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Other Current Assets and Accrued Expenses (Details 1) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Carrier service costs $ 7,305,010 $ 7,339,150
Salaries and payroll taxes 1,246,767 1,259,331
Inventory purchases, consultants and other costs 743,464 762,770
Severance costs 10,673 328,109
Contingent consideration (Note 3) 0 100,000
Total accrued expenses 9,315,474 9,796,350
UNITED STATES    
Accrued Income Taxes, Current 11,350 8,850
Foreign [Member]    
Accrued Income Taxes, Current $ (1,790) $ (1,860)