Quarterly report pursuant to Section 13 or 15(d)

Capitalization and Equity Structure - Valuation Assumptions (Details)

v3.20.2
Capitalization and Equity Structure - Valuation Assumptions (Details)
 9 Months Ended 12 Months Ended
Jun. 10, 2020
$ / shares
Sep. 30, 2020
$ / shares
Dec. 31, 2019
$ / shares
June 2020 Investor Warrants | Current share price      
Schedule of Capitalization, Equity [Line Items]      
Current share price (in dollars per share) $ 3.81 $ 4.75  
June 2020 Investor Warrants | Conversion price      
Schedule of Capitalization, Equity [Line Items]      
Conversion price (in dollars per share) $ 5.18 $ 5.18  
June 2020 Investor Warrants | Risk-free interest rate      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage 0.0039 0.0026  
June 2020 Investor Warrants | Expected term (years)      
Schedule of Capitalization, Equity [Line Items]      
Term (years) 5 years 6 months 5 years 2 months 8 days  
June 2020 Investor Warrants | Volatility of stock      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage 0.964 1.0412  
June 2020 Placement Agent Warrants | Current share price      
Schedule of Capitalization, Equity [Line Items]      
Current share price (in dollars per share) $ 3.81 $ 4.75  
June 2020 Placement Agent Warrants | Conversion price      
Schedule of Capitalization, Equity [Line Items]      
Conversion price (in dollars per share) $ 5.64 $ 5.64  
June 2020 Placement Agent Warrants | Risk-free interest rate      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage 0.0033 0.0026  
June 2020 Placement Agent Warrants | Expected term (years)      
Schedule of Capitalization, Equity [Line Items]      
Term (years) 5 years 4 years 8 months 8 days  
June 2020 Placement Agent Warrants | Volatility of stock      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage 0.963 1.0683  
December 2019 Warrants | Current share price      
Schedule of Capitalization, Equity [Line Items]      
Current share price (in dollars per share)   $ 4.75 $ 5.86
December 2019 Warrants | Conversion price      
Schedule of Capitalization, Equity [Line Items]      
Conversion price (in dollars per share)   $ 8.10 $ 8.10
December 2019 Warrants | Risk-free interest rate      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage   0.0026 0.0173
December 2019 Warrants | Expected term (years)      
Schedule of Capitalization, Equity [Line Items]      
Term (years)   4 years 8 months 19 days 5 years 6 months
December 2019 Warrants | Volatility of stock      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage   1.0684 0.957
December 2019 Placement Agent Warrants | Current share price      
Schedule of Capitalization, Equity [Line Items]      
Current share price (in dollars per share)   $ 4.75 $ 5.86
December 2019 Placement Agent Warrants | Conversion price      
Schedule of Capitalization, Equity [Line Items]      
Conversion price (in dollars per share)   $ 8.44 $ 8.44
December 2019 Placement Agent Warrants | Risk-free interest rate      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage   0.0023 0.0169
December 2019 Placement Agent Warrants | Expected term (years)      
Schedule of Capitalization, Equity [Line Items]      
Term (years)   4 years 2 months 19 days 5 years
December 2019 Placement Agent Warrants | Volatility of stock      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage   1.0979 0.931
May 2019 Warrants | Current share price      
Schedule of Capitalization, Equity [Line Items]      
Current share price (in dollars per share)   $ 4.75 $ 5.86
May 2019 Warrants | Conversion price      
Schedule of Capitalization, Equity [Line Items]      
Conversion price (in dollars per share)   $ 3.52 $ 5.70
May 2019 Warrants | Risk-free interest rate      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage   0.002 0.0167
May 2019 Warrants | Expected term (years)      
Schedule of Capitalization, Equity [Line Items]      
Term (years)   3 years 7 months 6 days 4 years 4 months 24 days
May 2019 Warrants | Volatility of stock      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage   1.133 0.939
2015 Warrants | Current share price      
Schedule of Capitalization, Equity [Line Items]      
Current share price (in dollars per share)   $ 4.75 $ 5.86
2015 Warrants | Conversion price      
Schedule of Capitalization, Equity [Line Items]      
Conversion price (in dollars per share)   $ 41.25 $ 41.25
2015 Warrants | Risk-free interest rate      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage   0.001 0.0159
2015 Warrants | Expected term (years)      
Schedule of Capitalization, Equity [Line Items]      
Term (years)   2 months 26 days 11 months 26 days
2015 Warrants | Volatility of stock      
Schedule of Capitalization, Equity [Line Items]      
Measurement input percentage   1.1052 0.9846