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Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory    
Raw materials $ 674 $ 481
Work-in-process 6,511 3,488
Finished goods 6,133 6,436
Total inventories 13,318 10,405
Inventories - current 7,365 6,967
Inventories-noncurrent $ 5,953 $ 3,438