Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Components of Tax Benefit (Provision) Allocated to Continuing Operations

Components of tax benefit (provision) allocated to continuing operations include the following:

	Year Ended			Year Ended
	December 31,			December 31,
	2021			2020
Current:
Federal	$	—		$	16
State		(7	)		(9	)
Foreign		(9	)		(8	)
Sub-total	$	(16	)	$	(1	)
Deferred:
Federal	$	—		$	—
State		—			—
Foreign		—			—
Sub-total	$	—		$	—
Total tax benefit (provision)	$	(16	)	$	(1	)

Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate

The reconciliation of the statutory federal income tax rate to the Company’s effective income tax rate is as follows:

	Year Ended						Year Ended
	December 31,						December 31,
	2021			%			2020			%
Income taxes computed at statutory rates	$	7,296			(21	)%	$	6,832			(21	)%
(Increases) decreases resulting from:
Change in valuation allowance		(8,634	)		24	%		(7,830	)		24	%
Federal and state research and experimentation credits		787			(2	)%		947			(3	)%
State income taxes, net of federal tax benefit		414			(1	)%		451			(1	)%
Other		121			—	%		(401	)		1	%
Total	$	(16	)		—	%	$	(1	)		—	%

Components of Deferred Tax Assets and Deferred Tax Liabilities

The tax effects of significant items comprising the Company’s deferred tax assets and deferred tax liabilities are as follows:

	Year Ended			Year Ended
	December 31,			December 31,
	2021			2020
Deferred tax assets:
Federal and state net operating losses	$	55,481		$	47,442
Federal and state research and experimentation credits		9,789			9,152
ASC 842 - lease liabilities		393			524
Stock based compensation		217			158
Deferred social security tax		116			212
Goodwill		97			154
Other		107			128
Total gross deferred tax assets		66,200			57,770
Less valuation allowance		(64,273	)		(55,639	)
Net deferred tax assets	$	1,927		$	2,131
Deferred tax liabilities:
Patent expenditures	$	(1,475	)	$	(1,433	)
ASC 842 - right of use assets		(288	)		(386	)
Fixed asset differences		(164	)		(312	)
Total gross deferred tax liabilities	$	(1,927	)	$	(2,131	)
Total net deferred tax assets and liabilities	$	—		$	—

Summary of Reconciliation of Uncertain Tax Positions

A summary reconciliation of the Company’s uncertain tax positions is as follows:

	Year Ended		Year Ended
	December 31,		December 31,
	2021		2020
Beginning balance	$	823	$	676
Addition for current year tax positions		84		92
Addition for prior year tax positions		11		55
Reduction for prior year positions		—		—
Reduction for prior year positions resolved during the current year		—		—
Ending balance	$	918	$	823