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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]      
Raw materials $ 328 $ 346 $ 360
Work-in-process 660 214 251
Finished goods 176 100 146
Total inventories $ 1,164 $ 660 $ 757