Other Current Liabilities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Carrier service costs	$ 7,339,150	$ 5,514,978
Salaries and payroll taxes	1,259,331	1,374,835
Inventory purchases, consultants and other costs	762,770	986,013
Severance costs	328,109	0
Contingent consideration (Note 4)	100,000	0
Accrued expenses	9,796,350	7,834,802
UNITED STATES
Accrued Income Taxes, Current	8,850	(42,896)
Foreign [Member]
Accrued Income Taxes, Current	$ (1,860)	$ 1,872