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Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Inventory, finished goods, trial and evaluation, gross $ 1,400 $ 1,400
Raw materials 21,096 19,670
Finished goods 19,570 14,093
Total inventory $ 40,666 $ 33,763