| Schedule of the components of the calculations of basic and diluted earnings per share |
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Three Months Ended
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Six Months Ended
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June 30, 2012
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June 30, 2011
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June 30, 2012
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June 30, 2011
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Numerator:
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Net loss
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$
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(6,479,554)
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$
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(6,752,668)
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$
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(13,062,656)
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$
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(13,995,868)
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Denominator:
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Weighted average number of common shares outstanding
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37,853,358
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16,320,235
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30,645,479
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14,781,215
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| Schedule of potential dilutive common shares |
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At June 30,
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2012
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2011
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Stock options outstanding
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2,005,657
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1,059,953
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Unvested restricted stock
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275,262
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409,164
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Common stock warrants (1)
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9,421,008
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7,128,563
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Number of dilutive potential common shares
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11,701,927
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8,597,680
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(1)
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On May 31, 2011, the Company granted 7,128,563 warrants as part of an underwritten public offering. As a result of the March 28 and 29, 2012 public offerings described in Note 5, the number of warrants increased to 9,421,008.
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