Income taxes (Details) - Schedule of benefit for income taxes - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Income taxes (Details) - Schedule of benefit for income taxes [Line Items]
Income (loss) before taxes	$ (28,520)	$ 2,489	$ (11,418)
United States operations [Member]
Income taxes (Details) - Schedule of benefit for income taxes [Line Items]
Income (loss) before taxes	(27,690)	4,618	(9,540)
International operations [Member]
Income taxes (Details) - Schedule of benefit for income taxes [Line Items]
Income (loss) before taxes	$ (830)	$ (2,129)	$ (1,878)