v3.2.0.727
Stock incentive plans (Details) - Jun. 30, 2015 - 2011 Plan - shares
Total
Stock incentive plans  
Annual percentage increase alternative, increase in common stock reserved for issuance as a percentage of common stock outstanding 4.50%
Annual fixed increase alternative, increase in shares of common stock reserved for issuance (in shares) 3,000,000
Common stock shares reserved for issuance 10,324,899