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Stock Incentive Plans Stock Incentive Plans- ESPP (Details) - ESPP
1 Months Ended
May 31, 2015
USD ($)
Stock incentive plans  
Maximum offering period 12 months
Purchase period 6 months
Maximum fair market value of shares an employee can purchase per calendar year $ 25,000
Minimum  
Stock incentive plans  
Minimum purchase price as a percentage of fair market value 85.00%