Quarterly report pursuant to Section 13 or 15(d)

Notes Payable and Revolving Credit Facility (Schedule of net of unamortized discount balances) (Details)

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Notes Payable and Revolving Credit Facility (Schedule of net of unamortized discount balances) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Notes payable, gross $ 39,475 $ 39,475
Less: Unamortized debt discount (865) (930)
Notes payable, net $ 38,610 $ 38,545