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Consolidated Balance Sheet Detail - Schedule of Inventories/Prepaid/PP&E (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventories: |  |
Work-in-process | $ 414 | $ 746
Finished goods | 185 | 222
Total | 599 | 968
Prepaid expenses and other: |  |
Prepaid inventory and production costs | 422 | 174
Prepaid insurance | 144 | 122
Prepaid software | 18 | 24
Refundable tax |  | 61
Other | 84 | 91
Total | 668 | 472
Property and equipment, net: |  |
Property and equipment, gross | 4,394 | 4,362
Less: Accumulated depreciation and amortization | (4,273) | (4,165)
Property and equipment, net | 121 | 197
Equipment, furniture and fixtures and leasehold improvements |  |
Property and equipment, net: |  |
Property and equipment, gross | 4,265 | 4,239
Acquired software |  |
Property and equipment, net: |  |
Property and equipment, gross | $ 129 | $ 123

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