,139		1,702
Total		$	51,000	$	34,387

Common Stock, and Stockholders’ Equity (Deficit) - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2018	Dec. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Current liability related to common stock subject to repurchase	$ 600			$ 700
Unvested shares of common stock subject to repurchase (in shares)	348,884			421,594
Liability related to restricted stock subject to repurchase	$ 3,300			$ 4,800
Stock-based compensation expense	$ 12,144	$ 7,212
Options granted, weighted average grant date fair value (in USD per share)	$ 3.28	$ 3.70
Options vested (in shares)	3,796,345	3,952,096
Weighted average grant-date fair value of options vested (in USD per share)	$ 2.75	$ 1.90
Intrinsic value of options exercised	$ 9,800	$ 5,500
Options granted (in shares)	5,817,000
Unrecognized stock-based compensation expense	$ 144,800
Unrecognized stock-based compensation expense, expected period of recognition	2 years 3 months 18 days
Non-employee
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Options granted (in shares)	0
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%
Outstanding stock options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period	4 years
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
Stock Options - Grantees Owning >10% of Voting Power
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Expiration period	5 years
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)	2,247,025			3,210,037
Stock-based compensation expense	$ 1,100	$ 1,100
Class A Common Stock \| The 2021 Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Common stock purchased (in shares)	0
Class A Common Stock \| Unvested RSUs
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
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%

Geographical Information - Summary (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 51,000	$ 34,387
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	48,861	32,685
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,139	$ 1,702

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Description of Business	3 Months Ended
Description of Business	Mar. 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.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue	$ 51,000	$ 34,387
Costs and expenses:
Cost of revenue	9,055	6,337
Research and development	28,960	20,820
Sales and marketing	31,061	22,894
General and administrative	15,150	9,329
Total costs and expenses	84,226	59,380
Loss from operations	(33,226)	(24,993)
Interest income	491	40
Other expense, net	(185)	(148)
Loss before income taxes	(32,920)	(25,101)
Provision for income taxes	28	39
Net loss	$ (32,948)	$ (25,140)
Net loss per share attributable to common stockholders, basic (in USD per share)	$ (0.09)	$ (0.26)
Net loss per share attributable to common stockholders, diluted (in USD per share)	$ (0.09)	$ (0.26)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	381,877	97,873
Weighted average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	381,877	97,873

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s provision for income taxes for interim periods was determined using an estimate of its annual effective tax rate, adjusted for discrete items, if any, that arose during the period. Each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual effective tax rate changes, the Company makes a cumulative adjustment in such period. The Company’s quarterly tax provision, and estimate of its annual effective tax rate, is subject to variation due to several factors, including variability in pretax income (or loss), the mix of jurisdictions to which such income (or loss) relates, tax law developments and changes in how the Company does business, such as acquisitions, intercompany transactions, or the Company’s corporate structure. The Company recorded an income tax expense for the three months ended March 31, 2022 and 2021 of less than $0.1 million and $0.1 million, respectively, both of which were primarily driven by foreign taxes.

- 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.

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+ Details

Reverse Recapitalization - Common Stock Issued and Outstanding Following the Reverse Recapitalization (Details) - shares

Nov. 05, 2021

Mar. 31, 2022

Dec. 31, 2021

Mar. 31, 2021

Dec. 31, 2020

Business Acquisition [Line Items]

Common stock outstanding (in shares)

382,957,639

Less: redemption of KVSB Class A common stock (in shares)

(1,222,040)

Shares issued (in shares)

27,000,000

Redeemable convertible preferred stock outstanding (in shares)

^[1]

190,477,000

Class B Common Stock

Business Acquisition [Line Items]

Common stock outstanding (in shares)

36,554,506

307,228,000

304,701,000

Class A Common Stock

Business Acquisition [Line Items]

Common stock outstanding (in shares)

78,953,663

79,007,000

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

Redeemable convertible preferred stock issued (in shares)

61,331,815

Redeemable convertible preferred stock outstanding (in shares)

61,331,815

Conversion ratio (in shares)

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

[1]	The shares of the Company’s common and redeemable convertible preferred stock prior to the Reverse Recapitalization (as defined in Note 1) have been retroactively restated to reflect the exchange ratio of 3.1057 established in the Merger Agreement as described in Note 3.

Cash Equivalents and Marketable Securities - Maturities of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Rolling Maturity Amortized Cost
Due within one year	$ 430,204
Due after one to four years	75,296
Total	505,500	$ 194,016
Rolling Maturity, Fair Value
Due after one to four years	429,237
Due after one to four years	74,662
Total	503,899	193,999
Amortized Cost
Due within one year		137,077
Due after one to four years		56,939
Total	505,500	194,016
Estimated Fair Value
Due within one year		137,043
Due after one to four years		56,956
Total	$ 503,899	$ 193,999

Common Stock, and Stockholders’ Equity (Deficit) - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Number of Options
Beginning balance (in shares)	58,278
Options granted (in shares)	5,817
Options exercised (in shares)	(2,259)
Options forfeited or expired (in shares)	(1,925)
Ending balance (in shares)	59,911
Options vested and exercisable (in shares)	24,870
Weighted Average Exercise Price
Beginning balance (in USD per share)	$ 2.35
Options granted (in USD per share)	6.05
Options exercised (in USD per share)	1.84
Options forfeited and expired (in USD per share)	2.95
Ending balance (in USD per share)	2.71
Options vested and exercisable (in USD per share)	$ 1.79
Additional Disclosures
Options outstanding, weighted average remaining contractual term (years)	8 years 1 month 6 days	8 years 1 month 6 days
Options vested and exercisable, weighted average remaining contractual term (years)	6 years 6 months
Options outstanding, aggregate intrinsic value	$ 199,094		$ 322,799
Options vested and exercisable, aggregate intrinsic value	$ 104,361

Fair Value Measurements - Narrative (Details) - Fair Value, Recurring - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets	$ 647,151,000	$ 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	$ 0

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (32,948)	$ (25,140)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,330	1,083
Stock-based compensation	12,144	7,212
Bad debt expense	(221)	(97)
Other	(582)	125
Changes in operating assets and liabilities:
Accounts receivable, net	7,843	5,092
Prepaid expenses and other current assets	4,499	3
Operating lease right-of-use assets	1,687	1,641
Other assets	26	389
Accounts payable	(3,143)	321
Operating lease liabilities	(1,716)	(863)
Accrued expenses and other current liabilities	5,568	1,484
Net cash used in operating activities	(5,513)	(8,750)
Cash flows from investing activities:
Purchases of property and equipment	(637)	(1,894)
Purchases of marketable securities	(318,245)	(4,395)
Maturities of marketable securities	7,342	15,245
Net cash provided by (used in) investing activities	(311,540)	8,956
Cash flows from financing activities:
Proceeds from exercise of stock options, net of repurchases	4,145	4,928
Payment of transaction costs related to the Reverse Recapitalization	(314)	0
Tax withholdings on release of restricted stock units	(695)	0
Net cash provided by financing activities	3,136	4,928
Effect of exchange rate changes on cash and cash equivalents	73	90
Net increase (decrease) in cash and cash equivalents	(313,844)	5,224
Cash and cash equivalents at beginning of period	521,812	84,743
Cash and cash equivalents at end of period	207,968	89,967
Supplemental cash flow disclosures:
Cash paid for taxes, net	0	135
Non-cash investing and financing activities:
Vesting of restricted stock and early exercised stock options	1,547	1,518
Lease liabilities arising from obtaining right-of-use assets	0	34,971
Purchases of property and equipment not yet settled	$ 584	$ 1,589

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net loss	$ (32,948)	$ (25,140)
Other comprehensive income (loss):
Foreign currency translation adjustments	74	90
Change in unrealized gain (loss) on available-for-sale marketable securities	(1,586)	3
Total other comprehensive income (loss)	(1,512)	93
Comprehensive loss	$ (34,460)	$ (25,047)

- 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

Cash Equivalents and Marketable Securities - Amortized Cost, Unrealized Gains and Losses, and Estimated Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Marketable securities:
Amortized Cost	$ 505,500	$ 194,016
Unrealized Gain	48	24
Unrealized Loss	(1,649)	(41)
Estimated Fair Value	503,899	193,999
Total
Amortized Cost	648,752
Unrealized Gain	51
Unrealized Loss	(1,652)
Estimated Fair Value	647,151
Corporate bonds
Marketable securities:
Amortized Cost	284,794	78,353
Unrealized Gain	16	24
Unrealized Loss	(1,320)	(14)
Estimated Fair Value	283,490	78,363
Commercial paper
Marketable securities:
Amortized Cost	140,379	83,728
Unrealized Gain	13	0
Unrealized Loss	(6)	0
Estimated Fair Value	140,386	83,728
U.S. Treasury securities
Marketable securities:
Amortized Cost	38,341	15,200
Unrealized Gain	0	0
Unrealized Loss	(203)	(12)
Estimated Fair Value	38,138	15,188
Asset-backed securities
Marketable securities:
Amortized Cost	23,082	16,735
Unrealized Gain	0	0
Unrealized Loss	(119)	(15)
Estimated Fair Value	22,963	16,720
Certificates of deposit
Marketable securities:
Amortized Cost	18,904
Unrealized Gain	19
Unrealized Loss	(1)
Estimated Fair Value	18,922
Money market funds
Cash equivalents:
Amortized Cost	118,881	474,294
Estimated Fair Value	118,881	474,294
Total
Amortized Cost		668,310
Estimated Fair Value		$ 668,293
Corporate bonds
Cash equivalents:
Amortized Cost	16,387
Unrealized Gain	1
Unrealized Loss	(3)
Estimated Fair Value	16,385
Commercial paper
Cash equivalents:
Amortized Cost	7,984
Unrealized Gain	2
Unrealized Loss	0
Estimated Fair Value	$ 7,986

Net Loss Per Share Attributable to Common Stockholders (Tables)

3 Months Ended

Mar. 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):


	Three Months Ended March 31,
	2022				2021
	Class A		Class B		Common
Net loss attributable to common stockholders	$	(6,814)	$	(26,134)	$	(25,140)
Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic and diluted	78,980		302,897		97,873
Net loss per share attributable to Class A and Class B common stockholders, basic and diluted	$	(0.09)	$	(0.09)	$	(0.26)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share


	As of March 31,
		2022	2021

Redeemable convertible preferred stock		—	190,477
Outstanding stock options		59,911	62,525
Unvested RSUs		4,290	—
Unvested early exercised stock options subject to repurchase		349	640
Unvested restricted stock		2,247	6,099
Shares issuable pursuant to the ESPP		2,390	—
Contingently issuable shares		9	205
Total		69,196	259,946

Common Stock, and Stockholders’ Equity (Deficit) (Tables)

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Summary of Stock Option Activity

A summary of the Company’s stock option activity for the three months ended March 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
Balances at December 31, 2021	58,278	$	2.35	8.1	$	322,799
Options granted	5,817	$	6.05
Options exercised	(2,259)	$	1.84
Options forfeited or expired	(1,925)	$	2.95
Balances at March 31, 2022	59,911	$	2.71	8.1	$	199,094
Options vested and exercisable at March 31, 2022	24,870	$	1.79	6.5	$	104,361

Schedule of Restricted Stock Unit Activity

A summary of the Company’s RSU activity for the three months ended March 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	2,128	$	5.58
RSUs vested	(259)	$	7.76
RSUs forfeited	(90)	$	8.55
Unvested at March 31, 2022	4,290	$	7.23

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:


	Three Months Ended March 31,
		2022	2021

Expected volatility		53.9% - 55.6%	53.8% -54.5%
Expected term (years)		6.1	6.4
Risk-free interest rate		2.5%	1.1%
Expected dividend yield		—	—
Fair value of common stock per share		$5.58 - $6.06	$4.92 - $5.28

Schedule of Stock-based Compensation Expense

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


	Three Months Ended March 31,
		2022		2021

Cost of revenue		$	455	$	264
Research and development		6,635		3,394
Sales and marketing		1,996		1,277
General and administrative		3,058		2,277
Total		$	12,144	$	7,212