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Balance Sheet Account Detail - Property and Equipment, Net of Accumulated Depreciation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Property and equipment, at cost $ 747   $ 747   $ 682
(Less): Accumulated depreciation and amortization 266   266   134
Property and equipment, net of accumulated depreciation and amortization 481   481   548
Depreciation 125 $ 17 189 $ 32  
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Property and equipment, at cost 365   365   294
Office equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, at cost 52   52   74
Lab equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, at cost 167   167   173
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, at cost $ 163   $ 163   $ 141