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Equity Incentive Plans (Tables)
6 Months Ended
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Recorded Stock-based Compensation Expense in the Condensed Consolidated Statement of Operations
The Company recorded stock-based compensation expense in the condensed consolidated statement of operations for the periods presented as follows (in thousands):
Three Months Ended
June 30,
Six Months Ended
June 30,
2023202220232022
Cost of revenue$1,835 $1,453 $3,296 $2,467 
Research and development19,560 15,579 37,340 26,870 
Selling, general and administrative24,301 19,281 47,161 33,023 
Total stock-based compensation expense$45,696 $36,313 $87,797 $62,360 
Schedule of RSU activity
Restricted stock unit activity for the six months ended June 30, 2023 is as follows:
Restricted Stock
Units
Weighted-Average
Grant Date Fair Value
(per share)
Outstanding as of December 31, 20225,836,192 $52.21 
Granted1,948,808 50.68 
Vested(922,619)61.97 
Cancelled(428,549)57.69 
Outstanding as of June 30, 20236,433,832 $49.98 
Schedule of the Company's Stock Option Activity
Stock option activity for the six months ended June 30, 2023 is as follows:
Stock OptionsWeighted-Average
Exercise Price
Outstanding as of December 31, 20227,964,557 $37.10 
Granted300,870 50.80 
Exercised(1,088,527)5.02 
Cancelled and forfeited(169,273)82.96 
Outstanding as of June 30, 20237,007,627 $41.56 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions
The Company estimates the fair values of shares granted under the PSAs using a Monte Carlo simulation model with the following assumptions:
Expected volatility 71%
Risk-free interest rate3.7%
Expected dividend—%