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Accrued Expenses and Other Payables (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Accrued Expenses and Other Payables |  |
Accrued clinical and research related expenses | $ 24,482 | $ 11,335
Accrued employee related expenses | 4,722 | 6,413
Accrued professional service fees | 1,566 | 668
Accrued milestone payment to former collaboration partner | 1,500 |
Other | 791 | 82
Total accrued expenses and other payables | $ 33,061 | $ 18,498

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