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Net loss per share (Tables) | 9 Months Ended
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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 + Details
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