General form of registration statement for all companies including face-amount certificate companies

Stock-Based Compensation (Details)

v3.21.2
Stock-Based Compensation (Details) - shares
shares in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 20, 2017
2017 Equity Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized     22,182
Term of award 10 years 10 years  
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years 4 years  
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years 2 years