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Inventory (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 4,875 $ 7,044
Work in process 13,466 10,844
Finished goods 17,077 12,372
Inventory 35,418 30,260
Inventory reserve (314)  
Inventory, net $ 35,104 $ 30,260