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Inventory
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventory 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 


Our long-term inventory consists of raw materials that remain viable but that the Company does not expect to sell within the year.

During the six months ended June 30, 2018 and 2017, there were no write-offs of obsolete inventory against the allowance for obsolescence.