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Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets:    
Net operating losses $ 38,087,782 $ 72,726,440
Deferred research and development costs 205,527 669,602
Amortization of intangible assets 282,213 665,531
Share-based compensation 1,001,662 1,687,243
Fixed assets 417,085 667,008
Deferred revenue 84,130,212 102,520,433
Alternative minimum tax credits 2,652,250 2,029,190
Other 1,024,082 1,337,941
Deferred income tax assets 127,800,813 182,303,388
Deferred income tax assets, net of valuation allowance (102,556,657) (155,465,173)
Deferred income tax assets, net of valuation allowance 25,244,156 26,838,215
Deferred income tax liabilities:    
Amortization of goodwill (193,458) (287,729)
Capitalized contract costs (21,518,646) (25,854,435)
Other (1,100,089) (982,117)
Deferred income tax asset (liability), net $ 2,431,963  
Deferred income tax asset (liability), net   $ 286,066