Details of Certain Financial Statement Components (Tables)

3 Months Ended

Mar. 31, 2023

Details of Certain Financial Statement Components

Schedule of inventories

	March 31,		December 31,
	2023		2022
Inventories	(in thousands)
Raw materials	$	2,531	$	1,635
Work-in-process		242		192
Finished goods		203		285
Total inventories	$	2,976	$	2,112

Schedule of property, plant and equipment, net

	March 31,		December 31,
	2023		2022
Property, plant and equipment, net	(in thousands)
Furniture, machinery and equipment	$	1,857	$	1,688
Leasehold improvements		420		417
		2,277		2,105
Less: accumulated depreciation		(1,968)		(1,921)
Total property, plant and equipment, net	$	309	$	184

Schedule of intangible assets, net

	March 31,		December 31,
	2023		2022
Intangible assets, net	(in thousands)
Patents and trademarks	$	658	$	658
Less: accumulated amortization		(594)		(582)
Total intangible assets, net	$	64	$	76

Schedule of future amortization on existing intangibles

Years ending December 31,	(in thousands)
2023 (remainder of year)	$	30
2024		27
2025		7
2026		—
2027		—
Thereafter		—
	$	64

Schedule of accrued liabilities

	March 31,		December 31,
	2023		2022
Accrued liabilities	(in thousands)
Accrued wages and benefits	$	177	$	320
Accrued vacation		228		223
Other accrued liabilities		125		25
Total accrued liabilities	$	530	$	568