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Property and Equipment, net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 01, 2024
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property and Equipment, net            
Depreciation and amortization   $ 24 $ 24 $ 95 $ 95  
Cara Therapeutics, Inc.            
Property and Equipment, net            
Transfer of property and equipment per lease assignment       (3,417)    
Realized gain on sale of property and equipment       0 0 $ 0
Depreciation and amortization   $ 0 $ 42 $ 192 $ 259 $ 248
Cara Therapeutics, Inc. | Assignment of New Lease [Member]            
Property and Equipment, net            
Transfer of property and equipment per lease assignment $ (3,417)          
Realized gain on sale of property and equipment $ 0