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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 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 years ended December 31, 2013, 2012 and 2011 (in thousands, except per share amounts):

		Year Ended December 31,
		2013				2012				2011
Numerator:
Net loss		$	(43,337	)		$	(15,917	)		$	(16,982	)
Effect of revaluation of warrant liability			—				(2,059	)			—
Adjusted net loss used for dilution calculation		$	(43,337	)		$	(17,976	)		$	(16,982	)
Denominator:
Basic weighted average number of common shares outstanding			67,569				54,515				48,050
Effect of dilutive potential common shares resulting from warrants accounted for as liabilities			—				546				—
Diluted weighted average number of common shares outstanding			67,569				55,061				48,050
Basic		$	(0.64	)		$	(0.29	)		$	(0.35	)
Diluted		$	(0.64	)		$	(0.33	)		$	(0.35	)

Anti-Dilutive Effect of Common Shares

The table below presents common shares underlying stock options, employee stock purchase plan rights, warrants, restricted stock units and/or convertible preferred stock that were 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 were excluded from the calculation due to their anti-dilutive effect for the years ended December 31, 2013, 2012 and 2011 (shares in thousands):

		Year Ended December 31,
		2013				2012				2011
Anti-dilutive common shares			16,370				8,716				13,595

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

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