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Stock Incentive Plans - Employee Stock Purchase Plan (Details) - Common Stock - Employee Stock Purchase Plan - shares
1 Months Ended 6 Months Ended
Jan. 01, 2017
Jan. 01, 2016
Jun. 30, 2015
Jun. 30, 2017
Stock-Based Compensation        
Shares available for grant (in shares)     182,352  
Number of shares issued (in shares)       0
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) 188,175 153,132 364,705