Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of Accounts receivable for continuing operations and discontinued operations

	Year Ended
	December 31,
	2022			2021
	(in thousands)
Continuing Operations:
Trade receivables	$	683		$	732
Allowance for doubtful accounts		(6	)		(7	)
Discontinued Operations:
Trade receivables		6			6
Allowance for doubtful accounts		(12	)		(12	)
Balance of accounts receivable, net	$	671		$	719

Schedule of inventories

	As of
	December 31,
	2022		2021
	(in thousands)
Raw materials	$	367	$	468
Work-in-process		379		328
Finished goods		229		330
	$	975	$	1,126

Schedule of property and equipment

	As of
	December 31,
	2022			2021
	(in thousands)
Machinery, equipment and tooling	$	3,263		$	3,296
Buildings		1,711			1,711
Information systems		819			819
Land and land improvements		594			594
Furniture and fixtures		7			7
Total cost		6,394			6,427
Accumulated depreciation and amortization		(4,212	)		(4,126	)
Property and equipment, net	$	2,182		$	2,301

Schedule of estimated useful lives

Asset description	Life
Buildings	39 years
Machinery, equipment and tooling	3-10 years
Furniture and fixtures	7 years
Information systems	3 years

Schedule of product warranty liability

	Year Ended
	December 31,
	2022			2021
	(in thousands)
Balance, beginning of period	$	1		$	1
Charged to cost of sales		(16	)		(9	)
Actual product warranty expenditures		16			9
Balance, end of period	$	1		$	1

Schedule of net proceeds from the loan

	Proceeds From Mortgage Loan
	(in thousands)
Initial loan amount	$	1,620
Loan costs		(22	)
Escrow funding for property tax		(38	)
Net proceeds from mortgage loan	$	1,560

Schedule of future maturities of long-term debt

	December 31, 2022			December 31, 2021
	(in thousands)
Mortgage note	$	1,611		$	—
Unamortized loan costs		(20	)		—
Total debt		1,591			—
Less: short-term portion		25			—
Long-term portion	$	1,566		$	—

Schedule of debt obligations

	December 31, 2022		December 31, 2021
	(in thousands)
Interest expense	$	37	$	—
Amortization of loan costs		2		—
Total interest expense	$	39	$	—

Schedule of future maturities of long-term debt

	Principal Portion of Payment		Amort. Of Loan Costs			Debt, Net of Unamortized Loan Costs
	(in thousands)
2023	$	29	$	(4	)	$	25
2024		31		(4	)		27
2025		33		(4	)		29
2026		35		(4	)		31
2027		1,483		(4	)		1,479
Total	$	1,611	$	(20	)	$	1,591