Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Revenue (Details)

v3.21.4
Summary of Significant Accounting Policies - Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2021
Nov. 30, 2020
Accounting Policies [Abstract]      
Contract with Customer, Asset, after Allowance for Credit Loss $ 0 $ 0 $ 0
Contract with Customer, Liability 0 0 0
Revenue from Contract with Customer, Excluding Assessed Tax $ 225,000 266,000 0
Contract with Customer, Liability, Revenue Recognized   0 0
Contract with Customer, Performance Obligation Satisfied in Previous Period   $ 0 $ 0