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Inventory (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current assets |  |
Finished goods | $ 1,320 | $ 1,140
Total inventory, current | 1,320 | 1,140
Non-Current assets |  |
Raw materials | 659 | 659
Work-in-process | 949 | 1,109
Finished goods | 934 | 1,056
Total inventory, non-current | 2,542 | 2,824
Total inventory | $ 3,862 | $ 3,964

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