v2.4.0.8

Income Taxes Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Components of Income (Loss) before Provision (Benefit) for Income Tax, Domestic and Foreign

	Years Ended December 31,
	2013				2012				2011
Domestic	$	(12,770	)		$	(11,918	)		$	(13,775	)
Foreign	439				(993		)		(1,256		)
Loss before income taxes	$	(12,331	)		$	(12,911	)		$	(15,031	)

Components of Income Tax Expense (Benefit)

	Years Ended December 31,
	2013				2012				2011
Current:
Federal	$	—			$	—			$	236
State	—				—				20
Foreign	574				351				69
Total current	574				351				325
Deferred:
Federal	(5,217		)		(4,162		)		(5,183		)
State	(1,174		)		(2,062		)		(1,731		)
Foreign	(166		)		—				685
Change in valuation allowance	6,385				6,214				12,897
Total deferred	(172		)		(10		)		6,668
Total income tax provision	$	402			$	341			$	6,993

Effective Income Tax Rate Reconciliation

	Years Ended December 31,
	2013				2012				2011
Benefit at statutory rate	$	(4,191	)		$	(4,390	)		$	(5,111	)
State income taxes (net of federal benefit)	1				(1,247		)		24
Research and development credits	(3,630		)		(858		)		(3,320		)
Foreign rate differential	(80		)		445				1,182
Stock compensation	460				278				974
Foreign deemed dividend	835				—				94
Estimated export compliance fines and penalties	—				(255		)		255
Foreign tax credit	—				—				(236		)
Uncertain tax positions	266				199				236
Permanent and other	356				(45		)		24
Valuation allowance	6,385				6,214				12,871
Total provision for income taxes	$	402			$	341			$	6,993

Components of Deferred Tax Assets

	December 31,
	2013				2012
Deferred tax assets:
Net operating loss carryforwards	$	8,545			$	8,216
Research and development credits	12,718				9,088
Accrued expenses and other	476				403
Accrued compensation	1,686				1,567
Stock-based compensation	2,732				3,184
Depreciation and amortization	2,637				—
	28,794				22,458
Less valuation allowance	(28,628		)		(22,243		)
	166				215
Deferred tax liability:
Depreciation and amortization	—				(215		)
Net deferred tax assets	$	166			$	—

Summary of Changes to Unrecognized Tax Benefits

Balance as of December 31, 2010	$	1,184
Additions based on tax positions related to the current year	1,018
Additions based on tax positions of prior year	818
Balance as of December 31, 2011	3,020
Additions based on tax positions related to the current year	725
Additions based on tax positions of prior years	132
Decreases based on tax positions of prior year	(127		)
Balance as of December 31, 2012	3,750
Additions based on tax positions related to the current year	1,689
Additions based on tax positions of prior years	23
Balance as of December 31, 2013	$	5,462

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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.

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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 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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