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Inventory (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Inventory, net |  |
Raw materials | $ 178 | $ 190
Work-in-progress | 88 | 22
Finished goods | 25 | 21
Inventory, Gross | 291 | 233
Less: Inventory reserve for excess and slow moving inventory | 0 | 0
Total | $ 291 | $ 233

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