Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Schedule of Assumptions Used to Calculate Fair Value of Stock Based Compensation (Details)

v3.10.0.1
Stock-Based Compensation - Schedule of Assumptions Used to Calculate Fair Value of Stock Based Compensation (Details)
12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Risk-free interest rate, minimum 1.66% 0.82%
Risk-free interest rate, maximum 2.90% 2.52%
Volatility, minimum 73.24% 71.90%
Volatility, maximum 91.99% 124.50%
Dividend yield 0.00% 0.00%
Minimum [Member]    
Expected term (years) 5 years 2 years 29 days
Maximum [Member]    
Expected term (years) 6 years 6 months 10 years