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Income Taxes - Additional Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Tax [Line Items]      
Percentage Of Valuation Allowance 100.00%    
Income Tax Expense (Benefit) $ 0 $ 0  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 0.00%   0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 34.00%