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Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets:
Marketable securities	$ 799,065	$ 384,518
Fair Value Recurring [Member]
Assets:
Cash equivalents	332,707	327,055
Total assets	1,131,772	711,573
Fair Value Recurring [Member] | Related Party Revenue Share Liability [Member]
Liabilities:
Total liabilities	16,600
Fair Value Recurring [Member] | Commercial Paper [Member]
Assets:
Marketable securities	191,882	67,080
Fair Value Recurring [Member] | Corporate bonds [Member]
Assets:
Marketable securities	409,841	193,949
Fair Value Recurring [Member] | Government and agency securities [Member]
Assets:
Marketable securities	120,444	89,027
Fair Value Recurring [Member] | U.S. treasury bills [Member]
Assets:
Marketable securities	76,898	34,462
Fair Value Recurring [Member] | Fair value, inputs, level 1 [Member]
Assets:
Cash equivalents	332,707	327,055
Total assets	332,707	327,055
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member]
Assets:
Total assets	799,065	384,518
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member] | Commercial Paper [Member]
Assets:
Marketable securities	191,882	67,080
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member] | Corporate bonds [Member]
Assets:
Marketable securities	409,841	193,949
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member] | Government and agency securities [Member]
Assets:
Marketable securities	120,444	89,027
Fair Value Recurring [Member] | Fair value, inputs, level 2 [Member] | U.S. treasury bills [Member]
Assets:
Marketable securities	76,898	$ 34,462
Fair Value Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Related Party Revenue Share Liability [Member]
Liabilities:
Total liabilities	$ 16,600

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Fair value portion of asset recognized for present right to economic benefit.

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