Quarterly report pursuant to Section 13 or 15(d)

Warrants and Derivative Liabilities - Schedule of Warrants Vested and Outstanding (Details)

v3.21.2
Warrants and Derivative Liabilities - Schedule of Warrants Vested and Outstanding (Details)
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Jul. 31, 2021
$ / shares
Jul. 26, 2021
$ / shares
Dec. 31, 2020
$ / shares
Aug. 31, 2020
$ / shares
Class of Warrant or Right [Line Items]          
Number of Warrants Vested and Outstanding (in shares) | shares 154,583,892        
Pre 2015 Common Stock Warrants          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 1.00        
Term (Years) 10 years        
Number of Warrants Vested and Outstanding (in shares) | shares 1,110,000        
2015 Common Stock Warrants          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 5.00        
Term (Years) 10 years        
Number of Warrants Vested and Outstanding (in shares) | shares 100,000        
2016 Common Stock Warrants to Service Providers          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 1.15        
Term (Years) 10 years        
Number of Warrants Vested and Outstanding (in shares) | shares 40,000        
2016 Series C Common Stock Warrants to Placement Agent          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.40        
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 125,000        
2017 Series D Common Stock Warrants to Placement Agent          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.25        
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 480,000        
2017 Common Stock Warrants to Service Provider          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.41        
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 125,000        
2018 Emerald Financing Warrants          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.10       $ 0.10
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 3,400,000        
Underlying common stock price (in dollars per share) $ 0.11     $ 0.04  
2018 Emerald Financing Warrants | Measurement Input, Expected Dividend Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.0000     0.0000  
2018 Emerald Financing Warrants | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 1.348     0.909  
2018 Emerald Financing Warrants | Measurement Input, Risk Free Interest Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.0016     0.0014  
2018 Emerald Financing Warrants | Measurement Input, Expected Term [Member]          
Class of Warrant or Right [Line Items]          
Expected term (years) 1 year 4 months 17 days     2 years 1 month 17 days  
Emerald Multi-Draw Credit Agreement Warrants          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.50        
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 7,500,000        
2019 Common Stock Warrants          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.35        
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 8,000,000        
2020 Common Stock Warrants to Placement Agent          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.08        
Term (Years) 4 years 11 months 26 days        
Number of Warrants Vested and Outstanding (in shares) | shares 8,166,667        
2021 Inducement Warrants          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.15   $ 0.06    
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 21,166,667        
Underlying common stock price (in dollars per share)   $ 0.15      
2021 Inducement Warrants | Measurement Input, Expected Dividend Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0.0000      
2021 Inducement Warrants | Volatility factor          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   1.3787      
2021 Inducement Warrants | Measurement Input, Risk Free Interest Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0.0073      
2021 Inducement Warrants | Measurement Input, Expected Term [Member]          
Class of Warrant or Right [Line Items]          
Expected term (years)   5 years      
2021 Inducement Warrants to Placement Agent          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.19        
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 1,481,667        
Underlying common stock price (in dollars per share)   $ 0.15      
2021 Inducement Warrants to Placement Agent | Measurement Input, Expected Dividend Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0.0000      
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 | Measurement Input, Risk Free Interest Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input   0.0073      
2021 Inducement Warrants to Placement Agent | Measurement Input, Expected Term [Member]          
Class of Warrant or Right [Line Items]          
Expected term (years)   5 years      
2021 Common Stock Warrants          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.09        
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 77,777,779        
Underlying common stock price (in dollars per share) $ 0.09        
2021 Common Stock Warrants | Measurement Input, Expected Dividend Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.0000        
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 | Measurement Input, Risk Free Interest Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.0101        
2021 Common Stock Warrants | Measurement Input, Expected Term [Member]          
Class of Warrant or Right [Line Items]          
Expected term (years) 5 years        
2021 Pre-Funded Warrants          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0        
Number of Warrants Vested and Outstanding (in shares) | shares 19,666,667        
Underlying common stock price (in dollars per share) $ 0.09        
2021 Pre-Funded Warrants | Measurement Input, Expected Dividend Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.0000        
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 | Measurement Input, Risk Free Interest Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.0155        
2021 Pre-Funded Warrants | Measurement Input, Expected Term [Member]          
Class of Warrant or Right [Line Items]          
Expected term (years) 10 years        
2021 Common Stock Warrants to Placement Agent          
Class of Warrant or Right [Line Items]          
Exercise price (in dollars per share) $ 0.11        
Term (Years) 5 years        
Number of Warrants Vested and Outstanding (in shares) | shares 5,444,445        
Underlying common stock price (in dollars per share) $ 0.09        
2021 Common Stock Warrants to Placement Agent | Measurement Input, Expected Dividend Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.0000        
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 | Measurement Input, Risk Free Interest Rate [Member]          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding measurement input 0.0101        
2021 Common Stock Warrants to Placement Agent | Measurement Input, Expected Term [Member]          
Class of Warrant or Right [Line Items]          
Expected term (years) 5 years