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Stockholders’ Equity (Deficit) and Equity Incentive Plan - (Tables)
 3 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Common Stock Reserved for Future Issuance
As of March 31, 2022, the Company had the following shares of common stock reserved for future issuance under its equity incentive plan and employee share purchase plan:
Stock options outstanding8,643,616 
Restricted stock units outstanding3,855,788 
Remaining shares available for future grant under 2021 Equity Incentive Plan(1)
7,066,086 
Remaining shares available for future issuance under ESPP(2)
1,702,246 
Total shares of common stock reserved as of March 31, 202221,267,736 
(1)Includes the automatic annual increase of 2,386,367 additional shares under 2021 Equity Incentive Plan on January 1, 2022.
(2)Includes the automatic annual increase of 477,273 additional shares under ESPP on January 1, 2021.
Summary of Stock Options
A summary of stock option activity under the Company’s equity incentive plans and related information is as follows:
Options Outstanding
Number
of
Shares
Weighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual Life
(in years)		Aggregate
Intrinsic Value
(in thousands)
Balance as of December 31, 2021
9,341,242 $6.83 
Granted— — 
Exercised(545,248)2.45 $7,414 
Cancelled and forfeited(152,378)13.32 
Balance as of March 31, 2022
8,643,616 $6.99 6.47$68,121 
Vested and exercisable5,677,728 $4.32 5.49$54,332 
Summary of RSU Activity Under Equity Incentive Plans and Related Information
A summary of RSU activity under the Company’s equity incentive plans and related information is as follows:
RSUs Outstanding
Number of
Shares
Weighted-Average
Grant Date
Fair Value
Unvested balance as of December 31, 2021
3,737,565 $20.01 
Granted564,350 15.00 
Vested(235,333)23.30 
Cancelled and forfeited(210,794)19.78 
Unvested balance as of March 31, 2022
3,855,788 $19.09 
Schedule of Black-Scholes Assumptions Used to Value the ESPP
Employee Stock Purchase Rights under ESPP
Three Months Ended March 31,
20222021
Expected term0.50 years0.63 years
Expected volatility49.31 %61.00 %
Risk-free interest rate0.07 %0.06 %
Dividend yield— %— %
Summary of Share-based Compensation Expense by line item in the Condensed Consolidated Statements of Operations
The stock-based compensation expense by line item in the accompanying condensed consolidated statements of operations is summarized as follows (in thousands):
Three Months Ended March 31,
20222021
Cost of revenue
Subscription and other platform$868 $237 
Professional services174 62 
Total cost of revenue1,042 299 
Sales and marketing3,692 1,692 
Research and development1,981 782 
General and administrative2,792 2,221 
Total stock-based compensation expense$9,507 $4,994 
Summary of Unrecognized Stock-Based Compensation Expenses
As of March 31, 2022, unrecognized stock-based compensation expense by award type and their weighted-average recognition periods are as follows (in thousands, except years):
Stock OptionRSUESPP
Unrecognized stock-based compensation expense$38,290 $67,929 $96 
Weighted-average amortization period2.64 years3.18 years0.12 years
Schedule of Repurchase Agreements The following table presents certain information regarding shares repurchased under the program during the three months ended March 31, 2022:
Number of shares repurchased964,895 
Average price per share (including commissions)$14.81 
Total repurchase costs (in million)$14.3