Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of information about warrants outstanding (Details)

v3.20.4
Stockholders' Equity - Summary of information about warrants outstanding (Details) - $ / shares
 3 Months Ended
Oct. 08, 2020
Nov. 30, 2020
Exercise price (in dollars per share)   $ 3.85
October 2020 Common Warrants [Member]    
Warrants outstanding 200,000 2,300,000
Weighted average life of outstanding warrants in years   4 years 10 months 24 days
Exercise price (in dollars per share)   $ 3.30
October 2020 Underwriter Warrants [Member]    
Warrants outstanding   200,000
Weighted average life of outstanding warrants in years   4 years 10 months 24 days
Exercise price (in dollars per share)   $ 3.30
May 2020 Offering Common Warrants Member    
Warrants outstanding   1,277,580
Weighted average life of outstanding warrants in years   4 years 6 months
Exercise price (in dollars per share)   $ 5.40
May 2020 Offering Underwriter Warrants Member    
Warrants outstanding   111,108
Weighted average life of outstanding warrants in years   4 years 6 months
Exercise price (in dollars per share)   $ 5.40
March 2020 Exchange Warrants Member    
Warrants outstanding   423,669
Weighted average life of outstanding warrants in years   4 years 9 months 18 days
Exercise price (in dollars per share)   $ 10.17
Amended March 2019 Notes Warrants [Member]    
Warrants outstanding   66,288
Weighted average life of outstanding warrants in years   3 years 3 months 18 days
Exercise price (in dollars per share)   $ 40.00
March 2019 Services Warrants [Member]    
Warrants outstanding   3,366
Weighted average life of outstanding warrants in years   3 years
Exercise price (in dollars per share)   $ 70.00
June 2018 Notes Warrants [Member]    
Warrants outstanding   6,276
Weighted average life of outstanding warrants in years   3 years
Exercise price (in dollars per share)   $ 40.00
June 2018 Services Warrants [Member]    
Warrants outstanding   5,422
Weighted average life of outstanding warrants in years   3 years
Exercise price (in dollars per share)   $ 99.60
2017 PIPE Warrants [Member]    
Warrants outstanding   2,500
Weighted average life of outstanding warrants in years   1 year 7 months 6 days
Exercise price (in dollars per share)   $ 276.00
Warrant [Member]    
Warrants outstanding   4,396,209
Weighted average life of outstanding warrants in years   4 years 8 months 12 days
Exercise price (in dollars per share)   $ 5.51