Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Significant components of the provision (benefit) for income taxes from continuing operations are as follows (in thousands):



	Year Ended December 31,
	2019		2018
Income tax expense at statutory federal rate	21.0	%	21.0	%
State income tax expense, net of federal benefit	0.3	%	1.7	%
Permanent differences and other	0.6	%	(4.6	)%
Transaction costs	(4.8	)%	—	%
Withholding costs	(0.3	)%	(0.8	)%
Tax credit	—	%	(0.1	)%
Impact of 2017 Tax Act	—	%	—	%
Change in effective federal and state tax rates	0.3	%	(2.0	)%
Expiration of net operating loss and tax credit carryovers	(43.5	)%	—	%
Stock compensation expense	—	%	(2.4	)%
Reserve for uncertain tax positions and other reserves	12.7	%	—	%
Change in valuation allowance	20.8	%	16.1	%
Provision for income taxes	7.1	%	28.9	%

Our net deferred tax assets consisted of the following (in thousands):



	December 31,
	2019			2018
Deferred tax assets:
Net operating loss carryforwards	$	23,929		$	22,043
Research and development and other credits	72			72
Reserves	402			336
Operating lease liability	1,265			—
Interest Carryover	192			—
Other, net	1,263			1,013
Total deferred tax assets	27,123			23,464
Deferred tax liabilities:
Right of use asset	(1,236		)	—
Fixed assets and other	(2,167		)	(2,588		)
Intangibles	(4,597		)	(756		)
Total deferred tax liabilities	(8,000		)	(3,344		)
Valuation allowance for deferred tax assets	(19,146		)	(20,241		)
Net deferred tax liabilities	$	(23	)	$	(121	)

The following table summarizes the activity related to our unrecognized tax benefits (in thousands):



	December 31,
	2019			2018
Balance at beginning of year	$	3,610		$	3,936
Expiration of the statute of limitations for the assessment of taxes	(669		)	(326		)
Balance at end of year	$	2,941		$	3,610