Fair Value of Financial Instruments - Summary of Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial assets carried at fair value:
Cash equivalents, fair value disclosure	$ 183,873	$ 40,479
Short-term investments, available for sale	767,397	306,563
Total financial assets	951,270	347,042
Level 1 [Member]
Financial assets carried at fair value:
Cash equivalents, fair value disclosure	151,151	16,411
Total financial assets	151,151	16,411
Level 2 [Member]
Financial assets carried at fair value:
Cash equivalents, fair value disclosure	32,722	24,068
Total financial assets	800,119	330,631
Commercial paper, available-for-sale [Member]
Financial assets carried at fair value:
Short-term investments, available for sale	16,042	24,226
Commercial paper, available-for-sale [Member] | Level 2 [Member]
Financial assets carried at fair value:
Short-term investments, available for sale	16,042	24,226
Corporate debt securities, available-for-sale [Member]
Financial assets carried at fair value:
Short-term investments, available for sale	509,136	168,584
Corporate debt securities, available-for-sale [Member] | Level 2 [Member]
Financial assets carried at fair value:
Short-term investments, available for sale	509,136	168,584
Government debt securities [Member]
Financial assets carried at fair value:
Short-term investments, available for sale	242,219	113,753
Government debt securities [Member] | Level 2 [Member]
Financial assets carried at fair value:
Short-term investments, available for sale	$ 242,219	$ 113,753