Annual report pursuant to Section 13 and 15(d)

Warrants and Derivative Liabilities - Schedule of Input and Valuation Techniques Used to Value Warrant Liabilities (Details)

v3.22.1
Warrants and Derivative Liabilities - Schedule of Input and Valuation Techniques Used to Value Warrant Liabilities (Details)
Dec. 31, 2021
$ / shares
Sep. 30, 2021
$ / shares
Jul. 31, 2021
$ / shares
Dec. 31, 2020
$ / shares
Aug. 04, 2020
$ / shares
2021 Inducement Warrants | Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input     0    
2021 Inducement Warrants | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input     1.3787    
2021 Inducement Warrants | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input     0.0073    
2021 Inducement Warrants | Expected term (years)          
Class of Warrant or Right [Line Items]          
Expected term (years)     5 years    
2021 Inducement Warrants | Underlying common stock price          
Class of Warrant or Right [Line Items]          
Underlying common stock price (in dollars per share)     $ 0.15    
2021 Inducement Warrants to Placement Agent | Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input     0    
2021 Inducement Warrants to Placement Agent | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input     1.3787    
2021 Inducement Warrants to Placement Agent | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input     0.0073    
2021 Inducement Warrants to Placement Agent | Expected term (years)          
Class of Warrant or Right [Line Items]          
Expected term (years)     5 years    
2021 Inducement Warrants to Placement Agent | Underlying common stock price          
Class of Warrant or Right [Line Items]          
Underlying common stock price (in dollars per share)     $ 0.15    
2021 Common Stock Warrants | Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0      
2021 Common Stock Warrants | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   1.3602      
2021 Common Stock Warrants | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0.0101      
2021 Common Stock Warrants | Expected term (years)          
Class of Warrant or Right [Line Items]          
Expected term (years)   5 years      
2021 Common Stock Warrants | Underlying common stock price          
Class of Warrant or Right [Line Items]          
Underlying common stock price (in dollars per share)   $ 0.09      
2021 Pre-Funded Warrants | Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0      
2021 Pre-Funded Warrants | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   1.3506      
2021 Pre-Funded Warrants | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0.0155      
2021 Pre-Funded Warrants | Expected term (years)          
Class of Warrant or Right [Line Items]          
Expected term (years)   10 years      
2021 Pre-Funded Warrants | Underlying common stock price          
Class of Warrant or Right [Line Items]          
Underlying common stock price (in dollars per share)   $ 0.09      
2021 Common Stock Warrants to Placement Agent | Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0      
2021 Common Stock Warrants to Placement Agent | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   1.3602      
2021 Common Stock Warrants to Placement Agent | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0.0101      
2021 Common Stock Warrants to Placement Agent | Expected term (years)          
Class of Warrant or Right [Line Items]          
Expected term (years)   5 years      
2021 Common Stock Warrants to Placement Agent | Underlying common stock price          
Class of Warrant or Right [Line Items]          
Underlying common stock price (in dollars per share)   $ 0.09      
Common Stock Warrants | Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input         0
Common Stock Warrants | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input         0.9164
Common Stock Warrants | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input         0.0019
Common Stock Warrants | Expected term (years)          
Class of Warrant or Right [Line Items]          
Expected term (years)         5 years
Common Stock Warrants | Underlying common stock price          
Class of Warrant or Right [Line Items]          
Underlying common stock price (in dollars per share)         $ 0.05
Pre-funded Warrants | Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input         0
Pre-funded Warrants | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input         0.9386
Pre-funded Warrants | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input         0.0052
Pre-funded Warrants | Expected term (years)          
Class of Warrant or Right [Line Items]          
Expected term (years)         10 years
Pre-funded Warrants | Underlying common stock price          
Class of Warrant or Right [Line Items]          
Underlying common stock price (in dollars per share)         $ 0.05
2020 Common Stock Warrants to Placement Agent | Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input         0
2020 Common Stock Warrants to Placement Agent | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input         0.9164
2020 Common Stock Warrants to Placement Agent | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input         0.0019
2020 Common Stock Warrants to Placement Agent | Expected term (years)          
Class of Warrant or Right [Line Items]          
Expected term (years)         4 years 11 months 26 days
2020 Common Stock Warrants to Placement Agent | Underlying common stock price          
Class of Warrant or Right [Line Items]          
Underlying common stock price (in dollars per share)         $ 0.05
Emerald Financing | Dividend yield          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0     0  
Emerald Financing | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 1.2650     0.9090  
Emerald Financing | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.0043     0.0014  
Emerald Financing | Expected term (years)          
Class of Warrant or Right [Line Items]          
Expected term (years) 1 year 1 month 17 days     2 years 1 month 17 days  
Emerald Financing | Underlying common stock price          
Class of Warrant or Right [Line Items]          
Underlying common stock price (in dollars per share) $ 0.05     $ 0.04