Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock Options (Details)

v3.21.2
Stock-based Compensation - Stock Options (Details) - Stock Options [Member]
9 Months Ended
Sep. 30, 2021
Share-based compensation  
Minimum age required for employees to qualify for immediate vesting of award 55 years
Threshold years required for retirement age 70 years
Employees  
Share-based compensation  
Vesting period 3 years
Directors [Member]  
Share-based compensation  
Vesting period 1 year