Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Stock-Based Compensation - Schedule of Assumptions Used to Calculate Fair Value of Stock Based Compensation (Details) - USD ($)
3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Expected volatility, minimum 74.87% 91.73%
Expected volatility, maximum 91.80% 97.10%
Risk-free interest rate, minimum 1.66% 0.82%
Risk-free interest rate, maximum 1.99% 1.54%
Expected forfeiture rate 0.00% 0.00%
Expected dividend yield
Minimum [Member]    
Expected term 5 years 9 years
Maximum [Member]    
Expected term 6 years 6 months 6 years 6 months