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, 2018
Dec. 31, 2017
Components of inventory, net of allowances    
Raw materials $ 3,860 $ 3,953
Work-in-process 1,471 1,162
Finished goods 8,092 7,183
Inventory, net $ 13,423 $ 12,298