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Convertible Preferred Stock - Series A Preferred Stock (Narrative) (Details) $ in Thousands |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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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 |  |  |  |  |

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