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Income Taxes (Details 2) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 406,387 | $ 335,624
Other assets | 817,880 | 547,327
Accrued expenses | 519,447 | 485,506
Other Long - term Liabilities | 381,380 | 426,203
Stock-based compensation | 347,493 | 425,699
Net operating losses | 382,852 | 638,858
Subtotal | 2,855,439 | 2,859,217
Valuation allowance | (643,552) | (653,919)
Total | 2,211,887 | 2,205,298
Deferred tax liabilities: |  |
Prepaid expenses | (506,933) | (674,314)
Property and equipment | (1,427,035) | (1,561,300)
Intangibles | (49,308,526) | (45,126,386)
Total | (51,242,494) | (47,362,000)
Net deferred tax liabilities | $ (49,030,607) | $ (45,156,702)

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