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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2013

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, 2013, and 2012 (in thousands, except per share amounts):

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2013				2012				2013				2012
Numerator:
Net loss used for basic calculation		$	(6,724	)		$	(1,907	)		$	(16,976	)		$	(10,741	)
Effect of revaluation of warrant liability			(686	)			(3,674	)			0				0
Adjusted net loss used for diluted calculation		$	(7,410	)		$	(5,581	)		$	(16,976	)		$	(10,741	)
Denominator:
Basic weighted average number of common shares outstanding			69,727				54,418				64,756				53,753
Effect of dilutive potential common shares resulting from warrants			2,201				818				0				0
Diluted weighted average number of common shares outstanding			71,928				55,236				64,756				53,753
Net loss per common share:
Basic		$	(0.10	)		$	(0.04	)		$	(0.26	)		$	(0.20	)
Diluted		$	(0.10	)		$	(0.10	)		$	(0.26	)		$	(0.20	)

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, 2013, and 2012 (shares in thousands):

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2013				2012				2013				2012
Weighted average of anti-dilutive common shares			10,633				9,165				16,123				14,828

X

- 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

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X

- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ 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

+ Details

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