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Income Taxes - Additional Information (FY) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance, deferred tax asset, increase | $ (400) | $ 187,000 |
Amortization period | 15 years |  |
Tax receivable agreement liability | $ 1,800 | 500 |
Unrecognized tax benefits | 1,024 | 920 | $ 188
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Loss carry forward |  | 57,800 |
Federal | Research |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward |  | 3,900 |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Loss carry forward |  | 51,100 |
State | Research | California |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward |  | $ 1,500 |
International |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Loss carry forward | $ 100 |  |

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