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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Apr. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2015
Performance-based awards |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 9,600 | $ 6,600 |  | $ 39,500 | $ 11,800 |  |
Employee and non-employee stock options |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 26,459 | $ 15,032 |  | $ 84,797 | $ 34,406 |  |
Shares granted |  |  |  |  | 1,528,000 |  |  |
Shares available for issuance |  | 4,986,000 |  |  | 4,986,000 |  | 3,197,000 |
Restricted stock units |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  | 1,707,000 |  |  |
Shares granted |  |  |  |  | 1,528,000 |  |  |
2015 Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |
Shares reserved for issuance |  | 2,940,084 |  |  | 2,940,084 |  |  | 3,451,495
Shares granted | 0 |  |  | 106,435 |  |  |  |
Proceeds from shares purchased |  |  |  | $ 6,100 |  |  |  |
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 |  |  | 880,000 |  |  |
Additional shares reserved for issuance |  | 3,500,000 |  |  | 3,500,000 |  |  |
Shares reserved for issuance as a proportion of common stock outstanding (as a percent) |  |  |  |  | 1.00% |  |  |

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