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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]    
Depreciation expense $ 100 $ 100
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 370 349
Accumulated depreciation (313) (249)
Property and equipment, net 57 100
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 26 26
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 254 247
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 90 $ 76