Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Schedule of Share-Based Compensation Expense (Details)

v3.3.1.900
Share-Based Compensation - Schedule of Share-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based payment expense $ 1,371 $ 1,601 $ 2,434 $ 3,277
Employee        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based payment expense 1,078 1,425 2,049 2,949
Non-Employee        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based payment expense $ 293 $ 176 $ 385 $ 328