Stock-Based Compensation - Compensation expense (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
|
| Stock-based compensation expense | ||
| Stock-based compensation expense | $ 8,260 | $ 8,642 |
| Research and development expenses | ||
| Stock-based compensation expense | ||
| Stock-based compensation expense | 3,477 | 2,531 |
| General and administrative expenses | ||
| Stock-based compensation expense | ||
| Stock-based compensation expense | 4,783 | $ 6,111 |
| Stock options. | ||
| Stock-based compensation expense | ||
| Unrecognized compensation cost | $ 61,000 | |
| Unrecognized compensation cost expected to be recognized over a weighted average period | 2 years 7 months 6 days | |