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Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Liabilities Current [Abstract]    
Accrued clinical and manufacturing costs $ 5,748 $ 3,072
Lease liabilities - short-term 1,798  
Accrued compensation 3,263 3,723
Other accruals 675 904
Deferred rent - short-term   546
Total accrued liabilities $ 11,484 $ 8,245