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Inventories - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Finished goods $ 4,698 $ 2,704
Raw materials 3,185 4,630
Total inventories 7,883 7,334
Short-term portion $ 7,883 6,625
Long-term portion   $ 709