Quarterly report pursuant to Section 13 or 15(d)

Warrants and Derivative Liabilities - Schedule of warrants vested and outstanding (Details)

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Warrants and Derivative Liabilities - Schedule of warrants vested and outstanding (Details)
 3 Months Ended
Mar. 31, 2021
$ / shares
shares
Class of Warrant or Right [Line Items]  
Number of Warrants Vested and Outstanding (in shares) 78,546,668
Pre 2015 Common Stock Warrants  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) | $ / shares $ 1.00
Number of Warrants Vested and Outstanding (in shares) 1,110,000
Pre 2015 Common Stock Warrants | Minimum  
Class of Warrant or Right [Line Items]  
Term (Years) 6 years
Pre 2015 Common Stock Warrants | Maximum  
Class of Warrant or Right [Line Items]  
Term (Years) 10 years
2015 Common Stock Warrants  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) | $ / shares $ 5.00
Term (Years) 10 years
Number of Warrants Vested and Outstanding (in shares) 100,000
2016 Common Stock Warrants to Service Providers  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) | $ / shares $ 1.15
Term (Years) 10 years
Number of Warrants Vested and Outstanding (in 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) | $ / shares $ 0.40
Term (Years) 5 years
Number of Warrants Vested and Outstanding (in 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) | $ / shares $ 0.25
Term (Years) 5 years
Number of Warrants Vested and Outstanding (in shares) 480,000
2017 Common Stock Warrants to Service Provider  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) | $ / shares $ 0.41
Term (Years) 5 years
Number of Warrants Vested and Outstanding (in shares) 125,000
2018 Emerald Financing Warrants  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) | $ / shares $ 0.10
Term (Years) 5 years
Number of Warrants Vested and Outstanding (in shares) 3,400,000
Emerald Multi-Draw Credit Agreement Warrants  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) | $ / shares $ 0.50
Term (Years) 5 years
Number of Warrants Vested and Outstanding (in shares) 7,500,000
2019 Common Stock Warrants  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) | $ / shares $ 0.35
Term (Years) 5 years
Number of Warrants Vested and Outstanding (in shares) 8,000,000
2020 Common Stock Warrants  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) | $ / shares $ 0.06
Term (Years) 5 years
Number of Warrants Vested and Outstanding (in shares) 49,500,001
2020 Common Stock Warrants to Placement Agent  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) | $ / shares $ 0.075
Term (Years) 4 years 11 months 26 days
Number of Warrants Vested and Outstanding (in shares) 8,166,667