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Financial instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Carrying amount    
Financial instruments:    
Cash and cash equivalents $ 46,268 $ 60,782
Fair value    
Financial instruments:    
Cash and cash equivalents $ 46,268 $ 60,782