Stock-Based Compensation - Compensation expense (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Stock-based compensation expense | |||
| Stock-based compensation expense | $ 15,783 | $ 35,610 | $ 33,665 |
| Research and development expenses | |||
| Stock-based compensation expense | |||
| Stock-based compensation expense | 6,863 | 12,338 | 8,023 |
| General and administrative expenses | |||
| Stock-based compensation expense | |||
| Stock-based compensation expense | $ 8,920 | $ 23,272 | $ 25,642 |