Details of Certain Financial Statement Components (Tables)

9 Months Ended

Sep. 30, 2021

Details of Certain Financial Statement Components

Schedule of inventories

	September 30,		December 31,
	2021		2020
Inventories	(in thousands)
Raw materials	$	473	$	520
Work-in-process		204		246
Finished goods		130		100
Total inventories	$	807	$	866

Schedule of property, plant and equipment, net

	September 30,		December 31,
	2021		2020
Property, plant and equipment, net	(in thousands)
Furniture, machinery and equipment	$	1,680	$	1,662
Leasehold improvements		429		538
		2,109		2,200
Less: accumulated depreciation		(1,737)		(1,793)
Total property, plant and equipment, net	$	372	$	407

Schedule of intangible assets, net

	September 30,		December 31,
	2021		2020
Intangible assets, net	(in thousands)
Patents and trademarks	$	658	$	658
Less: accumulated amortization		(512)		(463)
Total intangible assets, net	$	146	$	195

Schedule of future amortization on existing intangibles

Years ending December 31,	(in thousands)
2021 (remainder of year)	$	16
2022		54
2023		42
2024		27
2025		7
Thereafter		—
	$	146

Schedule of accrued liabilities

	September 30,		December 31,
	2021		2020
Accrued liabilities	(in thousands)
Accrued warranty	$	7	$	7
Accrued wages and benefits		348		180
Accrued vacation		77		110
Accrued other		20		46
Total accrued liabilities	$	452	$	343