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Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2021
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cash and cash equivalents maturity period, maximum     90 days    
Short-term lease exception - Lease term   12 months 12 months    
Proceeds from the sale of securities owned, at fair value     $ 19,441 $ 18,703 $ 11,880
Purchase of securities owned, at fair value     115,526 36,444 22,536
Adjustment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Amounts collected on behalf of third parties       3,787 1,875
Proceeds from the sale of securities owned, at fair value       18,703 11,880
Purchase of securities owned, at fair value       $ 36,444 $ 22,536
Accounting Standards Update 2020-06 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reduction of interest expense per quarter   $ 420 $ 1,680    
Reduction of accumulated deficit $ 616        
Increase in carrying value of convertible notes 4,088        
Decrease in additional paid in capital 3,682        
Decrease in deferred tax liability $ 1,022