Quarterly report pursuant to Section 13 or 15(d)

Stockholders??? Equity - Schedule of Changes in Stockholders' Equity (Details)

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Stockholders’ Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($)
3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Equity [Abstract]    
Stockholders’ equity at beginning of period $ 10,695,982 $ 28,053,104
Net loss (5,900,452) (5,603,585)
Stock-based compensation 554,575 1,148,208
Common stock issued for services 109,000
Issuance of common stock through employee stock purchase plan 19,048 25,617
Equity offerings (see Note 6), net of costs 8,058,733
Accumulated other comprehensive income (loss) (6,744) (9)
Exercise of common stock warrants (net) 9,000 13,306
Stockholders’ equity at end of period $ 13,539,142 $ 23,638,641