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Prepaid Expenses and Other Current Assets (FY) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |  |  |  |  |
Prepaid insurance | $ 422,000 |  | $ 422,000 |  | $ 1,530,000 | $ 2,869,000 |
Prepaid marketing | 354,000 |  | 354,000 |  | 387,000 | 2,321,000 |
Prepaid software | 2,233,000 |  | 2,233,000 |  | 2,406,000 | 2,762,000 |
Other prepaid expenses and other current assets | 2,538,000 |  | 2,538,000 |  | 1,655,000 | 1,010,000 |
Total | 5,547,000 |  | 5,547,000 |  | 5,978,000 | 8,962,000 |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment charges | $ 0 | $ 0 | $ 0 | $ 0 | 24,403,000 | 4,317,000 | $ 2,372,000
Abandoned Cloud Computing Arrangement |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment charges |  |  |  |  | $ 0 | $ 800,000 |

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