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Share-based Compensation - Stock Options Granted to Non-employees (Details) - Non-employee - Employee Stock Option - Consultant
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility 60.00%  
Risk-free interest rate 1.60%  
Term (in years) 10 years 10 years
Dividend yield 0.00% 0.00%
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility   56.00%
Risk-free interest rate   0.60%
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility   60.00%
Risk-free interest rate   1.60%