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Fair Value Measurements - Warrants (FY) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 16, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total warrant liability | $ 975 | $ 2,410 |  | $ 975 | $ 2,410 |  | $ 27,460 | $ 585 | $ 2,090 | $ 27,460 |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Fair value, beginning of period | 1,435 | 1,365 |  | 585 | 2,090 |  |  | 2,090 | 27,460 |  |
Change in valuation inputs or other assumptions | (460) | 1,045 | [1] | 390 | 320 | [1] | (166,500) | (1,505) | (25,370) | (166,518) |
Fair value, end of period | 975 | 2,410 |  | 975 | 2,410 |  | 27,460 | 585 | 2,090 | 27,460 |
Warrants |  |  |  |  |  |  |  |  |  |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Remaining maturity |  |  |  |  |  |  |  |  |  |  | 5 years
Public Warrants |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total warrant liability | 625 | 1,500 |  | 625 | 1,500 |  | 16,750 | 375 | 1,250 | 16,750 |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Fair value, beginning of period | 875 | 875 |  | 375 | 1,250 |  |  | 1,250 | 16,750 |  |
Change in valuation inputs or other assumptions | (250) | 625 |  | 250 | 250 |  |  | (875) | (15,500) |  |
Fair value, end of period | 625 | 1,500 |  | 625 | 1,500 |  | 16,750 | 375 | 1,250 | 16,750 |
Private Placement Warrants |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total warrant liability | 350 | 910 |  | 350 | 910 |  | 10,710 | 210 | 840 | 10,710 |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Fair value, beginning of period | 560 | 490 |  | 210 | 840 |  |  | 840 | 10,710 |  |
Change in valuation inputs or other assumptions | (210) | 420 |  | 140 | 70 |  |  | (630) | (9,870) |  |
Fair value, end of period | 350 | $ 910 |  | 350 | 910 |  | $ 10,710 | 210 | 840 | $ 10,710 |
Recurring Basis |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total warrant liability |  |  |  |  |  |  |  | 585 | 2,090 |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Fair value, beginning of period |  |  |  | 585 | 2,090 |  |  | 2,090 |  |  |
Fair value, end of period |  |  |  |  |  |  |  | 585 | 2,090 |  |
Recurring Basis | Level 1 | Public Warrants |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total warrant liability | 625 |  |  | 625 |  |  |  | 375 | 1,250 |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Fair value, beginning of period |  |  |  | 375 | 1,250 |  |  | 1,250 |  |  |
Fair value, end of period | 625 |  |  | 625 |  |  |  | 375 | 1,250 |  |
Recurring Basis | Level 3 | Private Placement Warrants |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total warrant liability | 350 |  |  | 350 |  |  |  | 210 | 840 |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Fair value, beginning of period |  |  |  | 210 | $ 840 |  |  | 840 |  |  |
Fair value, end of period | $ 350 |  |  | $ 350 |  |  |  | $ 210 | $ 840 |  |
[1] | For the three and six months ended June 30, 2023, net revenues and general and administrative expenses have been retrospectively adjusted to reflect the restatement of previously reported revenue and credit losses. See Note 2, “Summary of Significant Accounting Policies,” for further information.

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