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Net loss per share (Tables) | 3 Months Ended
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Mar. 31, 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 March 31,
Common Stock Equivalents | 2013 |  | 2012
Options to purchase common stock | 18,493,523 |  |  | 16,495,527 |
Warrants to purchase common stock | 35,227,529 |  |  | 21,743,844 |
Convertible preferred stock | 38,233 |  |  | 38,233 |
Total | 53,759,285 |  |  | 38,277,604 |

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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