Fair Value Measurements - Additional Information (Detail) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Fair Value Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liability measured and recognized at fair value	$ 0	$ 0
Fair Value Measurements, Recurring | Fair Value, Level 1 | Money Market Accounts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents measured and recognized at fair value	60,000,000
Fair Value Measurements, Recurring | Fair Value, Level 1 | Treasury Bills
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents measured and recognized at fair value	65,000,000
Fair Value Measurements, Non-recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liability measured and recognized at fair value	0	0
Fair Value Measurements, Non-recurring | Fair Value, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Privately-held investments measured at fair value	$ 348,000	$ 348,000