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Debt (Summary of Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Current portion of Senior Secured Debenture $ 76 $ 8,377
Non-current portion of Senior Secured Debenture 0 2,611
Total debt 76 10,988
Secured Debt | Securities Purchase Agreement    
Debt Instrument [Line Items]    
Current portion of Senior Secured Debenture 0 8,377
Non-current portion of Senior Secured Debenture 0 2,611
Convertible Notes Payable    
Debt Instrument [Line Items]    
Short-term convertible promissory notes $ 76 $ 0