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Discontinued Operations - Major Components Comprising Loss from Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Operating expenses        
Net loss from discontinued operations $ 0 $ (2,834) $ 0 $ (4,056)
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net revenue   380   1,029
Cost of sales   848   2,044
Inventory write-down   839   839
Gross profit   (1,307)   (1,854)
Operating expenses        
Sales and marketing   387   518
Research and development   18   20
General and administrative   213   736
Restructuring costs   534   534
Share-based compensation   5   21
Depreciation and amortization   5   13
Impairment loss on long-lived assets   205   205
Total operating expenses   1,367   2,047
Interest income   3   8
Other, net   (163)   (163)
Total other income (loss)   (160)   (155)
Loss before income taxes   (2,834)   (4,056)
Income tax expense (benefit)   0   0
Net loss from discontinued operations   (2,834)   (4,056)
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment | Facility in Los Angeles, California        
Operating expenses        
Impairment loss on long-lived assets   $ 205   $ 205