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Significant Accounting Policies - Schedule of Inventory (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Raw materials | $ 160 | $ 144
Work-in-process | 440 | 375
Finished goods | 44 | 129
Inventory | 644 | 648
Inventory reserve | (255) | (50)
Total inventory, net of reserve | $ 389 | $ 598

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