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Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Inventory, finished goods, trial and evaluation, gross $ 1,700 $ 1,400
Raw materials 19,942 20,119
Finished goods 19,279 25,346
Total inventory $ 39,221 $ 45,465