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Inventory - Schedule of Inventory (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 6,573 | $ 14,142
Work in process | 3,845 | 8,590
Finished goods | 36,008 | 35,357
Total inventory, gross | 46,426 | 58,089
Inventory cost adjustment | (158) | (287)
Inventory | $ 46,268 | $ 57,802

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