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Net loss per share (Tables)

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes potential common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect:

	As of September 30,
Common Stock Equivalents	2013			2012
Options to purchase common stock	16,982,197			16,538,985
Warrants to purchase common stock	14,639,260			21,593,844
Convertible preferred stock	38,233			38,233
Total	31,659,690			38,171,062

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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

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