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Summary of Significant Accounting Policies - Additional Information (Q2) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) institution | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) institution segment | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) segment financialInstitutions | Dec. 31, 2022 USD ($) financialInstitutions | Dec. 31, 2021 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2020 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance of bad debt | $ 2,756,000 | $ 10,202,000 |  | $ 2,756,000 | $ 10,202,000 |  | $ 8,748,000 | $ 12,232,000 | $ 5,169,000 | $ 6,596,000 | $ 11,822,000 | $ 857,000
Amortization of right-of-use lease assets | 0 | 0 |  | 0 | 0 |  | 24,403,000 | 4,317,000 | 2,372,000 |  |  |
Capitalized software costs, net | 24,400,000 |  |  | 24,400,000 |  |  | 23,100,000 |  |  |  |  |
Capitalized computer software, amortization | 2,800,000 | 1,700,000 |  | 5,300,000 | 3,200,000 |  | 7,700,000 | 5,100,000 | 100,000 |  |  |
Goodwill | 68,368,000 |  |  | 68,368,000 |  |  | 68,368,000 | 68,368,000 |  |  |  |
Goodwill and intangible asset impairment | 0 | 0 |  | 0 | 0 |  |  |  |  |  |  |
Operating Lease, Impairment Loss | 0 | 0 |  | 0 | 0 |  | 10,900,000 | 600,000 | 2,400,000 |  |  |
Lease, cost | 2,000,000 | 2,200,000 |  | 4,200,000 | 4,400,000 |  | 8,846,000 | 9,074,000 | 11,534,000 |  |  |
Payments for lease termination | 100,000 |  |  | 100,000 |  |  |  |  |  |  |  |
Gain on lease termination | 100,000 |  |  | 109,000 | 0 | [1] |  |  |  |  |  |
Derecognizing on right of use asset | 200,000 |  |  | 200,000 |  |  |  |  |  |  |  |
Derecognition on lease liability | 400,000 |  |  | 400,000 |  |  |  |  |  |  |  |
Contra rent expense | $ 500,000 | 500,000 |  | $ 1,100,000 | 1,100,000 |  | $ 2,200,000 | 1,900,000 | 200,000 |  |  |
Tax receivable agreement liabilities as percent of expected benefit | 85.00% |  |  | 85.00% |  |  | 85.00% |  |  |  |  |
Tax receivable agreement, percent recorded in additional paid-in capital | 15.00% |  |  | 15.00% |  |  | 15.00% |  |  |  |  |
Tax receivable agreement, liability | $ 2,600,000 |  |  | $ 2,600,000 |  |  | $ 1,800,000 |  |  |  |  |
Change in tax receivable agreement liability | 395,000 | 520,000 | [2] | 938,000 | 620,000 | [2] | 1,256,000 | (142,352,000) | 0 |  |  |
Advertising expense | 3,800,000 | 3,500,000 |  | $ 6,300,000 | 4,600,000 |  | $ 11,800,000 | 14,400,000 | 17,700,000 |  |  |
Requisite service period |  |  |  | 2 years |  |  | 2 years |  |  |  |  |
Defined contribution cost | 500,000 | 400,000 |  | $ 900,000 | 900,000 |  | $ 2,300,000 | 2,400,000 | 1,500,000 |  |  |
Provision for income taxes | $ 42,000 | $ 0 | [2] | $ 51,000 | $ 0 | [2] | $ 93,000 | $ 179,077,000 | $ (601,000) |  |  |
Number of operating segments | segment |  |  |  | 1 |  |  | 1 |  |  |  |  |
Number of reportable segments | segment |  |  |  | 1 |  |  | 1 |  |  |  |  |
Number of financial institutions with cash balance exceeding FDIC limit | 4 |  |  | 4 |  |  | 5 | 4 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employer matching contribution, percent of match |  |  |  | 3.50% |  |  | 3.50% |  |  |  |  |
Class A Common Stock, $0.0001 par value per share |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payment to continuing members as percent of amount of tax benefit | 85.00% |  |  | 85.00% |  |  | 85.00% |  |  |  |  |
Computer equipment |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life | 3 years |  |  | 3 years |  |  | 3 years |  |  |  |  |
Furniture and fixtures |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life | 7 years |  |  | 7 years |  |  | 7 years |  |  |  |  |
Software Development [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life | 3 years |  |  | 3 years |  |  | 3 years |  |  |  |  |
Enhancements |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life | 3 years |  |  | 3 years |  |  | 3 years |  |  |  |  |
[1] | For the six months ended June 30, 2023, provision (benefit) for credit losses and change in accounts receivable 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.
[2] | 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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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479365/842-20-25-6 + Details
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