Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Going concern (Detail)

v3.22.1
Summary of Significant Accounting Policies - Going concern (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2022
Nov. 30, 2021
Aug. 31, 2021
Feb. 28, 2021
Nov. 30, 2020
Aug. 31, 2020
Feb. 28, 2022
Feb. 28, 2021
May 31, 2021
Accounting Policies [Abstract]                  
Net loss $ 32,328 $ 36,604 $ 31,458 $ 45,206 $ 35,425 $ 30,832 $ 100,390 $ 111,463  
Accumulated deficit $ 636,078           $ 636,078   $ 534,440