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Inventory
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventory Inventory
Our inventory, net of allowance for obsolescence of $20,785 and $15,000 at September 30, 2018 and December 31, 2017, respectively, consisted of the following amounts:
September 30, 2018December 31, 2017
(in thousands)
Raw materials - current
$15,080 $22,813 
Raw materials - long term 3,815 2,829 
Finished Goods 1,022 1,022 
Work in process
2,963 2,389 
$22,880 $29,053 

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

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