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Fair Value Measurements - Summary of Significant Unobservable Inputs Used in Valuing Developmental Milestone Derivative Liabilities (Detail)
$ in Thousands
Jun. 30, 2025
USD ($)
yr
Dec. 31, 2024
USD ($)
yr
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Fair Value | $ $ 5,700 $ 3,150
Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Fair Value | $ $ 5,700 $ 3,150
Level 3 [Member] | Probability of Achieving Certain Development Milestones [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 0.28 0.28
Level 3 [Member] | Probability of Achieving Certain Development Milestones [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 0.70 0.70
Level 3 [Member] | Probability of Achieving Certain Development Milestones [Member] | Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 0.49 0.49
Level 3 [Member] | Volatility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 0.93 0.85
Level 3 [Member] | Volatility [Member] | Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 0.93 0.85
Level 3 [Member] | Discount Rate [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 0.037 0.042
Level 3 [Member] | Discount Rate [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 0.043 0.043
Level 3 [Member] | Discount Rate [Member] | Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 0.04 0.043
Level 3 [Member] | Timing of Achieving Certain Development Milestones [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 0.5 1
Level 3 [Member] | Timing of Achieving Certain Development Milestones [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 3.2 3.7
Level 3 [Member] | Timing of Achieving Certain Development Milestones [Member] | Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Liabilities, Unobservable Input 1.8 2.3