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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Jun. 30, 2015
Performance-based awards |  |  |  |
Stock Based Compensation |  |  |  |
Stock-based compensation expense | $ 11,000 | $ 1,400 |  |
Employee and non-employee stock options |  |  |  |
Stock Based Compensation |  |  |  |
Stock-based compensation expense | $ 23,232 | $ 7,417 |  |
Shares granted | 1,180,000 |  |  |
Shares available for issuance | 5,408,000 |  | 3,197,000 |
Restricted stock units |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares vested | 632,000 |  |  |
Shares granted | 1,180,000 |  |  |
2015 Employee Stock Purchase Plan |  |  |  |
Stock Based Compensation |  |  |  |
Shares reserved for issuance | 3,045,966 |  |  | 3,451,495
Shares granted | 0 |  |  |
Shares reserved for issuance as a proportion of common stock outstanding (as a percent) | 4.00% |  |  |
2015 Employee Stock Purchase Plan | Minimum |  |  |  |
Stock Based Compensation |  |  |  |
Shares reserved for issuance | 880,000 |  |  |
Additional shares reserved for issuance | 3,500,000 |  |  |
Shares reserved for issuance as a proportion of common stock outstanding (as a percent) | 1.00% |  |  |

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