Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

The income tax provision consisted of the following (in thousands):

Significant components of the Company’s deferred tax assets and liabilities were (in thousands):


	December 31,
	2016		2015
Deferred tax assets:
Federal and state loss carryforwards	$	68,829	$	60,831
Reserves, accruals and other		519		761
Depreciation and amortization		1,718		1,304
Deferred stock-based compensation		4,287		4,504
Research and development credit carryforwards		13,867		12,886
Foreign tax and other credits		536		1,131
Total deferred tax assets		89,756		81,417
Deferred tax liabilities:
Acquired intangible assets and other		328		1,781
Less: Valuation allowance		(89,428)		(79,636)
Net deferred tax assets	$	—	$	—

A reconciliation of income taxes provided at the federal statutory rate (35%) to the actual income tax provision follows (in thousands):


	Year Ended December 31,
	2016		2015		2014
Income tax benefit computed at U.S. statutory rate	$	(11,229)	$	(10,989)	$	(11,401)
State income tax (net of federal benefit)		3		3		3
Foreign income tax at rate different from U.S. statutory rate		(7)		(15)		(12)
Research and development credits		(981)		(1,580)		(1,614)
Stock-based compensation		75		123		130
Amortization of intangible assets		(100)		(100)		(100)
Goodwill impairment		1,856		—		—
Valuation allowance changes affecting tax provision		10,022		12,588		13,027
Other		406		56		74
Income tax provision	$	45	$	86	$	107

The domestic and foreign components of (loss) income before income tax provision were (in thousands):