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Stock Incentive Plans - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Nov. 13, 2023
USD ($)
$ / shares
shares
Jun. 30, 2024
shares
Jan. 31, 2024
shares
Jan. 31, 2023
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Mar. 27, 2024
Mar. 31, 2019
shares
Sep. 30, 2018
shares
Jun. 30, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock authorized and reserved for future issuance (in shares) | shares         11,512,268          
Stock‑based compensation expense         $ 6,582 $ 25,778        
Share based compensation arrangement by share based payment award, settlement of awards, amount (in dollars per share) | $ / shares $ 61.80                  
Share-based payment arrangement, accelerated cost $ 13,100                  
Total cash payment made to the holders of stock options and restricted stock units 9,400                  
Adjustments to additional paid in capital, settlement of outstanding equity awards at merger           6,169        
Excess over fair value recognized as additional stock-based compensation expense           $ 3,200        
Weighted average grant date fair value of stock options (in dollars per share) | $ / shares         $ 15.63 $ 26.90        
Intrinsic value of stock options exercised         $ 7,000          
Issuance of common stock upon exercise of options (in shares) | shares           0        
Preferred stock, convertible, conversion ratio         33.333   33.333      
Research and development                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock‑based compensation expense         $ 3,217 $ 12,985        
Share-based payment arrangement, accelerated cost 5,900                  
Excess over fair value recognized as additional stock-based compensation expense           1,500        
General and administrative                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock‑based compensation expense         $ 3,365 12,793        
Share-based payment arrangement, accelerated cost 7,200                  
Excess over fair value recognized as additional stock-based compensation expense           1,700        
Stock Options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock authorized and reserved for future issuance (in shares) | shares         1,706,035          
Restricted Stock Units (RSUs)                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting term         4 years          
Weighted average period for recognition         2 years 10 months 24 days          
Grants in period (in shares) | shares         477,037          
Grants in period (in dollars per share) | $ / shares         $ 19.86          
Estimated forfeitures rate         10.00%          
Vested in period (in shares) | shares         0          
Aggregate fair value of RSU awards vested           $ 700        
Unrecognized compensation expense         $ 5,400          
Common stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Issuance of common stock upon exercise of options (in shares) | shares         458,544          
Common stock | Stock Options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation expense related to unvested employee stock options         $ 10,300          
Weighted average period for recognition         2 years 10 months 24 days          
2016 Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized for grants (in shares) | shares                   40,341
Number of shares authorized, increase (in shares) | shares   3,466,544 215,903 204,056            
Common stock authorized and reserved for future issuance (in shares) | shares         3,520,174          
Employment Inducement Incentive Award Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized for grants (in shares) | shares         611,960          
Common stock authorized and reserved for future issuance (in shares) | shares   360,000     450,000 60,833   66,667 39,166  
Old Cartesian Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized for grants (in shares) | shares         27,270          
Award vesting term         4 years          
Award expiration term         10 years          
Share-based compensation arrangement by share-based payment award, options, outstanding, number (in shares) | shares         0 14,112.299        
Unrecognized compensation expense related to unvested employee stock options $ 2,600                  
Stock‑based compensation expense         $ 1,300 $ 200        
Old Cartesian Plan | Common stock | Old Cartestian                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation arrangement by share-based payment award, options, outstanding, number (in shares) | shares 776,865                  
Old Cartesian Plan | Preferred Stock | Old Cartestian                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation arrangement by share-based payment award, options, outstanding, number (in shares) | shares 14,112.299