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Property and Equipment - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 430 $ 370
Accumulated depreciation (368) (313)
Property and equipment, net 62 57
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 314 254
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 90 $ 90