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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw material $ 298 $ 229
Work in progress 7,825 12,758
Finished goods 832 451
Spare parts 137 61
Total inventory 9,092 13,499
Less: current portion $ 9,092 10,344
Total long-term inventory, net of current portion   $ 3,155