Fair Value Measurements - Summary of Significant Inputs Not Observable in the Fair Value Measurements (Detail) - SAFE [Member] - Scenario-based approach [Member]	Dec. 31, 2024 yr
Discount rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	0.201
Minimum [Member] | Probability weighting [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	0.15
Minimum [Member] | Remaining term to event (in years) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	0.5
Maximum [Member] | Probability weighting [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	0.70
Maximum [Member] | Remaining term to event (in years) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liability measurement input	0.75