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Certain Balance Sheet Accounts - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Recoverable research and development tax credits $ 6,943 $ 0
Prepaid research and development expenses 2,661 1,500
Prepaid expenses 1,960 0
Other assets 1,050 11
Total prepaid expenses and other current assets $ 12,614 $ 1,511