Financial Instruments and Fair Value Disclosures - Assets Measured at Fair Value on Nonrecurring and Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-Term Investments	$ 92,300
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Costs and Expenses	Costs and Expenses
Recurring Fair Value Measurements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-Term Investments	$ 92,308
Recurring Fair Value Measurements [Member] | Director [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liability-classified Director restricted stock units	(1,259)	$ (1,258)
Total Losses	(252)	(201)
Recurring Fair Value Measurements [Member] | Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-Term Investments	92,308
Recurring Fair Value Measurements [Member] | Level 1 [Member] | Director [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liability-classified Director restricted stock units	$ (1,259)	$ (1,258)