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Share-Based Compensation - Summary of Share Options Activity under 2006 Share Incentive Plan (Detail) - 2006 Share Incentive Plan [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
May 31, 2019
$ / shares
shares
May 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of share options outstanding, Beginning balance | shares 5,852  
Number of share options, Exercised | shares  
Number of share options, Canceled | shares (5,852)  
Number of share options outstanding, Ending balance | shares 5,852
Weighted average exercise prices, Options outstanding, Beginning balance $ 2.02  
Weighted average exercise prices, Exercised  
Weighted average exercise prices, Canceled 2.02  
Weighted average exercise prices, Options outstanding, Ending balance $ 2.02
Weighted average exercise prices, Options exercisable at May 31, 2019  
Remaining contractual life, Options outstanding   6 months 25 days
Aggregate intrinsic value, Options outstanding | $   $ 475