Other Current Assets and Accrued Expenses (Details 1) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Other Assets [Abstract]
Carrier service costs	$ 6,798,020	$ 7,339,150
Salaries and payroll taxes	1,229,736	1,259,331
Inventory purchases, consultants and other costs	1,012,029	762,770
Severance costs	1,634	328,109
U.S. income tax payable	11,350	8,850
Foreign income tax payable (receivable)	11,600	(1,860)
Contingent consideration (Note 3)	0	100,000
Total accrued expenses	$ 9,064,369	$ 9,796,350