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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (3,544)	$ (5,709)	$ (12,080)	$ (9,720)
Other comprehensive income (loss), before tax:
Foreign currency translation	12	8	3,287	88
Other comprehensive income, before tax	12	8	3,287	88
Income tax expense related to items of other comprehensive income (loss)	0	0	0	0
Other comprehensive income, net of tax	12	8	3,287	88
Total comprehensive loss, net of tax	$ (3,532)	$ (5,701)	$ (8,793)	$ (9,632)

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