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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Taxes        
Effective tax rate 0.00% 0.00% 0.00% 0.00%
Income tax benefit $ 0 $ 0 $ 0 $ 0