Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2016			2015			2014
United States	$	(8,174	)	$	(7,641	)	$	(20,980	)
Foreign	(424		)	(278		)	1,653
Loss before provision for income taxes	$	(8,598	)	$	(7,919	)	$	(19,327	)

Components of provision for income taxes

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

	Years Ended December 31,
	2016			2015			2014
Current provision (benefit):
Federal	$	—		$	—		$	—
State	5			5			5
Foreign	(14		)	(13		)	(371		)
Total current provision (benefit)	(9		)	(8		)	(366		)
Deferred provision (benefit):
Federal	—			(293		)	—
State	—			(21		)	—
Foreign	(31		)	(16		)	110
Total deferred provision (benefit)	(31		)	(330		)	110
Total benefit from income taxes	$	(40	)	$	(338	)	$	(256	)

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,
	2016			2015			2014
Tax benefit at federal statutory rate	$	(2,924	)	$	(2,693	)	$	(6,571	)
State taxes	127			1,126			249
Research and development credits	(161		)	(85		)	(57		)
Foreign operations taxed at different rates	30			31			447
Stock-based compensation	327			77			(2		)
Other nondeductible items	660			(43		)	(364		)
Change in valuation allowance	1,901			1,249			6,042
Benefit from income taxes	$	(40	)	$	(338	)	$	(256	)

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,
	2016			2015
Deferred tax assets:
Net operating losses	$	72,588		$	70,005
Credits	5,016			4,671
Deferred revenues	1,025			3,357
Stock-based compensation	3,750			3,460
Reserves and accruals	2,952			2,713
Depreciation	2,516			2,377
Intangible assets	5,536			5,127
Capital losses	933			933
Unrealized gain/loss	277			126
Other assets	110			98
Total deferred tax assets:	94,703			92,867
Deferred tax liabilities:
Other	(103		)	(199		)
Total deferred tax liabilities:	(103		)	(199		)
Valuation allowance	(94,663		)	(92,762		)
Net deferred tax liabilities	$	(63	)	$	(94	)

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, 2016 (in thousands):

	December 31, 2016
	Amount		Expiration Years
Net operating losses, federal	$	213,061	2022-2036
Net operating losses, state	120,234		2017-2036
Tax credits, federal	5,634		2022-2036
Tax credits, state	7,048		Do not expire
Net operating losses, foreign	627		Various
Tax credits, foreign	10		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):

	Rollforward Table (at Gross): As of
	December 31,
	2016			2015			2014
Balance at beginning of year	$	8,152		$	7,838		$	8,306
Additions based on tax positions related to current year	459			368			346
Additions to tax provision of prior years	—			—			—
Reductions to tax provision of prior years	(45		)	(54		)	(814		)
Lapse of the applicable statute of limitations	—			—			—
Balance at end of year	$	8,566		$	8,152		$	7,838