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Accrued and Other Current Liabilities - Summary of Accrued and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Accrued compensation $ 3,316 $ 3,833
Accrued CRO costs 490 955
Accrued CMO costs 165 244
Accrued research and development expenses 294 65
Accrued professional services 301 363
Accrued other liabilities 35 272
Total accrued and other liabilities $ 4,601 $ 5,732