Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Benefit Attributable to Our Loss from Operations

Income tax benefit attributable to our loss from operations before income taxes differs from the amounts computed by applying the U.S. federal statutory income tax rate of 21% for 2019 and 2018, as a result of the following (in thousands):

	Years ended December 31,
	2019			2018
U.S. federal income tax benefit at statutory rates	$	(1,151	)	$	(1,666	)
State income tax benefit, net of federal benefit		(201	)		(290	)
Research and experimentation credits		(31	)		(144	)
Deferred tax asset adjustment		3			34
Other		115			134
Change in valuation allowance		1,098			1,901
Income tax benefit	$	(167	)	$	(31	)

Net Deferred Tax Assets

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting and the amounts used for income tax purposes, as well as operating loss and tax credit carryforwards. The income tax effects of temporary differences and carryforwards that give rise to significant portions of the Company’s net deferred tax assets consisted of the following (in thousands):

	As of December 31,
	2019			2018
Net operating loss carryforwards	$	41,989		$	40,742
Charitable contribution carryforwards		439			433
Research and experimentation credits		1,668			1,796
Capitalized intangibles		387			409
Stock-based compensation		119			127
Depreciation and amortization		—			1
Accrued compensation		16			20
Other		9			1
Total deferred tax assets		44,627			43,529
Valuation allowance		(44,627	)		(43,529	)
Net deferred tax assets	$	—		$	—