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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Net [Abstract]    
Raw materials $ 15,794 $ 15,819
Work in process 5,983 6,098
Finished goods 574 807
Obsolescence allowance (2,692) (1,907)
Total inventories $ 19,659 $ 20,817