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Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
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