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Stock-Based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Employee and non-employee stock options |  |  |  |
Stock based compensation expense |  |  |  |
Options granted (in shares) |  |  | 391,000 |
Stock-based compensation expense | $ 26,459 | $ 15,032 | $ 84,797 | $ 34,406
Unrecognized compensation expense | 195,300 |  | $ 195,300 |
Unrecognized compensation expense, weighted average period of recognition |  |  | 2 years 9 months 18 days |
Employee and non-employee stock options | Cost of revenues |  |  |  |
Stock based compensation expense |  |  |  |
Stock-based compensation expense | 1,262 | 458 | $ 3,246 | 1,213
Employee and non-employee stock options | Research and development |  |  |  |
Stock based compensation expense |  |  |  |
Stock-based compensation expense | 6,652 | 3,098 | 17,142 | 7,853
Employee and non-employee stock options | Selling, general and administrative |  |  |  |
Stock based compensation expense |  |  |  |
Stock-based compensation expense | 18,544 | 11,476 | 64,409 | 25,340
Employee stock options |  |  |  |
Stock based compensation expense |  |  |  |
Stock-based compensation expense | 25,982 | 14,943 | 83,645 | 33,790
Employee stock options | Cost of revenues |  |  |  |
Stock based compensation expense |  |  |  |
Stock-based compensation expense | 1,262 | 458 | 3,246 | 1,213
Employee stock options | Research and development |  |  |  |
Stock based compensation expense |  |  |  |
Stock-based compensation expense | 6,242 | 3,081 | 16,168 | 7,394
Employee stock options | Selling, general and administrative |  |  |  |
Stock based compensation expense |  |  |  |
Stock-based compensation expense | $ 18,478 | 11,404 | $ 64,231 | 25,183
Non-employee stock options |  |  |  |
Stock based compensation expense |  |  |  |
Options granted (in shares) |  |  | 32,053 |
Options unvested (in shares) | 1,459 |  | 1,459 |
Stock-based compensation expense | $ 477 | 89 | $ 1,152 | 616
Non-employee stock options | Research and development |  |  |  |
Stock based compensation expense |  |  |  |
Stock-based compensation expense | 410 | 17 | 974 | 459
Non-employee stock options | Selling, general and administrative |  |  |  |
Stock based compensation expense |  |  |  |
Stock-based compensation expense | $ 67 | $ 72 | $ 178 | $ 157

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