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Inventory
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventory Inventories
Inventories as of June 30, 2018 and December 31, 2017 consisted of the following:

($ in thousands)June 30, 2018December 31, 2017
Raw materials$9,127 $5,754 
Work-in-process3,740 7,732 
Finished goods4,742 3,728 
Inventories$17,609 $17,214