Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of loss before income taxes, domestic and foreign

Our loss before provision for income taxes was as follows (in thousands):

	Years Ended December 31,
	2014			2013			2012
United States	$	(20,980	)	$	(41,696	)	$	(30,743	)
Foreign	1,653			306			156
Loss before provision for income taxes	$	(19,327	)	$	(41,390	)	$	(30,587	)

Components of provision for income taxes

The components of the provision for income taxes are as follows (in thousands):

	Years Ended December 31,
	2014			2013			2012
Current provision (benefit):
Federal	$	—		$	—		$	—
State	5			5			7
Foreign	(371		)	(45		)	178
Total current provision	(366		)	(40		)	185
Deferred provision (benefit):
Federal	—			(59		)	(62		)
State	—			(7		)	(7		)
Foreign	110			19			154
Total deferred provision	110			(47		)	85
Total provision for (benefit from) income taxes	$	(256	)	$	(87	)	$	270

Reconciliation of provision for income taxes calculated at the statutory rate to provision for income taxes

Reconciliation of the provision for income taxes calculated at the statutory rate to our provision for (benefit from) income taxes is as follows (in thousands):

	Years Ended December 31,
	2014			2013			2012
Tax benefit at federal statutory rate	$	(6,571	)	$	(14,073	)	$	(10,399	)
State taxes	249			(1,948		)	(1,063		)
Research and development credits	(57		)	(195		)	—
Foreign operations taxed at different rates	447			(108		)	7
Stock-based compensation	(2		)	117			312
Other nondeductible items	(364		)	(1,272		)	204
Change in federal statutory rate	—			—			1,493
Change in valuation allowance	6,042			17,392			9,716
Provision for (benefit from) income taxes	$	(256	)	$	(87	)	$	270

Significant components of our deferred tax assets and liabilities

Significant components of our deferred tax assets and liabilities are as follows (in thousands):

	December 31,
	2014			2013
Deferred tax assets:
Net operating losses	$	70,666		$	67,507
Credits	4,421			4,194
Deferred revenues	2,697			1,198
Stock-based compensation	2,988			3,043
Reserves and accruals	2,701			3,626
Depreciation	2,295			2,247
Intangible assets	4,639			4,208
Capital losses	933			—
Unrealized gain/loss	148			112
Other assets	101			159
Total deferred tax assets:	91,589			86,294
Deferred tax liabilities:
Other	(186		)	—
Total deferred tax liabilities:	(186		)	—
Valuation allowance	(91,513		)	(86,294		)
Net deferred tax liabilities	$	(110	)	$	—

Summary of federal, state and foreign NOL carryforwards and federal research and development tax credits

The following table sets forth the Company's federal, state and foreign NOL carryforwards and federal research and development tax credits as of December 31, 2014 (in thousands):

	December 31, 2014
	Amount		Expiration Years
Net operating losses, federal	$	196,941	2022-2034
Net operating losses, state	146,916		2015-2034
Tax credits, federal	5,141		2022-2034
Tax credits, state	5,975		Do not expire
Net operating losses, foreign	3,241		Various
Tax credits, foreign	$	16	Various

Reconciliation of the beginning and ending amount of unrecognized tax benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):

	December 31,
	2014			2013			2012
Balance at beginning of year	$	8,306		$	7,429		$	6,611
Additions based on tax positions related to current year	346			1,116			718
Additions to tax provision of prior years	—			6			316
Reductions to tax provision of prior years	(814		)	(87		)	(29		)
Lapse of the applicable statute of limitations	—			(158		)	(187		)
Balance at end of year	$	7,838		$	8,306		$	7,429