Summary of Selected Quarterly Financial Data (unaudited) (Details) - Schedule of unaudited quarterly financial data - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Schedule of unaudited quarterly financial data [Abstract]
Total revenues	$ 19,527	$ 16,903	$ 19,384	$ 20,207	$ 20,921	$ 19,662	$ 19,327	$ 21,260
Gross profit	7,850	4,425	5,809	5,686	6,346	5,302	4,579	7,021
Income (loss) before income taxes	(3,325)	(9,860)	(7,687)	(7,648)	(5,390)	22,265	(8,408)	(5,978)	$ (28,520)	$ 2,489	$ (11,418)
Net income (loss)	$ (3,325)	$ (9,860)	$ (7,687)	$ (7,648)	$ (5,390)	$ 22,265	$ (8,408)	$ (5,978)	$ (28,520)	$ 2,489	$ (10,321)
Basic and diluted loss per common share (in Dollars per share)	$ (0.07)	$ (0.21)	$ (0.16)	$ (0.16)	$ (0.11)	$ 0.47	$ (0.18)	$ (0.13)