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Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Assets    
Total assets $ 727,345 $ 731,112
Money Market Funds    
Assets    
Total assets 96,611 131,635
U.S. Treasuries    
Assets    
Total assets 134,696 74,237
U.S. Government Agency Securities    
Assets    
Total assets 172,084 216,688
Corporate Debt Securities    
Assets    
Total assets 323,954 308,552
Fair Value, Inputs, Level 1    
Assets    
Total assets 96,611 131,635
Fair Value, Inputs, Level 1 | Money Market Funds    
Assets    
Total assets 96,611 131,635
Fair Value, Inputs, Level 1 | U.S. Treasuries    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 1 | U.S. Government Agency Securities    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 1 | Corporate Debt Securities    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 2    
Assets    
Total assets 630,734 599,477
Fair Value, Inputs, Level 2 | Money Market Funds    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 2 | U.S. Treasuries    
Assets    
Total assets 134,696 74,237
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities    
Assets    
Total assets 172,084 216,688
Fair Value, Inputs, Level 2 | Corporate Debt Securities    
Assets    
Total assets 323,954 308,552
Fair Value, Inputs, Level 3    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 3 | Money Market Funds    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 3 | U.S. Treasuries    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 3 | U.S. Government Agency Securities    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 3 | Corporate Debt Securities    
Assets    
Total assets $ 0 $ 0