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Inventory (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory
Our inventory, net of allowance for obsolescence of $37,000 at September 30, 2021 and $221,000 at December 31, 2020, consisted of the following amounts:
September 30, 2021December 31, 2020
(in thousands)
Raw materials - current$20,381 $18,026 
Work-in-process1,011 1,900 
Inventory - current21,392 19,926 
Raw materials - long term (net of allowances of $37 and $221, respectively)
1,250 1,065 
Inventory - total$22,642 $20,991 
A summary of our inventory allowance is as follows:

September 30, 2021December 31, 2020
(in thousands)
Beginning balance$(221)$(24)
Accruals— (251)
Write-offs184 54 
Ending balance$(37)$(221)