Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Schedule of inventories

	March 31, 2021		December 31, 2020
	(in thousands)
Raw materials	$	468	$	468
Work-in-process		452		614
Finished goods		594		459
	$	1,514	$	1,541

Schedule of property and equipment

	March 31, 2021			December 31, 2020
	(in thousands)
Machinery, equipment and tooling	$	3,343		$	3,343
Buildings		1,711			1,711
Information systems		835			835
Land and land improvements		594			594
Furniture and fixtures		8			8
Total cost		6,491			6,491
Accumulated depreciation and amortization		(4,050	)		(4,009	)
Property and equipment, net	$	2,441		$	2,482