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Balance Sheet Components - Accrued Expenses and Other Payables (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued Expenses and Other Payables |  |
Accrued clinical and research related expenses | $ 11,335 | $ 7,232
Accrued employee related expenses | 6,413 | 4,637
Accrued professional service fees | 668 | 301
Accrued interest payable |  | 68
Other | 82 | 122
Total accrued expenses and other payables | $ 18,498 | $ 12,360

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