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Balance Sheet Items - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]    
Prepaid contract manufacturing and clinical costs $ 4,704 $ 2,714
Prepaid Insurance 1,086 1,897
Prepaid income taxes 1,486 1,486
Prepaid rent   468
Other 966 671
Total $ 8,242 $ 7,236