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

Property and Equipment - Summary of Property and Equipment (Detail)

v3.21.2
Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Total property and equipment   $ 35,083 $ 30,736
Less: accumulated depreciation   (21,374) (15,425)
Property and equipment (Net) $ 12,630 13,709 15,311
Computer Hardware      
Property, Plant and Equipment [Line Items]      
Total property and equipment   13,634 11,383
Computer software [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment   8,211 7,907
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment   2,284 2,170
Networking equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment   8,151 6,537
Leasehold Improvements      
Property, Plant and Equipment [Line Items]      
Total property and equipment   $ 2,803 $ 2,739