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Fair Value Measurements - Schedule of changes in fair value of warrant liabilities (Q3) (Details) - USD ($) | 3 Months Ended
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Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021
Public [Member] |  |  |
Fair Value Measurements (Details) - Schedule of changes in fair value of warrant liabilities [Line Items] |  |  |
Fair value opening balance | $ 12,650,000 | $ 12,190,000 |
Initial measurement |  |  | 11,960,000
Change in fair value of warrant liabilities | (3,335,000) | 460,000 | 230,000
Fair value ending balance | 9,315,000 | 12,650,000 | 12,190,000
Private Placement [Member] |  |  |
Fair Value Measurements (Details) - Schedule of changes in fair value of warrant liabilities [Line Items] |  |  |
Fair value opening balance | 6,586,000 | 6,348,666 |
Initial measurement |  |  | 6,230,000
Change in fair value of warrant liabilities | (1,720,667) | 237,334 | 118,666
Fair value ending balance | 4,865,333 | 6,586,000 | 6,348,666
Warrant Liabilities [Member] |  |  |
Fair Value Measurements (Details) - Schedule of changes in fair value of warrant liabilities [Line Items] |  |  |
Fair value opening balance | 19,236,000 | 18,538,666 |
Initial measurement |  |  | 18,190,000
Change in fair value of warrant liabilities | (5,055,667) | 697,334 | 348,666
Fair value ending balance | $ 14,180,333 | $ 19,236,000 | $ 18,538,666

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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