Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2022

Accounting Policies [Abstract]

Schedule of inventories

	March 31, 2022		December 31, 2021
	(in thousands)
Raw materials	$	457	$	468
Work-in-process		323		328
Finished goods		288		330
	$	1,068	$	1,126

Schedule of property and equipment

	March 31, 2022			December 31, 2021
	(in thousands)
Machinery, equipment and tooling	$	3,296		$	3,296
Buildings		1,711			1,711
Information systems		819			819
Land and land improvements		594			594
Furniture and fixtures		7			7
Total cost		6,427			6,427
Accumulated depreciation and amortization		(4,156	)		(4,126	)
Property and equipment, net	$	2,271		$	2,301