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Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 10,107 $ 7,044
Work in process 10,810 10,844
Finished goods 19,592 12,372
Inventory 40,509 30,260
Inventory reserve (416)  
Inventory, net $ 40,093 $ 30,260