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Stockholders' equity (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Common Stock Reserved for Future Issuance Shares of common stock reserved for future issuance consisted of the following:
June 30,December 31,
20242023
2010 Equity Incentive Plan:
Stock options outstanding2,417,020 4,621,021 
2021 Equity Incentive Plan:
RSUs outstanding and PSUs(1)
18,817,070 16,738,309 
Shares available for future issuance under:
2021 Equity Incentive Plan9,357,028 4,093,695 
2021 Employee Stock Purchase Plan3,374,376 2,350,803 
Total shares of common stock reserved33,965,494 27,803,828 
(1) For those PSUs in their respective performance periods, the number of shares reserved for issuance is based on the maximum achievement of the corporate performance metrics.
Schedule of RSU and PSU Activity
A summary of RSU and PSU activity under the 2021 Plan is as follows:
RSUs OutstandingWeighted Average Grant Date Fair Value
PSUs Outstanding(1)
Weighted Average Grant Date Fair Value
Unvested - December 31, 2023
15,769,577$14.07 645,833$8.89 
Granted 6,316,31110.04 553,56810.98 
Released(3,241,601)15.19 (140,684)8.89 
Canceled(1,127,093)14.80 (235,596)8.89 
Unvested - June 30, 2024
17,717,194$12.39 823,121$10.30 
Awards vested, not yet released - June 30, 2024
8,276$9.66 — $— 
(1) Canceled PSU shares consist of awards forfeited as well as the difference in the number of shares granted at target in 2023 and the shares certified by the Board based on actual achievement.
Schedule of Option Activity
The following is a summary of activity for stock options having only service-based vesting conditions under the Equity Incentive Plans:
Options OutstandingWeighted Average Exercise PriceWeighted Average Remaining Contractual TermAggregate Intrinsic Value
(In Thousands)
Balance - December 31, 2023
4,571,021 $5.08 3.23$44,309 
Granted — — 
Exercised (2,146,724)5.59 
Canceled (57,277)8.15 
Balance - June 30, 2024
2,367,020 $4.54 4.92$10,317 
Vested & expected to vest as of June 30, 2024
2,367,020 $4.54 4.92$10,317 
Exercisable as of June 30, 2024
2,353,087 $4.48 4.91$10,317 
Schedule of Weighted Average Assumptions, Options
The following table summarizes the weighted-average assumptions used in the Black-Scholes option-pricing model to estimate the fair value of employee stock purchase rights granted under the new ESPP offering period:
Three and Six Months Ended
June 30, 2024
Risk-free interest rate5.1 %
Expected volatility51.9 %
Expected life (in years)1.3
Expected dividend yield— %
Schedule of Stock-Based Compensation Expense
Total stock-based compensation expense included in the condensed consolidated statements of operations was as follows (in thousands):
Three Months Ended June 30,
Six Months Ended June 30,
2024202320242023
Cost of revenue$1,813 $1,749 $3,470 $3,342 
Sales and marketing7,664 8,099 15,005 15,376 
Research and development7,329 6,423 14,004 12,717 
General and administrative7,511 6,890 14,543 16,801 
Restructuring charges— — — 1,208 
Total stock-based compensation expense$24,317 $23,161 $47,022 $49,444