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Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 12,578 $ 12,418
Work in process 5,417 4,146
Finished goods 13,603 20,792
Total inventories 31,598 $ 37,356
Decrease in total inventories $ 5,800