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Financial instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 60,782 $ 41,393
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 60,782 $ 41,393