Annual report pursuant to Section 13 and 15(d)

Summary of significant accounting policies - Estimate fair value (Details)

v3.20.2
Summary of significant accounting policies - Estimate fair value (Details)
12 Months Ended
Aug. 31, 2020
$ / shares
Volatility 134.00%
March 2019 Conversion Feature [Member]  
Market price per share $ 6.68
Dividend yield 0.00%
March 2019 Conversion Feature [Member] | Minimum  
Risk free rate 0.08%
Life of instrument in years 5 months 19 days
Volatility 117.00%
March 2019 Conversion Feature [Member] | Maximum  
Risk free rate 0.17%
Life of instrument in years 1 year 1 month 24 days
Volatility 139.00%
March 2019 Warrant Liability [Member]  
Risk free rate 1.60%
Market price per share $ 6.68
Life of instrument in years 4 years
Volatility 102.00%
Dividend yield 0.00%