Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Schedule of Assumptions Used to Determine Grant Date Fair Value of Employee and Director Options Granted (Details)

v3.21.2
Share-Based Compensation - Schedule of Assumptions Used to Determine Grant Date Fair Value of Employee and Director Options Granted (Details) - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Volatility, minimum 120.00% 90.30%
Volatility, maximum 130.00% 99.50%
Dividend rate 0.00% 0.00%
Risk-free interest rate, minimum 0.90% 0.18%
Risk-free interest rate, maximum 1.32% 0.78%
Minimum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term in years 5 years 6 months 5 years 6 months
Share price $ 0.56 $ 1.68
Fair value of option on grant date $ 0.50 $ 1.27
Maximum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term in years 6 years 3 months 6 years 3 months
Share price $ 2.01 $ 2.03
Fair value of option on grant date $ 1.75 $ 1.52