Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Jun. 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	$ 244,985	$ 245,886
Total short-term investments (available for sale), Gross Unrealized Gain	80	719
Total short-term investments (available for sale), Gross Unrealized (Loss)	(847)	(892)
Total short-term investments (available for sale), Fair value	244,218	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	302,912	239,859
Total short-term investments (available for sale), Gross Unrealized Gain	19	393
Total short-term investments (available for sale), Gross Unrealized (Loss)	(876)	(830)
Total short-term investments (available for sale), Fair value	302,055	239,422
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	547,897	485,745
Total short-term investments (available for sale), Gross Unrealized Gain	99	1,112
Total short-term investments (available for sale), Gross Unrealized (Loss)	(1,723)	(1,722)
Total short-term investments (available for sale), Fair value	$ 546,273	$ 485,135