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Inventories - Components of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Work-in-process $ 16,128 $ 20,219
Finished goods 52,132 54,502
Total 68,260 74,721
Less: Inventories - current (25,306) (15,718)
Inventories - non-current $ 42,954 $ 59,003