Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

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 35%, as a result of the following (in thousands):

	Years ended December 31,
	2013			2012
U.S. federal income tax benefit at statutory rates		(2,429	)	$	(1,512	)
State income tax benefit, net of federal benefit		(209	)		(130	)
Research and experimentation credits		(133	)		—
Other		184			196
Change in valuation allowance		2,587			1,446
	$	—		$	—

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,
	2013			2012
Deferred tax assets:
Current deferred tax assets:
Vacation accrual	$	27		$	26
Total current deferred tax assets		27			26
Valuation allowance		(27	)		(26	)
Net current deferred tax assets	$	—		$	—
Noncurrent deferred tax assets:
Net operating loss carryforwards	$	39,799		$	37,295
Charitable contribution carryforwards		371			368
Research and experimentation credits		820			687
Capitalized intangibles		3,351			3,413
Stock based compensation		454			416
Depreciation and amortization		5			11
Other		—			25
Total noncurrent deferred tax assets		44,800			42,215
Valuation allowance		(44,800	)		(42,215	)
Net noncurrent deferred tax assets	$	—		$	—
Deferred tax liabilities:
Current deferred tax liabilities	$	—		$	—
Noncurrent deferred tax liabilities		—			—
Net deferred tax liabilities	$	—		$	—
Net noncurrent deferred tax assets	$	—		$	—