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Share-Based Compensation (Details) - shares
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Equity-based compensation    
Options issued (in shares) 3,236,814 2,086,450
The Plan    
Equity-based compensation    
Number of shares allowed for issuance 5,600,000  
The Plan | Options    
Equity-based compensation    
Vesting percentage per year 25.00%  
Vesting period 4 years  
Options available for grant (in shares) 2,323,939  
The Plan | Options | Maximum    
Equity-based compensation    
Terms of options 10 years  
Equity incentive outside of the Plan | Options    
Equity-based compensation    
Options issued (in shares) 206,000