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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid maintenance and other $ 655 $ 761
Prepayments to CRO's 1,643 420
Prepayments to CMO's 1,340 135
Prepaid insurance 449 1,443
Tax receivable 2,711 2,711
Interest receivable 0 23
Other current assets 1 229
Total prepaid expenses and other current assets $ 6,799 $ 5,722