Quarterly report pursuant to Section 13 or 15(d)

Components of Inventory (Detail)

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Components of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Components of inventory, net of allowances    
Raw materials $ 4,810 $ 4,837
Work-in-process 1,676 2,261
Finished goods 7,616 6,425
Inventory, net $ 14,102 $ 13,523