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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of ESPP Share Activity

The following is a summary of 2009 ESPP share activity for the period ended March 31, 2016:

 

     Shares  

Available for future purchases, January 1, 2016

     279,589   

Additional shares reserved under 2009 ESPP

     82,084   

Purchases

     (33,923
  

 

 

 

Available for future purchases, March 31, 2016

     327,750