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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes [Abstract]

Schedule of company's deferred tax assets

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

		December 31,
		2012				2011
Deferred tax assets:
Net operating loss carryforwards		$	73,129			$	67,395
Research and development tax credit carryforwards			6,770				6,844
Capitalized research			5				117
Stock-based compensation			7,375				7,355
Other			937				1,125
			88,216				82,836
Valuation allowance			(88,216	)			(82,836	)
Net deferred tax assets		$	—			$	—

Summary of the activity related to the Company's unrecognized tax benefits

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

		December 31,
		2012				2011				2010
Beginning balance		$	2,750			$	1,896			$	1,643
Additions based on tax positions related to the current year			153				589				253
Additions for tax positions of prior years			58				265				—
Reductions for tax positions of prior years			(227	)			—				—
Ending balance		$	2,734			$	2,750			$	1,896

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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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 21

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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