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Stock Incentive Plans - Schedule of Weighted Average Assumptions Used (Details) - Stock Options - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 4.02% 3.95%
Dividend yield 0.00% 0.00%
Expected term 6 years 2 months 15 days 5 years 11 months 8 days
Expected volatility 95.21% 94.64%
Weighted-average fair value of common stock and preferred stock (in dollars per share) $ 19.63 $ 34.54
Common stock | Old Cartestian    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 4.83%  
Dividend yield 0.00%  
Expected term 3 years 7 months 2 days  
Expected volatility 83.77%  
Weighted-average fair value of common stock and preferred stock (in dollars per share) $ 12.00  
Preferred Stock | Old Cartestian    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 4.92%  
Dividend yield 0.00%  
Expected term 3 years 3 months 14 days  
Expected volatility 83.87%  
Weighted-average fair value of common stock and preferred stock (in dollars per share) $ 403.47