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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories as of September 30, 2018 and December 31, 2017 consisted of the following:
($ in thousands) September 30, 2018December 31, 2017
Raw materials $14,972 $5,754 
Work-in-process 3,015 7,732 
Finished goods 3,543 3,728 
Inventories $21,530 $17,214