Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
August 2020 [Member] | Registered Direct Offering [Member]
Payments of issuance cost	$ 1,464,276
January 2021 [Member] | Public Offering [Member]
Payments of issuance cost	$ 2,970,165
February 2020 [Member] | Private Placement [Member]
Payments of issuance cost		$ 1,954,678