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Balance Sheet Details - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Prepaid research and development $ 2,715 $ 4,473
Prepaid expenses 774 610
Other current assets 296 570
Interest receivable 67 194
Total prepaid expenses and other current assets $ 3,852 $ 5,847