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Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 14,142 $ 7,044
Work in process 8,590 10,844
Finished goods 35,357 12,372
Total inventory, gross 58,089 30,260
Inventory cost adjustment (287)  
Inventory $ 57,802 $ 30,260