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Income Taxes (Details 2) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Summary of Deferred tax assets and liabilities |  |
Stock-based compensation | $ 3,289,885 | $ 2,629,271
Unrealized (gains) losses | (763,235) | (441,092)
Other assets and liabilities | (74,676) | (104,777)
Net deferred tax assets | $ 2,451,974 | $ 2,083,402

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