Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Assets:
Marketable securities	$ 878,128	$ 972,611
Fair Value Recurring [Member]
Assets:
Cash equivalents	103,218	135,902
Total assets	981,346	1,108,513
Fair Value Recurring [Member] \| Related Party Revenue Share Liability [Member]
Liabilities:
Total liabilities	25,410	17,940
Fair Value Recurring [Member] \| Commercial Paper [Member]
Assets:
Marketable securities	85,436	251,309
Fair Value Recurring [Member] \| Corporate bonds [Member]
Assets:
Marketable securities	570,392	468,617
Fair Value Recurring [Member] \| Government and agency securities [Member]
Assets:
Marketable securities	185,664	162,886
Fair Value Recurring [Member] \| U.S. treasury bills [Member]
Assets:
Marketable securities	36,636	89,799
Fair Value Recurring [Member] \| Fair value, inputs, level 1 [Member]
Assets:
Cash equivalents	103,218	135,902
Total assets	103,218	135,902
Fair Value Recurring [Member] \| Fair value, inputs, level 2 [Member]
Assets:
Total assets	878,128	972,611
Fair Value Recurring [Member] \| Fair value, inputs, level 2 [Member] \| Commercial Paper [Member]
Assets:
Marketable securities	85,436	251,309
Fair Value Recurring [Member] \| Fair value, inputs, level 2 [Member] \| Corporate bonds [Member]
Assets:
Marketable securities	570,392	468,617
Fair Value Recurring [Member] \| Fair value, inputs, level 2 [Member] \| Government and agency securities [Member]
Assets:
Marketable securities	185,664	162,886
Fair Value Recurring [Member] \| Fair value, inputs, level 2 [Member] \| U.S. treasury bills [Member]
Assets:
Marketable securities	36,636	89,799
Fair Value Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Related Party Revenue Share Liability [Member]
Liabilities:
Total liabilities	$ 25,410	$ 17,940