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Fair Value Measurements - Quantitative Information (Q2) (Details) $ in Thousands | Jun. 30, 2024 USD ($) $ / shares | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) $ / shares | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrant liability | $ | $ 975 | $ 1,435 | $ 585 | $ 2,410 | $ 1,365 | $ 2,090 | $ 27,460
Private Placement Warrants |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrant liability | $ | $ 350 | $ 560 | $ 210 | $ 910 | $ 490 | $ 840 | $ 10,710
Level 3 | Private Placement Warrants | Exercise price |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants, measurement input | $ / shares | 11.5 |  | 11.5 |  |  | 11.5 |
Level 3 | Private Placement Warrants | Stock price |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants, measurement input | $ / shares | 1.04 |  | 0.72 |  |  | 1.01 |
Level 3 | Private Placement Warrants | Volatility |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants, measurement input | 0.93 |  | 0.875 |  |  | 0.823 |
Level 3 | Private Placement Warrants | Term (years) |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants, term | 1 year 11 months 15 days |  | 2 years 5 months 15 days |  |  | 3 years 5 months 15 days |
Level 3 | Private Placement Warrants | Risk-free interest rate |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Warrants, measurement input | 0.0472 |  | 0.0413 |  |  | 0.0417 |

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