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Inventory

3 Months Ended

Mar. 31, 2021

Our inventory, net of allowance for obsolescence of $37,000 at March 31, 2021 and $221,000 at December 31, 2020, consisted of the following amounts:


	March 31, 2021		December 31, 2020
	(in thousands)
Raw materials - current	$	18,619	$	18,026
Work-in-process	1,363		1,900
Inventory - current	19,982		19,926
Raw materials - long term (net of allowances of $37 and $221, respectively)	1,105		1,065
Inventory - total	$	21,087	$	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

Due to the slow moving nature or obsolescence of a portion of its long-term inventory and inventory related to the periodic retirement of rental equipment, the Company routinely reviews its inventory allowance balance for costs that may not be recoverable in the future.

A summary of our inventory allowance is as follows:


	March 31, 2021		December 31, 2020
	(in thousands)
Beginning balance	$	(221)	$	(24)
Accruals	—		(251)
Write-offs	184		54
Ending balance	$	(37)	$	(221)