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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

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