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

Related Party Transactions - Summary of Related Party Transactions Outstanding (Detail)

v3.21.2
Related Party Transactions - Summary of Related Party Transactions Outstanding (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]      
Due to related parties $ 1,122 $ 1,615 $ 1,472
Interfusion B.V. [Member] | Related Party Loans [Member]      
Related Party Transaction [Line Items]      
Due to related parties 0 985 898
T-Fone B.V. [Member] | Related Party Loans [Member]      
Related Party Transaction [Line Items]      
Due to related parties $ 0 $ 630 $ 574