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Inventory
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventory Inventory
Our inventory, net of allowance for obsolescence of  $19,000 at March 31, 2019 and December 31, 2018, respectively, consisted of the following amounts:
March 31, 2019December 31, 2018
(in thousands)
Raw materials - current
$29,821 $26,152 
Raw materials - long term, net3,997 3,980 
Finished Goods1,022 1,022 
Work in process
4,656 3,800 
$39,496 $34,954 

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 three months ended March 31, 2019 and 2018, there were no write-offs of obsolete inventory against the allowance for obsolescence.