Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Accounting Policies [Abstract]
Contract with Customer, Asset, after Allowance for Credit Loss	$ 0	$ 0	$ 0	$ 0
Contract with Customer, Liability	0		0
Revenue from Contract with Customer, Excluding Assessed Tax			266	0
Contract with Customer, Liability, Revenue Recognized	$ 0	$ 0	$ 0	$ 0