Supplementary Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2022

Inventory Disclosure [Abstract]

Schedule of Inventory

The components of inventories are as follows (in thousands):

	March 31, 2022		December 31, 2021
Raw materials	$	7,167	$	5,870
Work-in-process	2,252		2,145
Finished goods	1,191		830
Total inventories	10,610		8,845
Less reserve for excess and obsolete inventories	(323)		(320)
Total inventories, net	$	10,287	$	8,525

Schedule of Property and Equipment

Property and equipment consist of the following (in thousands):

	March 31, 2022		December 31, 2021
Land	$	805	$	805
Buildings and leasehold improvements	4,832		4,823
Machinery and equipment	24,940		24,881
Computer hardware and software	2,387		2,387
Gross property and equipment	32,964		32,896
Accumulated depreciation	(24,111)		(23,978)
Total property and equipment, net	$	8,853	$	8,918

Schedule of Product Warranty Liability

The activities related to our warranty reserve for the quarter ended March 31, 2022 and year ended December 31, 2021 are as follows (in thousands):

	March 31, 2022		December 31, 2021
Balance at the beginning of year	$	569	$	214
Charges to cost of revenues	26		963
Applied to liability	(175)		(608)
Balance at the end of period	$	420	$	569