Quarterly report pursuant to Section 13 or 15(d)

Summary of Fair Value of Convertible Note Redemption Provision Derivative Liability (Detail)

v3.20.4
Summary of Fair Value of Convertible Note Redemption Provision Derivative Liability (Detail) - USD ($)
$ in Thousands
6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Net Proceeds $ 50,000  
Derivative Liability   $ 1,456
Convertible Note Redemption Provision Derivative Liability [Member] | Inception date June 2018 Note, November 15, 2018 [Member]    
Net Proceeds 5,000  
Inception Date 1,285  
Derivative Liability   481
Convertible Note Redemption Provision Derivative Liability [Member] | Inception date January 2019 Note, January 30, 2019 [Member]    
Net Proceeds 5,000  
Inception Date $ 1,465  
Derivative Liability   $ 975