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Commitments and Contingencies - Restructuring activity (Detail) - Cara Therapeutics, Inc. - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2024
Other Commitments [Line Items]          
Restructuring expenses $ 0     $ 2,401 $ 5,565
Total expense recorded in the three months ended for the period   $ 707 $ 2,581 $ 2,401 5,689
Provision for restructuring $ 0       50
Payments made in the three months ended for the period         (5,515)
Reversal of restructuring provision in the three months ended for the period         (124)
Remaining amounts to be paid as of period         $ 50