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Convertible Notes Payable - Additional Information (Details) - USD ($)
1 Months Ended 2 Months Ended
Oct. 31, 2020
Aug. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Feb. 29, 2020
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2020
Short Term Debt [Line Items]                
Estimated value of put option liability           $ 3,261,000   $ 6,650,000
March 2020 Notes                
Short Term Debt [Line Items]                
Convertible notes payable       $ 10,000,000        
Convertible notes, maturity date       Aug. 31, 2020        
Extended debt instrument date   Jun. 30, 2021            
Interest rate       3.00%        
Percentage of conversion price per share of preferred stock       80.00%        
Estimated value of put option liability       $ 2,500,000        
Unamortized debt discount               0
March 2020 Notes | Subsequent Event                
Short Term Debt [Line Items]                
Debt instrument converted to common stock 703,503              
Percentage of conversion price per share of common stock 80.00%              
March 2020 Notes | Subsequent Event | Common Stock                
Short Term Debt [Line Items]                
Conversion price $ 14.40              
March 2020 Notes | Series H Convertible Preferred Stock                
Short Term Debt [Line Items]                
Conversion rate       80.00%        
Conversion price       $ 1.15        
March 2020 Notes | First Tranche                
Short Term Debt [Line Items]                
Convertible notes payable       $ 5,000,000        
March 2020 Notes | Second Tranche                
Short Term Debt [Line Items]                
Convertible notes payable     $ 5,000,000          
December 2019 Notes                
Short Term Debt [Line Items]                
Convertible notes payable           $ 6,000,000    
Convertible notes, maturity date           Aug. 31, 2020    
Extended debt instrument date   Jun. 30, 2021            
Interest rate           3.00%    
Percentage of conversion price per share of preferred stock           80.00%    
Estimated value of put option liability           $ 1,500,000    
Unamortized debt discount           $ 700,000   $ 0
December 2019 Notes | Subsequent Event                
Short Term Debt [Line Items]                
Debt instrument converted to common stock 426,386              
Percentage of conversion price per share of common stock 80.00%              
December 2019 Notes | Subsequent Event | Common Stock                
Short Term Debt [Line Items]                
Conversion price $ 14.40              
December 2019 Notes | Series H Convertible Preferred Stock                
Short Term Debt [Line Items]                
Conversion rate           80.00%    
Conversion price           $ 1.15    
December 2019 Notes | First Tranche                
Short Term Debt [Line Items]                
Convertible notes payable           $ 3,000,000    
December 2019 Notes | Second Tranche                
Short Term Debt [Line Items]                
Convertible notes payable         $ 3,000,000      
August 2019 Notes                
Short Term Debt [Line Items]                
Convertible notes payable             $ 10,000,000  
Convertible notes, maturity date             Aug. 31, 2020  
Extended debt instrument date   Jun. 30, 2021            
Interest rate             3.00%  
Percentage of conversion price per share of preferred stock           80.00% 95.00%  
Estimated value of put option liability           $ 2,500,000 $ 500,000  
Unamortized debt discount           300,000 $ 0  
Increase to put option liability           $ 2,000,000    
August 2019 Notes | Subsequent Event                
Short Term Debt [Line Items]                
Debt instrument converted to common stock 718,391              
Percentage of conversion price per share of common stock 80.00%              
August 2019 Notes | Subsequent Event | Common Stock                
Short Term Debt [Line Items]                
Conversion price $ 14.40              
August 2019 Notes | Series H Convertible Preferred Stock                
Short Term Debt [Line Items]                
Conversion rate           80.00%    
Conversion price           $ 1.15 $ 1.15