Quarterly report pursuant to Section 13 or 15(d)

Stock Grants to Employees - Additional Information (Detail)

v3.20.4
Stock Grants to Employees - Additional Information (Detail) - 2012 Incentive Plan Amended And Restated
shares in Thousands
6 Months Ended
Nov. 30, 2020
$ / shares
shares
Non Qualified Stock Options [Member] | Executive Officer [Member]  
Share based compensation by share based payment arrangement options granted during the period 3,350
Share based compensation by share based payment arrangement vesting period 3 years
Time Vesting Restricted Stock Units [Member] | Executive Officer [Member]  
Share based compensation by share based payment arrangement restricted stock shares granted during the period 1,120
Time Vesting Restricted Stock Units [Member] | Chief Scientific Officer [Member]  
Share based compensation by share based payment arrangement restricted stock shares granted during the period 200
Share based compensation by share based payment arrangement vesting period 3 years
Share based compensation by share based payment arrangement equity instruments other than options grant date fair value per share | $ / shares $ 2.81
Performance Vesting Restricted Stock Units [Member] | Executive Officer [Member]  
Share based compensation by share based payment arrangement restricted stock shares granted during the period 4,350
Share based compensation by share based payment arrangement vesting period 3 years