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Fair Value of Financial Instruments (Changes in Financial Instruments Measured Using Level 3 Inputs) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Changes in financial instruments measured at fair value using Level 3 inputs          
Beginning balance $ 341 $ 227 $ 92 $ 89
Loss on re-measurement of the financing derivative liability   114 135 3
Financing derivative - loan payoff   (341)      
Ending balance $ 341 $ 227 $ 92