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Summary of Significant Accounting Policies - Warrant Liabilities (Q3) (Details) - $ / shares | Sep. 30, 2021 | Jun. 16, 2021
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Class A Common Stock |  |
Class of Warrant or Right [Line Items] |  |
Exercise price of warrant (in dollars per share) | $ 11.50 |
Minimum requirement for cash settlement as percent of stockholders |  | 50.00%
Public Warrants |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding (in shares) | 12,499,933 |
Private Placement Warrant |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding (in shares) | 7,000,000 | 7,000,000

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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