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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw material $ 264 $ 229
Work in progress 8,398 12,758
Finished goods 474 451
Spare parts 55 61
Total inventory 9,191 13,499
Less: current portion 9,080 10,344
Total inventory, net of current portion $ 111 $ 3,155