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Prepaid expenses - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Prepaid Expenses      
Other prepaid costs $ 35 $ 54 $ 36
Cara Therapeutics, Inc.      
Prepaid Expenses      
Prepaid expenses 1,592 529 8,154
Prepaid R&D clinical costs 5 13 7,245
Prepaid insurance 1,475 149 492
Other prepaid costs $ 112 $ 367 $ 417