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Details of Certain Financial Statement Components (Tables)

3 Months Ended

Mar. 31, 2022

Details of Certain Financial Statement Components

Schedule of inventories

​

​	​	​	​	​	​	​
​	​	March 31,		​	December 31,
​		2022			2021
Inventories		(in thousands)
Raw materials		$	459		$	447
Work-in-process	​	​	201	​	​	209
Finished goods	​	​	139	​	​	159
Total inventories		$	799		$	814

Schedule of property, plant and equipment, net

​

​	​	​	​	​	​	​
​	​	March 31,		​	December 31,
​		2022			2021
Property, plant and equipment, net	​	(in thousands)
Furniture, machinery and equipment	​	$	1,702	​	$	1,696
Leasehold improvements	​		445	​		444
​	​		2,147	​		2,140
Less: accumulated depreciation	​		(1,857)	​		(1,802)
Total property, plant and equipment, net	​	$	290	​	$	338

Schedule of intangible assets, net

​

​	​	​	​	​	​	​
​	​	March 31,		​	December 31,
​		2022			2021
Intangible assets, net	​	(in thousands)
Patents and trademarks	​	$	658	​	$	658
Less: accumulated amortization	​		(542)	​		(527)
Total intangible assets, net	​	$	116	​	$	131

Schedule of future amortization on existing intangibles

​

​	​	​	​
Years ending December 31,		(in thousands)
2022 (remainder of year)	​	$	40
2023	​		42
2024	​		27
2025	​		7
​	​	$	116

Schedule of accrued liabilities

​

​	​	​	​	​	​	​
​	​	March 31,		​	December 31,
​		2022			2021
Accrued Liabilities	​	(in thousands)
Accrued wages and benefits	​	$	113	​	$	402
Accrued vacation	​		96	​		82
Other accrued liabilities	​		24	​		23
Total accrued liabilities	​	$	251	​	$	507

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

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