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Summary of Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accounting Policies [Abstract]        
Income tax expense (benefit) $ 0 $ 0 $ 0 $ 0