Financial Instruments - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amortized cost
Maturing within one year, Amortized cost	$ 41,168	$ 50,393
Maturing in one to five years, Amortized cost	0	0
Total available-for-sale securities, Amortized cost	41,168	50,393
Estimated Fair value
Maturing within one year, Estimated fair value	41,176	50,189
Maturing in one to five years, Estimated fair value	0	0
Total available-for-sale securities, Estimated fair value	$ 41,176	$ 50,189