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Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts Payable And Accrued Liabilities Current [Abstract]    
Accrued clinical trial and related costs $ 21,762 $ 11,119
Accrued Leasehold Improvements 7,470 19
Accrued salaries and benefits 4,790 5,094
Accrued research and development 3,392 3,082
Accrued legal fees 582 252
Accrued professional fees 223 253
Accrued other liabilities 797 583
Total accrued and other current liabilities $ 39,016 $ 20,402