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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2013
Summary of Significant Accounting Policies [Abstract] |
Basic and dilutive net loss per share computations | The following is a reconciliation of the numerators and denominators of the basic and diluted net income or loss per share computations:
|  | Three months ended March 31, |
|  | 2013 |  |  | 2012 |
Net loss |  | $ | (6,416,447 | ) |  | $ | (10,229,439 | )
Weighted average shares outstanding used to compute basic and diluted net income or loss per share |  |  | 38,263,434 |  |  |  | 22,958,498 |
Basic and diluted net loss per share |  | $ | (0.17 | ) |  | $ | (0.45 | )
Outstanding options, warrants and restricted stock units | The following outstanding potentially dilutive common stock equivalents were excluded from the computation of diluted net income or loss per share because the effect would have been anti-dilutive as of March 31:
|  | 2013 |  |  | 2012 |
Options |  |  | 443,926 |  |  |  | 872,032 |
Restricted stock units |  |  | 1,236,982 |  |  |  | 1,542,676 |
Warrants |  |  | 9,601,378 |  |  |  | 17,434,483 |
Total |  |  | 11,282,286 |  |  |  | 19,849,191 |

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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Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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