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
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Volatility 120.00%  
Volatility, minimum   90.30%
Volatility, maximum   99.50%
Dividend rate 0.00% 0.00%
Risk-free interest rate, minimum 0.90% 0.18%
Risk-free interest rate, maximum 1.29% 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 $ 1.99 $ 1.68
Fair value of option on grant date $ 1.70 $ 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