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Inventories - Components of Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Work-in-process $ 26,127 $ 22,579
Finished goods 24,951 27,247
Total 51,078 49,826
Less: Inventories - current (19,120) (15,886)
Inventories - non-current $ 31,958 $ 33,940