Stock-Based Compensation - Total Stock-based Compensation Recognized (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
|
Stock-based compensation expense: | ||||
Stock-based compensation expense | $ 3,425 | $ 3,513 | $ 6,459 | $ 7,526 |
Research and development | ||||
Stock-based compensation expense: | ||||
Stock-based compensation expense | 1,548 | 1,663 | 2,885 | 3,582 |
General and administrative | ||||
Stock-based compensation expense: | ||||
Stock-based compensation expense | $ 1,877 | $ 1,850 | $ 3,574 | $ 3,944 |