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Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 4,610 $ 3,408
Work in process 4,800 4,054
Finished goods 9,630 5,711
Inventory, net $ 19,040 $ 13,173