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Basis of Presentation and Summary of Significant Accounting Policies - Accounting for Share-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Basis of Presentation |  |  |  |
Share-based compensation expense | $ 6,884 | $ 9,107 | $ 20,022 | $ 23,217
SBC - Research and development expenses |  |  |  |
Basis of Presentation |  |  |  |
Share-based compensation expense | 1,639 | 3,277 | 5,362 | 7,920
SBC - General and administrative expenses |  |  |  |
Basis of Presentation |  |  |  |
Share-based compensation expense | $ 5,245 | $ 5,830 | $ 14,660 | $ 15,297

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