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Notes Payable (Schedule of Payments due under Notes Payable) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Notes Payable [Abstract]  
Remainder of 2018 $ 353
2019 1,400
2020 16,491
Total remaining payments 18,244
Less: interest and discounts (3,860)
Notes payable $ 14,384