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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Assets:    
Assets $ 139,610 $ 27,278
Liabilities:    
Liabilities   30,515
SAFE Liabilities [Member]    
Liabilities:    
Liabilities   30,515
Money Market Funds [Member] | Cash Equivalents [Member]    
Assets:    
Assets 139,610 27,278
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Assets 139,610 27,278
Liabilities:    
Liabilities   0
Fair Value, Inputs, Level 1 [Member] | SAFE Liabilities [Member]    
Liabilities:    
Liabilities   0
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | Cash Equivalents [Member]    
Assets:    
Assets 139,610 27,278
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Assets 0 0
Liabilities:    
Liabilities   0
Fair Value, Inputs, Level 2 [Member] | SAFE Liabilities [Member]    
Liabilities:    
Liabilities   0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] | Cash Equivalents [Member]    
Assets:    
Assets 0 0
Fair Value, Inputs, Level 3 [Member]    
Assets:    
Assets 0 0
Liabilities:    
Liabilities   30,515
Fair Value, Inputs, Level 3 [Member] | SAFE Liabilities [Member]    
Liabilities:    
Liabilities   30,515
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] | Cash Equivalents [Member]    
Assets:    
Assets $ 0 $ 0