Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Information About Warrants Outstanding (Details)

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Stockholders' Equity - Summary of Information About Warrants Outstanding (Details) - $ / shares
3 Months Ended
Nov. 30, 2021
Aug. 31, 2021
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 17,491,772 9,592,085
Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 17,491,772  
Weighted average Life of Outstanding Warrants in years 4 years 4 months 24 days  
Exercise price (in dollars per share) $ 2.83  
Sep 2021 Common Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 2,850,000  
Weighted average Life of Outstanding Warrants in years 4 years 9 months 18 days  
Exercise price (in dollars per share) $ 1.60  
Sep 2021 Prefunded Warrants | Private Placement    
Class of Warrant or Right [Line Items]    
Sale of warrants, price per share (in dollars per share) $ 0.0001  
Sep 2021 Prefunded Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 4,673,511  
Weighted average Life of Outstanding Warrants in years 4 years 9 months 18 days  
Exercise price (in dollars per share) $ 1.59  
Sep 2021 Underwriter Warrants    
Class of Warrant or Right [Line Items]    
Warrants and rights outstanding, requisite exercise period 6 months  
Warrants term 4 years  
Sep 2021 Underwriter Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 376,176  
Weighted average Life of Outstanding Warrants in years 4 years 9 months 18 days  
Exercise price (in dollars per share) $ 1.75  
May 2021 Common Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 4,948,453  
Weighted average Life of Outstanding Warrants in years 4 years 6 months  
Exercise price (in dollars per share) $ 2.43  
May 2021Underwriter Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 247,423  
Weighted average Life of Outstanding Warrants in years 4 years 6 months  
Exercise price (in dollars per share) $ 2.43  
October 2020 Common Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 2,300,000  
Weighted average Life of Outstanding Warrants in years 3 years 9 months 18 days  
Exercise price (in dollars per share) $ 3.30  
October 2020 Underwriter Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 200,000  
Weighted average Life of Outstanding Warrants in years 3 years 9 months 18 days  
Exercise price (in dollars per share) $ 3.30  
November 2020 Common Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 1,277,580  
Weighted average Life of Outstanding Warrants in years 3 years 6 months  
Exercise price (in dollars per share) $ 5.40  
November 2020 Underwriter Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 111,108  
Weighted average Life of Outstanding Warrants in years 3 years 6 months  
Exercise price (in dollars per share) $ 5.40  
March 2020 Exchange Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 423,669  
Weighted average Life of Outstanding Warrants in years 3 years 9 months 18 days  
Exercise price (in dollars per share) $ 10.17  
Amended March 2019 Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 66,288  
Weighted average Life of Outstanding Warrants in years 2 years 3 months 18 days  
Exercise price (in dollars per share) $ 40.00  
March 2019 Services Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 3,366  
Weighted average Life of Outstanding Warrants in years 2 years 3 months 18 days  
Exercise price (in dollars per share) $ 70.00  
June 2018 Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 6,276  
Weighted average Life of Outstanding Warrants in years 2 years 1 month 6 days  
Exercise price (in dollars per share) $ 40.00  
June 2018 Services Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 5,422  
Weighted average Life of Outstanding Warrants in years 2 years 1 month 6 days  
Exercise price (in dollars per share) $ 99.60  
2017 PIPE Warrants | Warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 2,500  
Weighted average Life of Outstanding Warrants in years 1 year  
Exercise price (in dollars per share) $ 276.00  
Pre-Funded Warrant | Private Placement    
Class of Warrant or Right [Line Items]    
Warrants Outstanding (in shares) 4,673,511  
Exercise price (in dollars per share) $ 0.0001