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Stock Incentive Plans - Compensation Expenses (Details) - shares
1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2015
Apr. 30, 2015
2015 Plan | Maximum      
Stock based compensation      
Shares available for grant (in shares)   1,068,287  
Common stock | 2015 Plan      
Stock based compensation      
Shares available for grant (in shares) 182,352 1,297,334  
Percentage of outstanding Common Stock available for issuance (as a percent)   4.00%  
Common stock | 2015 Plan | Annual minimum increase      
Stock based compensation      
Percentage of outstanding Common Stock available for issuance (as a percent) 1.00%    
Potential increase in shares available for issuance as determined by the Board of Directors (in shares) 364,705    
Common stock | 2008 Plan      
Stock based compensation      
Shares available for grant (in shares)     25,942