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Inventory
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventory 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 

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.

Inventory Allowance

We routinely review our inventory allowance balance to account for slow moving or obsolete inventory costs that may not be recoverable in the future.
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)