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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of Components of Loss before Income Taxes

The following table presents components of loss before income taxes for the periods presented (in thousands):

		Year Ended December 31,
		2016				2015				2014
United States		$	(12,222	)		$	(26,305	)		$	(37,657	)
International		416				528				(44		)
Loss before income taxes		$	(11,806	)		$	(25,777	)		$	(37,701	)

Schedule of Components of Provision for Income Taxes

Provision for income taxes for the periods presented consisted of (in thousands):

		Year Ended December 31,
		2016				2015				2014
Current:
U.S. federal		$	—			$	—			$	—
U.S. state		16				21				12
Foreign		38				40				73
Total provision for income taxes		$	54			$	61			$	85

Schedule of Effective Income Tax Amount Reconciliation

Income tax expense differed from the amounts computed by applying the U.S. federal income tax rate of 34% to pre-tax loss for the periods presented as a result of the following (in thousands):

		Year Ended December 31,
		2016				2015				2014
U.S. federal tax at statutory rate		$	(4,014	)		$	(8,764	)		$	(12,818	)
U.S. state income taxes		490				(756		)		(1,098		)
Non-deductible expenses		931				438				420
Research and development credit		(262		)		(440		)		(455		)
Stock-based compensation		983				737				746
Other		(104		)		481				(72		)
Change in valuation allowance		2,030				8,365				13,362
Total provision for income taxes		$	54			$	61			$	85

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to significant portions of the Company’s deferred tax assets and liabilities as of December 31, 2016 and 2015 related to the following (in thousands):    

		December 31,
		2016				2015
Deferred tax assets:
Net operating loss and credit carryforwards		$	48,533			$	45,671
Accrued liabilities		3,801				5,488
Allowance for doubtful accounts		429				394
Property and equipment		183				—
Deferred revenue		23				—
Accrued compensation		1,183				817
Intangibles		14				23
Gross deferred tax assets		54,166				52,393
Valuation allowance		(53,598		)		(51,568		)
Net deferred tax assets		568				825
Deferred tax liabilities:
Property and equipment		—				(71		)
Amortized intangibles		(568		)		(754		)
Gross deferred tax liabilities		(568		)		(825		)
Net deferred taxes		$	—			$	—

Schedule of Unrecognized Tax Benefits Rollforward

The table below shows the changes in the gross amount of unrecognized tax benefits for the periods presented (in thousands):

		Year Ended December 31,
		2016				2015				2014
Unrecognized benefit — beginning of period		$	2,485			$	1,975			$	1,455
Gross increases — current year tax positions		324				522				532
Gross decreases — prior year tax positions		(4		)		(12		)		(12		)
Unrecognized benefit — end of period		$	2,805			$	2,485			$	1,975

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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