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flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Equity Component [Domain] Equity Component [Domain] ESPP, purchase price as proportion of common stock price (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Shares issuable pursuant to the ESPP Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan Loss from operations Operating Income (Loss) Opportunity Finance Network Opportunity Finance Network [Member] Opportunity Finance Network U.S. Agency bonds Agency Securities [Member] Release of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Cost of revenue Cost of Revenue Loan agreement, lending grand, terms (in months) Loans Receivable, Lending Grand, Terms Loans Receivable, Lending Grand, Terms Statement [Line Items] Statement [Line Items] Conversion from Class B to Class A common stock Stock Issued During Period, Value, Conversion of Convertible Securities Fair Value Estimate of Fair Value Measurement [Member] Vested or expected to vest (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Additional Disclosures Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Schedule of Marketable Securities Debt Securities, Available-for-Sale [Table Text Block]