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Inventories (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 11,285 $ 9,505
Work in process 1,380 4,146
Finished goods 18,009 20,792
Total inventories 30,674 $ 34,443
Decrease in total inventories $ 3,800