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Supplementary Balance Sheet Information - Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property, equipment and depreciation and amortization    
Property and equipment, gross $ 3,640 $ 3,628
Less—accumulated depreciation and amortization (3,218) (3,004)
Property and equipment, net 422 624
Furniture and office equipment    
Property, equipment and depreciation and amortization    
Property and equipment, gross 825 798
Leasehold improvements    
Property, equipment and depreciation and amortization    
Property and equipment, gross 1,962 1,962
Laboratory equipment    
Property, equipment and depreciation and amortization    
Property and equipment, gross $ 853 $ 868