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Convertible Preferred Stock - Series A Preferred Stock (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Oct. 11, 2024
shares
Sep. 25, 2024
shares
Apr. 08, 2024
shares
Feb. 11, 2024
shares
Jan. 12, 2024
shares
Dec. 13, 2023
shares
Dec. 05, 2023
shares
Nov. 15, 2023
USD ($)
shares
Nov. 13, 2023
USD ($)
shares
Nov. 30, 2023
USD ($)
Dec. 31, 2024
shares
Feb. 11, 2025
shares
Jan. 12, 2025
shares
Mar. 26, 2024
business_day
Dec. 31, 2023
shares
Class of Stock [Line Items]                              
Temporary equity, shares authorized (in shares)                 548,375   0       548,375
Derivative liability, shares (in shares)           49,570.162     148,710.488            
Number of business days | business_day                           8  
Convertible preferred stock, shares that did not automatically convert (in shares)     166,341.592                        
Subsequent Event                              
Class of Stock [Line Items]                              
Derivative liability, shares (in shares)                       49,570.163 49,570.163    
Common stock                              
Class of Stock [Line Items]                              
Conversion of Series A and Series B preferred stock to common stock (in shares) 1,518,373 2,499,976 12,263,951                        
Series A Preferred Stock                              
Class of Stock [Line Items]                              
Conversion of Series A and Series B preferred stock to common stock (in shares) 45,551.19   367,919.247                        
Series A Preferred Stock | Common stock                              
Class of Stock [Line Items]                              
Conversion of Series A and Series B preferred stock to common stock (in shares)                     13,782,324        
Old Cartesian | Preferred Stock                              
Class of Stock [Line Items]                              
Issuance of shares (in shares)             384,930.724                
Old Cartesian | Preferred Stock | Series A Preferred Stock                              
Class of Stock [Line Items]                              
Issuance of shares (in shares)                 384,930.724            
2023 Securities Purchase Agreement                              
Class of Stock [Line Items]                              
Sale of stock, number of shares issued in transaction (in shares)                 149,330.115            
Sale of stock, consideration received on transaction | $                 $ 60,250            
2023 Private Placement                              
Class of Stock [Line Items]                              
Sale of stock, number of shares issued in transaction (in shares)               619.627              
Sale of stock, consideration received on transaction | $               $ 250              
2023 Private Placement, Tranche One                              
Class of Stock [Line Items]                              
Sale of stock, number of shares issued in transaction (in shares)           24,785.081                  
Sale of stock, consideration received on transaction | $                   $ 10,000          
Sale of stock, settlement term                   30 days          
2023 Private Placement, Tranche Three                              
Class of Stock [Line Items]                              
Sale of stock, number of shares issued in transaction (in shares)       49,570.163                      
Sale of stock, consideration received on transaction | $                   $ 20,000          
Sale of stock, settlement term                   90 days          
2023 Private Placement, Tranche Two                              
Class of Stock [Line Items]                              
Sale of stock, number of shares issued in transaction (in shares)         49,570.163                    
Sale of stock, consideration received on transaction | $                   $ 20,000          
Sale of stock, settlement term                   60 days