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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of Company's Deferred Tax Assets

Significant components of the Company’s deferred tax assets are as follows (in thousands):

		December 31,
		2013				2012
Assets:
Deferred tax assets:
Net operating loss carryforwards		$	81,944			$	73,129
Research and development tax credit carryforwards			7,996				6,770
Capitalized research			—				5
Stock-based compensation			7,927				7,375
Deferred Revenue			3,563				—
Other			1,677				937
Total deferred tax asset			103,107				88,216
Valuation allowance			(103,107	)			(88,216	)
Net deferred tax assets		$	—			$	—
Liabilities:
Net deferred tax liability related to intangible assets			(748	)			—
Total deferred tax liability		$	(748	)		$	—

Summary of Activity Related to Company's Unrecognized Tax Benefits

The following table summarizes the activity related to the Company’s unrecognized tax benefits (in thousands):

		December 31,
		2013				2012				2011
Beginning balance		$	2,735			$	2,750			$	1,896
Additions based on tax positions related to the current year			294				153				589
Additions for tax positions of prior years			153				58				265
Reductions for tax positions of prior years			—				(227	)			—
Ending balance		$	3,182			$	2,734			$	2,750

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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- Definition

Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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