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Inventory - Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 1,802 $ 1,796
Work-in-process 9,339 4,843
Finished goods 2,155 4,087
Total inventory $ 13,296 $ 10,726