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
6 Months Ended
Feb. 28, 2022
Jan. 26, 2022
Sep. 30, 2021
Aug. 31, 2021
Class of Warrant or Right [Line Items]        
Warrants Outstanding (in shares) 27,113,736     9,592,085
Warrants        
Class of Warrant or Right [Line Items]        
Warrants Outstanding (in shares) 27,113,736      
Weighted average Life of Outstanding Warrants in years 4 years 8 months 12 days      
Exercise price (in dollars per share) $ 2.22      
Jan 2022 Common Warrants        
Class of Warrant or Right [Line Items]        
Exercise price (in dollars per share)   $ 1.55    
Jan 2022 Common Warrants | Warrants        
Class of Warrant or Right [Line Items]        
Warrants Outstanding (in shares) 9,896,906      
Weighted average Life of Outstanding Warrants in years 5 years 4 months 24 days      
Exercise price (in dollars per share) $ 1.55      
Sep 2021 Common Warrants | Warrants        
Class of Warrant or Right [Line Items]        
Warrants Outstanding (in shares) 7,523,511      
Weighted average Life of Outstanding Warrants in years 4 years 6 months      
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 6 months      
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 6 months      
Exercise price (in dollars per share) $ 1.75      
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 2 months 12 days      
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 7 months 6 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 7 months 6 days      
Exercise price (in dollars per share) $ 3.30      
February 2021 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 2 months 12 days      
Exercise price (in dollars per share) $ 5.40      
February 2021 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 2 months 12 days      
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 7 months 6 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      
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      
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 1 year 9 months 18 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 1 year 9 months 18 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 3 months 18 days      
Exercise price (in dollars per share) $ 276.00