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Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 8,709 $ 7,044
Work in process 11,597 10,844
Finished goods 23,655 12,372
Inventory 43,961 30,260
Inventory reserve (288)  
Inventory, net $ 43,673 $ 30,260