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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