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Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw material $ 957 $ 819
Work-in-process 8,671 8,142
Finished goods [1] 6,864 33,784
Supplies 728 1,431
Total inventories 17,220 44,176
Inventory fair value adjustments $ 0 $ 30,400
[1] The amount shown above includes the unamortized fair value adjustment of $0.0 million and $30.4 million at September 30, 2016 and December 31, 2015, respectively.