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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Allowance for doubtful accounts $ 319,049 $ 329,107
Other assets 15,752 780,009
Accrued expenses 212,808 134,277
Other long-term liabilities 688,462 286,149
Stock-based compensation 321,860 404,667
Net operating losses 277,235 293,184
Subtotal 1,835,166 2,227,393
Valuation allowance (594,079) (630,775)
Total 1,241,087 1,596,618
Deferred tax liabilities:    
Prepaid expenses (382,250) (243,067)
Property and equipment (2,907,439) (3,088,066)
Intangibles (75,690,599) (74,041,982)
Total (78,980,288) (77,373,115)
Net deferred tax liabilities $ (77,739,201) $ (75,776,497)