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Commitments, Contingencies and Related Party Transactions - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 29, 2021
Mar. 29, 2021
Dec. 31, 2020
Nov. 26, 2019
Nov. 25, 2019
Loss Contingencies [Line Items]                    
Letters of credit outstanding, amount   $ 0   $ 0       $ 0    
Rent expense   998,000 $ 835,000 2,748,000 $ 2,239,000          
Interest expense - related party   0 141,000 137,000 420,000          
Management fees   0 280,000 350,000 280,000          
Subordinated debt - related party                    
Loss Contingencies [Line Items]                    
Debt agreement, maximum available amount   $ 0   0     $ 4,000,000      
Interest expense - related party     $ 141,000 $ 137,000 $ 420,000          
Affiliated Entity | Management Fee Agreement Termination                    
Loss Contingencies [Line Items]                    
Related party transaction costs $ 3,000,000                  
Letter of Credit                    
Loss Contingencies [Line Items]                    
Debt agreement, maximum available amount           $ 1,750,000     $ 1,000,000 $ 1,500,000