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Balance Sheet Components -Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 9,797   $ 9,788
Less: Accumulated depreciation (8,773)   (8,724)
Property and equipment, net 1,024   1,064
Depreciation (less than $0.1 million for both periods) 48 $ 80  
Machinery, equipment, furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 4,443   4,434
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 2,952   2,952
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 2,402   $ 2,402