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Earnings Per Share (Details 1)
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6 Months Ended | |||||
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Jun. 30, 2012
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Jun. 30, 2011
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||||
| Number of dilutive potential common shares | 11,701,927 | 8,597,680 | ||||
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Stock options outstanding
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||||
| Number of dilutive potential common shares | 2,005,657 | 1,059,953 | ||||
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Unvested restricted stock
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||||
| Number of dilutive potential common shares | 275,262 | 409,164 | ||||
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Common stock warrants
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||||
| Number of dilutive potential common shares | 9,421,008 | [1] | 7,128,563 | [1] | ||
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