Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Schedule of income taxes

	Year Ended
	December 31,
	2022		2021
	(in thousands)
Current
U.S.	$	—	$	—
State		—		—
Total current income tax expense		—		—
Deferred
U.S.		—		—
State		—		—
Total deferred income tax expense (benefit)		—		—
Total income tax expense (benefit)	$	—	$	—

Schedule of reconciliation of income tax computed at the federal statutory rate to income before taxes

	Year Ended
	December 31,
	2022			2021
U.S. federal statutory rate		(21.0	)%		(21.0	)%
State taxes net of federal benefit		(5.4	)		(6.9	)
Valuation allowance		26.4			27.9
		—	%		—	%

Schedule of significant components of the Company’s net deferred income taxes

	2022			2021
	(in thousands)
Deferred tax assets:
Allowance for doubtful accounts	$	5		$	5
Inventory reserves		2,928			3,033
Consumables excess reserve		162			162
Accrued liabilities		15			155
Warrant interest expense		195			195
Stock compensation expense		706			775
State net operating loss		13,425			13,358
Net operating loss carryforward		39,759			39,597
Capital loss carryforward					6,755
Tax credits		669			669
Depreciation		219			423
Valuation allowance		(58,068	)		(65,079	)
Total deferred tax assets		15			47
Deferred tax liability:
Prepaid expenses		(15	)		(47	)
Net deferred tax liability	$	—		$	—