7. INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Income Tax Disclosure [Abstract]
Domestic	$ (13,064)	$ (2,751)	$ (5,273)
Foreign	10,860	(15)	65
Loss before income tax benefit (expense)	$ (2,204)	$ (2,766)	$ (5,208)