Other Current Liabilities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Carrier service costs	$ 8,476,110	$ 7,339,150
Salaries and payroll taxes	1,308,726	1,259,331
Inventory purchases, consultants and other costs	913,038	762,770
Severance costs	1,634	328,109
U.S. income tax payable	8,550	8,850
Foreign income tax payable (receivable)	8,380	(1,860)
Contingent consideration (Note 4)	0	100,000
Total accrued expenses	$ 10,716,438	$ 9,796,350