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Certain Balance Sheet Items Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]    
Computer equipment, Gross $ 291 $ 291
Accumulated Depreciation and Amortization, Property, Plant, and Equipment (291) (289)
Property and Equipment, Net $ 0 $ 2