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Summary of Significant Accounting Policies - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Net [Abstract]    
Raw materials $ 14,425 $ 14,092
Work in process 838 544
Finished goods 9,777 8,252
Inventories $ 25,040 $ 22,888