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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net loss $ (1,275) $ (469)
Other comprehensive loss, before tax:    
Unrealized gain on marketable securities 0 33
Foreign currency translation (151) (125)
Other comprehensive loss, before tax (151) (92)
Income tax expense related to items of other comprehensive income 0 0
Other comprehensive loss, net of tax (151) (92)
Total comprehensive loss, net of tax $ (1,426) $ (561)