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Summary of Significant Unobservable Inputs Used in Fair Value Measurements Categorized Within Level 3 of Fair Value Hierarchy (Detail) - Level 3 - Option Pricing Method
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Rate for Debt Investment | Discount Rate for Future Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount rate for future cash flows 38.5 38.5
Rate for Debt Investment | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount for lack of marketability (“DLOM”) 12  
Rate for Debt Investment | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility 29  
Rate for Debt Investment | Minimum | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount for lack of marketability (“DLOM”)   4
Rate for Debt Investment | Minimum | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility   28
Rate for Debt Investment | Maximum | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount for lack of marketability (“DLOM”)   12
Rate for Debt Investment | Maximum | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility   31
Rate for Equity Investment | Discount Rate for Future Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount rate for future cash flows 38.5 38.5
Rate for Equity Investment | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility 29  
Rate for Equity Investment | Minimum | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount for lack of marketability (“DLOM”) 12 6
Rate for Equity Investment | Minimum | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility   28
Rate for Equity Investment | Maximum | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount for lack of marketability (“DLOM”) 30 12
Rate for Equity Investment | Maximum | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility   31
Debt Securities | Discount Rate for Future Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% $ 90 $ 372
Changes of Fair Value, If the Rate of Input changes by +1% 121 262
Debt Securities | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 63 93
Changes of Fair Value, If the Rate of Input changes by +1% (63) (93)
Debt Securities | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 22 23
Changes of Fair Value, If the Rate of Input changes by +1% 86 24
Equity Securities | Discount Rate for Future Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 67 175
Changes of Fair Value, If the Rate of Input changes by +1% (58) (170)
Equity Securities | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 4 26
Changes of Fair Value, If the Rate of Input changes by +1% (3) (25)
Equity Securities | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 3 16
Changes of Fair Value, If the Rate of Input changes by +1% $ (2) $ (10)