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Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory    
Raw materials $ 481 $ 1,062
Work-in-process 4,944 8,615
Finished goods 5,993 4,771
Total inventories 11,418 14,448
Inventories - current 5,993 6,482 [1]
Inventories - non -current $ 5,425 $ 7,966 [1]
[1] The condensed consolidated balance sheet at December 31, 2017 has been derived from the audited financial statements at that date.