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Stockholder's Equity (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
Stock option activity during the year ended December 31, 2023, was as follows (in thousands, except per share amounts):
Stock Options Outstanding
Shares
Weighted-Average
Exercise Price
Weighted-Average
Remaining
Contractual Term
Aggregate Intrinsic
Value (1)
(in years)
Outstanding as of December 31, 202215,799 $13.25 6.1$174,165 
Exercised
(2,756)3.08 
Outstanding as of December 31, 202313,043 $15.41 6.1$282,197 
Exercisable as of December 31, 20237,164 $11.67 4.2$181,762 
(1)We calculate intrinsic value based on the difference between the exercise price of in-the-money-stock options and the fair value of our common stock as of the respective balance sheet date.
Summary of Restricted Stock Unit and Restricted Stock Award Activity
RSU and RSA activity during the year ended December 31, 2023, was as follows (in thousands, except per share amounts):
Restricted Stock Units and Restricted Stock
Awards Outstanding
Shares
Weighted Average
Grant Date Fair Value
Outstanding as of December 31, 202254,518$25.46 
Granted (1)
26,878 25.35 
Released
(27,552)25.11 
Forfeited (1)
(8,745)24.35 
Outstanding as of December 31, 202345,099$25.83 
(1)Includes the effects of awards modified during the year ended December 31, 2023.
Summary of Share-Based Compensation Expense
Share-based compensation expense during the years ended December 31, 2023, 2022 and 2021, was as follows (in thousands):
Year Ended December 31,
202320222021
Cost of revenue $11,117 $7,629 $7,438 
Research and development 422,964 324,161 309,715 
Sales and marketing 96,798 99,467 52,691 
General and administrative 116,981 65,866 45,538 
Total share-based compensation
$647,860 $497,123 $415,382 
Summary of Share-Based Payment Award, Stock Options, Valuation Assumptions which we estimated using the Black‑Scholes option-pricing model with the following assumptions:
Year Ended December 31, 2022
Expected term (in years)6.1
Risk-free interest rate3.2 %
Expected volatility61.1 %
Dividend yield— %