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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Summary of Stock Option Award Activity | The following table summarizes the stock option award activity under the Stock Plans during the nine months ended September 30, 2021:
|  | Class A Number of Shares |  |  | Class B Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value(1) |
|  | (in thousands, except per share data) |
Outstanding at December 31, 2020 |  |  | 4,828 |  |  |  | 796 |  |  | $ | 10.37 |  |  |  | 5.20 |  |  | $ | 223,230 |
Granted |  |  | 48 |  |  |  | — |  |  | $ | 49.63 |  |  |  | — |  |  | $ | — |
Exercised |  |  | (891 | ) |  |  | (66 | ) |  | $ | 12.30 |  |  |  | — |  |  | $ | — |
Forfeited |  |  | (7 | ) |  |  | — |  |  | $ | 13.53 |  |  |  | — |  |  | $ | — |
Outstanding at September 30, 2021 |  |  | 3,978 |  |  |  | 730 |  |  | $ | 10.38 |  |  |  | 4.41 |  |  | $ | 298,934 |
(1) | The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the closing market price of our Class A common stock as of December 31, 2020 and September 30, 2021, respectively.
Summary of Total Stock-based Compensation Expense | Total stock-based compensation expense by function was as follows:
| Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
| 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
| (in thousands) |
Cost of revenue | $ | 9,132 |  |  | $ | 2,623 |  |  | $ | 14,635 |  |  | $ | 6,471 |
Research and development |  | 198,893 |  |  |  | 132,003 |  |  |  | 537,177 |  |  |  | 377,836 |
Sales and marketing |  | 51,675 |  |  |  | 27,393 |  |  |  | 118,250 |  |  |  | 79,306 |
General and administrative |  | 41,198 |  |  |  | 30,061 |  |  |  | 124,509 |  |  |  | 86,687 |
Total | $ | 300,898 |  |  | $ | 192,080 |  |  | $ | 794,571 |  |  | $ | 550,300 |
Restricted Stock Units and Restricted Stock Awards |
Summary of RSU and RSA Activity | Restricted Stock Units and Restricted Stock Awards The following table summarizes the RSU and RSA activity during the nine months ended September 30, 2021:
|  | Class A Outstanding |  |  | Weighted- Average Grant Date Fair Value |
|  | (in thousands, except per share data) |
Unvested at December 31, 2020 |  |  | 131,172 |  |  | $ | 15.10 |
Granted |  |  | 18,168 |  |  | $ | 59.13 |
Vested |  |  | (45,486 | ) |  | $ | 15.64 |
Forfeited |  |  | (7,980 | ) |  | $ | 15.04 |
Unvested at September 30, 2021 |  |  | 95,874 |  |  | $ | 23.19 |

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