Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Summary of (loss) before income taxes

	Year ended December 31,
	2020			2019
	(in thousands)
U.S.	$	(3,060	)	$	(1,142	)
Foreign		2,018			17
Total	$	(1,050	)	$	(1,125	)

Summary of income tax expense (benefit)

	Year ended December 31,
	2020		2019
	(in thousands)
Current
U.S.	$	—	$	—
State		—		—
Foreign		13		22
Total current income tax expense		13		22
Deferred
U.S.		—		—
State		—		—
Foreign		—		—
Total deferred income tax expense (benefit)		—		—
Total income tax expense (benefit)	$	13	$	22

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

	Year ended December 31,
	2020			2019
U.S. federal statutory rate		(21.0	)%		(21.0	)%
State taxes net of federal benefit		(18.2	)		(7.6	)
Foreign rate differential and transactional tax		5.9			0.1
Tax credits		—			—
Valuation allowance		33.3			28.5
Other		1			2.0
		1.0	%		2.0	%

Summary of significant components of net deferred income taxes

	2020			2019
	(in thousands)
Deferred tax assets:
Allowance for doubtful accounts	$	1		$	11
Inventory reserves		3,096			3,185
Consumables excess reserve		167			169
Accrued liabilities		81			52
Warrant interest expense		195			196
Stock compensation expense		789			789
State net operating loss		14,476			15,010
Net operating loss carryforward		41,105			40,437
Tax credits		710			740
Depreciation		1,000			1,329
Valuation allowance		(61,556	)		(61,869	)
Total deferred tax assets		64			49
Deferred tax liability:
Prepaid expenses		(64	)		(49	)
Net deferred tax liability	$	—		$	—