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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Net [Abstract]    
Raw materials $ 17,866 $ 17,889
Work in process 4,142 3,986
Finished goods 1,554 1,508
Obsolescence allowance (2,064) (1,896)
Inventory, net $ 21,498 $ 21,487