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Net loss per common share (Tables) | 12 Months Ended
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Dec. 31, 2014
Potential Dilutive Securities Outstanding | Potentially dilutive securities outstanding are summarized as follows:
|  | December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Exercise of common stock options |  |  | 21,541,664 |  |  |  | 24,237,940 |  |  |  | 18,674,539 |
Conversion of senior convertible notes into common stock |  |  | 17,323,080 |  |  |  | 25,415,366 |  |  |  | 19,826,113 |
Exercise of common stock warrants |  |  | 9,987,876 |  |  |  | 19,706,240 |  |  |  | 86,062,440 |
Vesting of restricted stock units |  |  | 2,610,720 |  |  |  | 9,115,821 |  |  |  | 3,761,031 |
|  |  | 51,463,340 |  |  |  | 78,475,367 |  |  |  | 128,324,123 |

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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration