Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical)

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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 06, 2018
Oct. 08, 2018
Oct. 25, 2017
Feb. 28, 2018
Apr. 30, 2019
Apr. 30, 2019
Apr. 30, 2018
Statement of Stockholders' Equity [Abstract]              
Payment of finance and offering costs $ 304,916 $ 573,189 $ 901,137 $ 2,249,169 $ 80,575 $ 80,575 $ 299,963
Dividends payable, amount per share         $ 0.00 $ 0.00 $ 0.00