Investments and Other Assets - Schedule of Investments and Other Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Investments, All Other Investments [Abstract]
Investment in Kyverna Therapeutics, Inc.	$ 29,158	$ 10,000
Other investments	24,213	14,760
Restricted cash, long-term	13,605	13,605	$ 11,958
Prepaid expenses and other assets, long-term	3,981	4,518
Total investments and other assets	$ 70,957	$ 42,883