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v3.21.2

Summary of Significant Accounting Policies - Additional Information (Q3) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance of bad debt | $ 3,000,000.0 |  | $ 3,000,000.0 |  | $ 857,382 | $ 913,715 |
Deferred revenue | 7,800,000 |  | 7,800,000 |  | 5,300,000 |  |
Income tax expense (benefit) | (393,000) | $ 0 | (242,000) | $ 0 | 0 | (1,321,045) | $ 0
Advertising expense | 4,100,000 | 2,400,000 | 11,900,000 | 6,700,000 | 10,600,000 | 20,600,000 | 6,600,000
Political contributions | $ 200,000 | $ 300,000 | $ 500,000 | $ 600,000 | 773,370 | $ 915,250 | $ 795,275
Number of reportable segments | segment |  |  | 1 |  |  |  |
Tax receivable agreement liabilities as percent of expected benefit | 85.00% |  | 85.00% |  |  |  |
Tax receivable agreement, percent recorded in additional paid-in capital | 15.00% |  | 15.00% |  |  |  |
Equity securities without readily determinable fair value | $ 3,000,000.0 |  | $ 3,000,000.0 |  |  |  |
Operating lease, right-of-use asset | 37,673,000 |  | 37,673,000 |  | 43,300,000 |  |
Operating lease liabilities | $ 46,069,000 |  | $ 46,069,000 |  | $ 48,400,000 |  |
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% |  |  |  |
Silver Spike | Legacy WMH Class A Unit holders |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of voting interests held (over 50%) | 50.00% |  | 50.00% |  |  |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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