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

Commitments and Contingencies - Operating Leases (Details)

v3.21.2
Commitments and Contingencies - Operating Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Leased Assets [Line Items]              
Expense on recognition of a cease use liability $ 800   $ 800        
Operating leases future minimum lease obligations              
2021(for remaining three months) 1,550   1,550        
2021         $ 5,458    
2022 5,347   5,347   4,004    
2023 4,880   4,880   3,461    
2024 1,015   1,015   242    
2025 981   981        
2026 368   368        
Thereafter 76   76        
Total 14,217   14,217   13,165    
Office              
Operating Leased Assets [Line Items]              
Rent expense         5,900 $ 4,500 $ 3,300
Data center              
Operating Leased Assets [Line Items]              
Rent expense         $ 1,100 $ 1,500 $ 1,400
Office and data center              
Operating Leased Assets [Line Items]              
Rent expense $ 1,500 $ 1,800 $ 3,900 $ 5,300