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Balance Sheet Details - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Prepaid research and development $ 3,748 $ 4,473
Prepaid expenses 730 610
Other current assets 282 570
Interest receivable 81 194
Total prepaid expenses and other current assets $ 4,841 $ 5,847