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Inventory (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Our inventory, net of allowance for obsolescence of $20,785 and $15,000 at March 31, 2018 and December 31, 2017, respectively, consisted of the following amounts:
 
March 31, 2018
 
December 31, 2017
 
(in thousands)
Raw materials - current
$
21,482

 
$
22,813

Raw materials - long term
3,315

 
2,829

Finished Goods
1,022

 
1,022

Work in process
3,245

 
2,389

 
$
29,064

 
$
29,053