Accounts Payable and Accrued Expenses (Schedule of Accounts Payable and Accrued Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts Payable and Accrued Expenses [Abstract]
Accounts payable	$ 4,207	$ 1,627
Accrued Expenses
Guaranteed payments in connection with acquisitions - current	2,828	3,295
Interest	2,401	3,215
Compensation	3,365	4,928
Marketing and Commissions	1,330	2,804
Professional services fees	1,986	424
Legal settlement payable - current	3,200
Licensee settlement payable - current	1,883
Other accrued expenses	2,327	2,833
Total accounts payable and accrued expenses	$ 23,527	$ 19,126