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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Inventory Net [Abstract] |  |
Raw materials | $ 19,871 | $ 17,889
Work in process | 2,886 | 3,986
Finished goods | 1,269 | 1,508
Obsolescence allowance | (2,095) | (1,896)
Inventory, net | $ 21,931 | $ 21,487

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