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ACCOUNTS PAYABLE AND ACCRUED EXPENSES - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounts Payable [Abstract]    
Accounts payable $ 6,171 $ 8,030
Accrued compensation 3,857 6,193
Accrued network fees $ 7,674 $ 6,971