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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Allowance for doubtful accounts $ 567,702 $ 530,744
Other assets (979,560) (1,647,113)
Accrued expenses 786,001 412,165
Other long-term liabilities 2,663,792 2,729,442
Stock-based compensation 149,087 141,960
Net operating losses 94,878 3,726,364
Subtotal 3,281,900 5,893,562
Valuation allowance (311,214) (3,760,454)
Total 2,970,686 2,133,108
Deferred tax liabilities:    
Prepaid expenses (91,665) (99,187)
Property and equipment (1,827,323) (2,858,163)
Intangibles (122,182,694) (122,088,303)
Total (124,101,682) (125,045,653)
Net deferred tax liabilities $ (121,130,996) $ (122,912,545)