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Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Raw materials $ 1,766 $ 481
Work-in-process 6,929 3,488
Finished goods 3,998 6,436
Total inventories 12,693 10,405
Inventories - current 6,527 6,967
Inventories-noncurrent $ 6,166 $ 3,438