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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2015
Dec. 17, 2024
Jan. 01, 2024
Nov. 30, 2019
Nov. 20, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, par value (in dollars per share) $ 0.001   $ 0.001 $ 0.001     $ 0.001      
Fair value of options granted     $ 0.62 $ 0.52            
Granted 0   25,000              
Compensation expense not yet recognized $ 300   $ 300              
Weighted average period of compensation expense not yet recognized 1 year 3 months   1 year 4 months 17 days              
Compensation expense $ 80 $ 81 $ 319 $ 314            
Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Intrinsic value of options exercised $ 100 100 $ 100 $ 100            
Cara Therapeutics, Inc.                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, par value (in dollars per share) $ 0.001   $ 0.001 $ 0.001            
Intrinsic value of options exercised     $ 0 $ 476 $ 118          
Granted     84,587              
Excess tax benefits from stock option activity or stock-based compensation expense recognized in cash flows from operations $ 0 0 $ 0 0 0          
Cara Therapeutics, Inc. | Stock Options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation expense 1,100 1,733 6,290 11,607 13,648          
Cara Therapeutics, Inc. | Options Performance Shares [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation expense   0                
Cara Therapeutics, Inc. | Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation expense $ 326 $ 1,612 $ 2,639 $ 2,123 $ 4,086          
Cara Therapeutics, Inc. | Board of Directors Chairman [Member] | Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded         330          
Cara Therapeutics, Inc. | Employees And Non-Employee Members Of Board Of Directors [Member] | Share-based Payment Arrangement, Employee [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Fair value of options granted   $ 27.36                
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation arrangement by share-based payment award, number of shares authorized       338,973       384,373    
Number of stock options that may be granted after the tenth anniversary of the 2014 Plan 0   0              
Annual increases in number of shares reserved for issuance as a percentage of shares of capital stock outstanding through January 1, 2024           3.00%        
Granted 0 52,087                
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded 0 0                
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Term of awards granted 10 years   10 years              
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Maximum [Member] | Incentive Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation arrangement by share-based payment award, number of shares authorized           833,333        
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Director [Member] | Incentive Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period of awards granted 3 years   3 years              
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Employee And Nonemployee Consultants [Member] | Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded     25,108 16,699 13,172          
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Employee And Nonemployee Consultants [Member] | Share-Based Compensation Award, Tranche One [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of vested shares on first anniversary of grant date 25.00%   25.00%              
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Employee And Nonemployee Consultants [Member] | Share-based Compensation Award, Tranche Two [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period of awards granted 36 months   36 months              
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Employee And Nonemployee Consultants [Member] | Share Based Compensation Subsequent Awards [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period of awards granted 4 years   4 years              
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Employees And Non-Employee Members Of Board Of Directors [Member] | Stock Options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Fair value of options granted     $ 23.76 $ 207 $ 261          
Granted     84,587 55,685 52,776          
Compensation expense not yet recognized     $ 4,146              
Weighted average period of compensation expense not yet recognized     10 months 2 days              
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Employees And Non-Employee Members Of Board Of Directors [Member] | Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded     25,108              
Restricted stock units, grant date fair value     $ 23.76 $ 281.16 $ 363.6          
Restricted stock units, vested 792   10,390              
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Consultants | Stock Options | Nonemployee                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted     0 0 0          
Cara Therapeutics, Inc. | 2014 Equity Incentive Plan [Member] | Non-employee Consultants [Member] | Stock Options | Share-based Payment Arrangement, Employee [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted 0 0                
Cara Therapeutics, Inc. | 2019 Inducement Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, par value (in dollars per share)                   $ 0.001
Awarded 0 0                
Cara Therapeutics, Inc. | 2019 Inducement Plan [Member] | Incentive Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted     0 0 0          
Cara Therapeutics, Inc. | 2019 Inducement Plan [Member] | Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awarded 0 0 0 0 0          
Cara Therapeutics, Inc. | 2019 Inducement Plan [Member] | Share-Based Compensation Award, Tranche One [Member] | Share-based Payment Arrangement, Employee [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of vested shares on first anniversary of grant date 25.00%   25.00%              
Cara Therapeutics, Inc. | 2019 Inducement Plan [Member] | Share-based Compensation Award, Tranche Two [Member] | Share-based Payment Arrangement, Employee [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period of awards granted 36 months   36 months              
Cara Therapeutics, Inc. | 2019 Inducement Plan [Member] | Share Based Compensation Subsequent Awards [Member] | Share-based Payment Arrangement, Employee [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period of awards granted 4 years   4 years              
Cara Therapeutics, Inc. | 2019 Inducement Plan [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation arrangement by share-based payment award, number of shares authorized                 8,333