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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2014

Computation of Basic and Diluted Net Loss per Share

The following table sets forth the reconciliation of the numerator and denominator used in the computation of basic and diluted net loss per share for the three and six months ended June 30, 2014 and 2013 (in thousands, except per share amounts):

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2014				2013				2014				2013
Numerator for Basic and Diluted:
Net loss used for basic calculation		$	(7,589	)		$	(6,724	)		$	(7,814	)		$	(16,976	)
Effect of revaluation of warrant liability			(4,007	)			(686	)			(13,041	)			0
Adjusted net loss used for diluted calculation		$	(11,596	)		$	(7,410	)		$	(20,855	)		$	(16,976	)
Denominator:
Basic weighted average number of shares outstanding			72,899				69,727				72,495				64,756
Effect of dilutive potential shares			1,618				2,201				2,432				0
Diluted weighted average number of shares outstanding			74,517				71,928				74,927				64,756
Net loss per share:
Basic		$	(0.10	)		$	(0.10	)		$	(0.11	)		$	(0.26	)
Diluted		$	(0.16	)		$	(0.10	)		$	(0.28	)		$	(0.26	)

Anti-Dilutive Effect of Common Shares

The table below presents shares underlying stock options, employee stock purchase plan rights and restricted stock units that are excluded from the calculation of the weighted average number of shares outstanding used for the calculation of diluted net loss per share. Warrants are excluded from the table below in periods for which the warrants are included in the calculation of diluted net loss per share. These are excluded from the calculation due to their anti-dilutive effect for the three and six months ended June 30, 2014 and 2013 (shares in thousands):

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2014				2013				2014				2013
Weighted average number of anti-dilutive potential shares			12,160				10,633				11,587				16,123

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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