Share-based Compensation - Stock Option Granted to Employees (Details) - Employee - Employee Stock Option |
9 Months Ended | |
|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Volatility | 56.00% | |
| Risk free interest rate, minimum | 0.40% | 1.90% |
| Risk-free interest rate, maximum | 1.50% | 2.60% |
| Term (in years) | 6 years 3 months | 6 years 3 months |
| Dividend yield | 0.00% | 0.00% |
| Minimum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Volatility | 55.00% | |
| Maximum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Volatility | 60.00% | |