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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2012

Summary of Significant Accounting Policies [Abstract]

Computation of basic and diluted net loss per common share

The following table sets forth the reconciliation of the numerator and denominator used in the computation of basic and diluted net loss per common share for the three and six months ended June 30, 2012, and 2011 (in thousands, except per share amounts):

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2012				2011				2012				2011
Numerator:
Net loss used for basic calculation		$	(1,907	)		$	(6,409	)		$	(10,741	)		$	(11,507	)
Effect of revaluation of warrant liability			(3,674	)			0				0				0
Adjusted net loss used for diluted calculation		$	(5,581	)		$	(6,409	)		$	(10,741	)		$	(11,507	)
Denominator:
Basic weighted average number of common shares outstanding			54,418				47,620				53,753				47,530
Effect of dilutive potential common shares resulting from warrants			818				0				0				0
Diluted weighted average number of common shares outstanding			55,236				47,620				53,753				47,530
Net loss per common share:
Basic		$	(0.04	)		$	(0.13	)		$	(0.20	)		$	(0.24	)
Diluted		$	(0.10	)		$	(0.13	)		$	(0.20	)		$	(0.24	)

Anti-dilutive effect of common shares

The table below presents common shares underlying stock options, convertible preferred stock, employee stock purchase plan rights, warrants and restricted stock units that are excluded from the calculation of the weighted average number of common shares outstanding used for the calculation of diluted net loss per common share. These are excluded from the calculation due to their anti-dilutive effect for the three and six months ended June 30, 2012, and 2011 (shares in thousands):

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2012				2011				2012				2011
Weighted average of anti-dilutive common shares			9,165				13,635				14,828				13,592

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 40

-Subparagraph c

-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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- Definition

Tabular disclosure of the reconciliation of basic net earnings per share (or unit) to diluted earnings per share (or unit).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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