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Debt - Additional Information (Detail) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Disclosure Of Borrowings [Line Items]    
Line of credit   $ 2,000,000
Weighted average interest rate 5.30% 5.11%
Accounts Payable and Accrued Liabilities    
Disclosure Of Borrowings [Line Items]    
Accrued interest payable $ 34,000 $ 189,000
Non-Revolving Variable Rate Term Loan 2021 [Member] | FCC Loan [Member]    
Disclosure Of Borrowings [Line Items]    
Securities pledged as collateral 223,788,000 86,664,000
Revolving Operating Loan [Member]    
Disclosure Of Borrowings [Line Items]    
Amounts drawn on facility 0 2,000,000
Securities pledged as collateral 28,414,000 23,443,000
Term Loan One [Member]    
Disclosure Of Borrowings [Line Items]    
Line of credit $ 0 $ 0