Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Additional Information 3 (Details)

v3.20.2
STOCKHOLDERS' EQUITY - Additional Information 3 (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Nov. 30, 2019
Nov. 30, 2018
May 31, 2020
May 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to non-vested share     $ 12,482  
Weighted-average period, cost expected to be recognized     1 year 8 months 12 days  
Weighted average remaining contractual term 9 years   8 years 4 months 24 days  
Value of common shares issued on exercise of option   $ 42    
Stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense     $ 7,348 $ 5,740
Weighted-average grant-date fair value of options granted     $ 1.39 $ 2.59
2016 Stock Incentive Plan (the Plan)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued     18,000  
Weighted average remaining contractual term     10 years  
2016 Stock Incentive Plan (the Plan) | Stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years