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SHAREHOLDERS' EQUITY (DEFICIT) - Conversion of Preferred Stock, Founder, and Public Shares (FY) (Details) $ / shares in Units, $ in Thousands |  | 11 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 01, 2023 USD ($) $ / shares shares | Nov. 30, 2023 USD ($) shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2021 USD ($) shares | Mar. 31, 2024 shares | Dec. 31, 2022 USD ($) shares
Conversion of Stock [Line Items] |  |  |  |  |  |
Collection on subscription receivable | $ |  |  | $ 15 |  |  |
Preferred Stock outstanding (in shares) |  |  | 0 |  |  |
Exchange ratio | 1.01508 |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 0 |  | 0 | 0
PACI Public Shareholders | Proof Acquisition Corp I |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Stock issued during period (in shares) | 1,767,390 |  |  |  |  |
PACI Sponsors | Proof Acquisition Corp I |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Stock issued during period (in shares) | 6,883,579 |  |  |  |  |
2022 Convertible Notes | Convertible Debt |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ |  | $ 19,100 |  |  |  | $ 18,900
Accrued interest | $ |  | 800 |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 5.982 |  |  |  |  |
2023 Convertible Notes | Convertible Debt |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ | $ 18,420 | 18,400 | $ 18,420 |  |  |
Accrued interest | $ | $ 34 | $ 100 |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 9 |  |  |  |  |
Series Seed Preferred Stock |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Stock issued during period (in shares) |  |  |  | 3,981,236 |  |
Stock issued during the period, value | $ |  |  |  | $ 4,585 |  |
Preferred Stock outstanding (in shares) | 3,981,236 |  |  |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) | 4,041,282 |  |  |  |  |
Series A-1 Preferred Stock |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Stock issued during period (in shares) |  |  | 2,411,087 |  |  |
Stock issued during the period, value | $ |  |  | $ 24,200 |  |  |
Preferred Stock outstanding (in shares) | 2,411,087 |  |  |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) | 2,447,453 |  |  |  |  |
Series A-2 Preferred Stock |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Preferred Stock outstanding (in shares) | 3,327,624 |  |  |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) | 3,377,812 |  |  |  |  |
Preferred stock, shares issued (in shares) | 3,327,624 |  |  |  |  |
Series A-2 Preferred Stock | 2022 Convertible Notes | Convertible Debt |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Shares issued in relation to convertible notes (in shares) |  | 3,327,624 |  |  |  |
Series A-3 Preferred Stock |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Preferred Stock outstanding (in shares) | 2,050,628 |  |  |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) | 2,081,556 |  |  |  |  |
Series A-3 Preferred Stock | 2023 Convertible Notes | Convertible Debt |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |
Stock issued during period (in shares) |  | 2,050,628 |  |  |  |
Shares issued in relation to convertible notes (in shares) |  | 2,050,628 |  |  |  |

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