Income Taxes (Details 1) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets:
Allowance for receivables	$ 76,266	$ 100,414
Deferred revenue	1,970,216	3,648,029
Share-based compensation	517,841	2,254,428
Accrued expenses and other liabilities	404,316	418,483
Domestic net operating loss carryforwards	19,572,148	30,714,934
Foreign net operating loss carryforwards	17,997	9,761
Tax credit carryforwards	3,106,022	574,997
AMT tax credit carryforwards	464,571	460,607
Capital loss carryforwards	57,768	78,296
Fixed assets	218,412	489,105
Intangibles	625,126	1,435,994
Sub-total	27,030,683	40,185,048
Valuation allowance	(25,602,357)	(38,800,877)
Total Deferred Tax Assets	1,428,326	1,384,171
Deferred Tax Liabilities:
Deferred state income tax	(450,797)	(923,553)
Foreign withholding taxes	(472,112)	(137,659)
Total Deferred Tax Liabilities	(922,909)	(1,061,212)
Net Deferred Tax Assets	$ 505,417	$ 322,959