Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Short-term, Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	$ 224,665	$ 245,886
Total short-term investments (available for sale), Gross Unrealized Gain	1,203	719
Total short-term investments (available for sale), Gross Unrealized (Loss)	(85)	(892)
Total short-term investments (available for sale), Fair value	225,783	245,713
Short-term, Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	257,488	239,859
Total short-term investments (available for sale), Gross Unrealized Gain	576	393
Total short-term investments (available for sale), Gross Unrealized (Loss)	(75)	(830)
Total short-term investments (available for sale), Fair value	257,989	239,422
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	482,153	485,745
Total short-term investments (available for sale), Gross Unrealized Gain	1,779	1,112
Total short-term investments (available for sale), Gross Unrealized (Loss)	(160)	(1,722)
Total short-term investments (available for sale), Fair value	$ 483,772	$ 485,135