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Inventories, Net - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 20,461 $ 12,111
Work-in-process 17,409 6,562
Finished goods 1,486 349
Total $ 39,356 $ 19,022