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Inventory (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventory
Our inventory, net of allowance for obsolescence of $37,000 at March 31, 2022 and $64,000 at December 31, 2021, consisted of the following amounts:
March 31, 2022December 31, 2021
(in thousands)
Raw materials - current$16,213 $17,528 
Work-in-process1,118 1,801 
Inventory - current17,331 19,329 
Raw materials - long term (net of allowances of $37 and $64, respectively)
1,495 1,582 
Inventory - total$18,826 $20,911 
A summary of our inventory allowance is as follows:

March 31, 2022December 31, 2021
(in thousands)
Beginning balance$64 $221 
Accruals— 208 
Write-offs(27)(365)
Ending balance$37 $64