Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 14,972 $ 5,754
Work-in-process 3,015 7,732
Finished goods 3,543 3,728
Inventories $ 21,530 $ 17,214