Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Share-Based Compensation (Details)

v3.20.4
Summary of Significant Accounting Policies - Share-Based Compensation (Details)
12 Months Ended
Dec. 31, 2020
Stock Options | Minimum  
Share-Based Compensation  
Vesting period 3 years
Stock Options | Maximum  
Share-Based Compensation  
Vesting period 5 years
Expiration period 10 years
Service-based conditions | Restricted Stock Awards | Minimum  
Share-Based Compensation  
Vesting period 3 years
Service-based conditions | Restricted Stock Awards | Maximum  
Share-Based Compensation  
Vesting period 5 years
Performance-based conditions | Restricted Stock Awards  
Share-Based Compensation  
Vesting period 3 years
Performance-based conditions | Restricted Stock Awards | Minimum  
Share-Based Compensation  
Expense measurement, payout range (as percent) 0.00%
Performance-based conditions | Restricted Stock Awards | Maximum  
Share-Based Compensation  
Expense measurement, payout range (as percent) 200.00%
Market-based conditions | Restricted Stock Awards  
Share-Based Compensation  
Vesting period 3 years