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Stockholders' equity (Tables)
 9 Months Ended
Sep. 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:
September 30,December 31,
20242023
2010 Equity Incentive Plan:
Stock options outstanding2,208,391 4,621,021 
2021 Equity Incentive Plan:
RSUs outstanding and PSUs(1)
17,394,641 16,738,309 
Shares available for future issuance under:
2021 Equity Incentive Plan9,658,846 4,093,695 
2021 Employee Stock Purchase Plan3,374,376 2,350,803 
Total shares of common stock reserved32,636,254 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 7,809,7279.63 553,56810.98 
Released(5,118,303)14.81 (165,192)8.89 
Canceled(2,141,728)13.69 (235,596)8.89 
Unvested - September 30, 2024
16,319,273$11.77 798,613$10.34 
Awards vested, not yet released - September 30, 2024
13,832$8.77 — $— 
(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 (2,350,902)5.43 
Canceled (61,728)7.94 
Balance - September 30, 2024
2,158,391 $4.61 4.58$6,961 
Vested & expected to vest as of September 30, 2024
2,158,391 $4.61 4.58$6,961 
Exercisable as of September 30, 2024
2,153,129 $4.58 4.57$6,961 
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 September 30,
Nine Months Ended September 30,
2024202320242023
Cost of revenue$1,807 $1,788 $5,277 $5,130 
Sales and marketing7,573 7,646 22,578 23,022 
Research and development7,183 7,045 21,187 19,762 
General and administrative6,839 7,005 21,382 23,806 
Restructuring charges(160)— (160)1,208 
Total stock-based compensation expense$23,242 $23,484 $70,264 $72,928 
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:
Nine Months Ended
September 30, 2024
Risk-free interest rate5.1 %
Expected volatility51.9 %
Expected life (in years)1.3
Expected dividend yield— %