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Inventories - Components of Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Work-in-process $ 21,926 $ 20,219
Finished goods 33,935 54,502
Total 55,861 74,721
Less: Inventories - current (15,711) (15,718)
Inventories - non-current $ 40,150 $ 59,003