Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Income taxes (Details)

v3.22.2.2
Summary of Significant Accounting Policies - Income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Accounting Policies [Abstract]      
Income tax expense $ 0 $ 0 $ 0
Effective income tax rate 0.00% 0.00% 0.00%
Federal statutory income tax rate, percent 21.00% 21.00% 21.00%