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Inventories - Components of inventory (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |  |
Raw materials | $ 7,190 | $ 4,339 |
Finished goods | 15,705 | 24,569 |
Inventories | 22,895 | 28,908 |
Less reserve for excess and obsolete inventory | (11,058) | (5,698) | $ (2,117)
Inventories, net | $ 11,837 | $ 23,210 |

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