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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw material $ 76 $ 229
Work in progress 6,891 12,758
Finished goods 596 451
Spare parts 102 61
Total inventory 7,665 13,499
Less: current portion $ 7,665 10,344
Total inventory, net of current portion   $ 3,155