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Inventory (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Our inventory, net of allowance for obsolescence of $20,785 and $15,000 at June 30, 2018 and December 31, 2017, respectively, consisted of the following amounts:

June 30, 2018December 31, 2017
(in thousands) 
Raw materials - current$19,565 $22,813 
Raw materials - long term3,467 2,829 
Finished Goods1,022 1,022 
Work in process 2,455 2,389 
$26,509 $29,053