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

Prepaid and Other Assets - Summary of Prepaid Expenses and Other Receivables (Detail)

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Prepaid and Other Assets - Summary of Prepaid Expenses and Other Receivables (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Prepaid Expense and Other Assets, Current [Abstract]      
Prepaid Deposits $ 4,906 $ 1,734  
Prepaid Expenses 5,598 3,695  
Other Receivables 4,036 0  
Total Prepaid Expenses and Other Receivables $ 14,540 $ 5,429 $ 3,331