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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory    
Raw materials $ 1,822 $ 481
Work-in-process 4,097 3,488
Finished goods 5,086 6,436
Total inventories 11,005 10,405
Inventories - current 7,129 6,967 [1]
Inventories-noncurrent $ 3,876 $ 3,438 [1]
[1] The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.