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Fair Value Measurements (Q3) (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of company's assets fair value |
| ​ | ​ | September 30, 2021 | ​ | ​ | Quoted Prices In Active Markets (Level 1) | ​ | ​ | Significant Other Observable Inputs (Level 2) | ​ | ​ | Significant Other Unobservable Inputs (Level 3)
Description | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Assets: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Marketable Securities held in Trust Account | ​ | ​ | $345,030,985 | ​ | ​ | $345,030,985 | ​ | ​ | $— | ​ | ​ | $ —
Liabilities | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Forward purchase agreement liabilities | ​ | ​ | (8,991,000) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (8,991,000)
Warrant liabilities | ​ | ​ | (14,180,333) | ​ | ​ | (9,315,000) | ​ | ​ | — | ​ | ​ | (4,865,333)
| ​ | ​ | $321,859,652 | ​ | ​ | $335,715,985 | ​ | ​ | $— | ​ | ​ | $(13,856,333)
Schedule of quantitative information regarding Level 3 fair value measurements |
| ​ | ​ | At March 18, 2021 (Initial Measurement) | ​ | ​ | At September 30, 2021
Share price | ​ | ​ | 10.00 | ​ | ​ | $10.00
Strike price | ​ | ​ | 11.50 | ​ | ​ | $11.50
Term (in years) | ​ | ​ | 6.00 | ​ | ​ | 6.00
Volatility | ​ | ​ | 12.5% | ​ | ​ | 12.3%
Risk-free rate | ​ | ​ | 1.11% | ​ | ​ | 1.15%
Dividend yield | ​ | ​ | 0.0% | ​ | ​ | 0.0%
Schedule of changes in fair value of warrant liabilities |
| ​ | ​ | Public | ​ | ​ | Private Placement | ​ | ​ | Warrant Liabilities
Fair value as of December 31, 2020 | ​ | ​ | $ | ​ | ​ | $ | ​ | ​ | $
Initial measurement on March 18, 2021 | ​ | ​ | 11,960,000 | ​ | ​ | 6,230,000 | ​ | ​ | 18,190,000
Change in fair value of warrant liabilities | ​ | ​ | 230,000 | ​ | ​ | 118,666 | ​ | ​ | 348,666
Fair value as of March 31, 2021 | ​ | ​ | $12,190,000 | ​ | ​ | $6,348,666 | ​ | ​ | $18,538,666
Change in fair value of warrant liabilities | ​ | ​ | 460,000 | ​ | ​ | 237,334 | ​ | ​ | 697,334
Fair value as of June 30, 2021 | ​ | ​ | $12,650,000 | ​ | ​ | $6,586,000 | ​ | ​ | $19,236,000
Change in fair value of warrant liabilities | ​ | ​ | (3,335,000) | ​ | ​ | (1,720,667) | ​ | ​ | (5,055,667)
Fair value as of September 30, 2021 | ​ | ​ | $ 9,315,000 | ​ | ​ | $ 4,865,333 | ​ | ​ | $ 14,180,333
Schedule of change in the derivative liability forward purchase agreement |
| ​ | ​ | FPA Liabilities
Derivative liability — forward purchase agreement at March 18, 2021 | ​ | ​ | $ 11,655,000
Change in fair value of derivative liability — forward purchase agreement | ​ | ​ |
Derivative liability — forward purchase agreement at March 31, 2021 | ​ | ​ | $ 11,655,000
Change in fair value of derivative liability — forward purchase agreement | ​ | ​ | 666,000
Derivative liability — forward purchase agreement at June 30, 2021 | ​ | ​ | $ 12,321,000
Change in fair value of derivative liability — forward purchase agreement | ​ | ​ | (3,330,000)
Derivative liability — forward purchase agreement at September 30, 2021 | ​ | ​ | $ 8,991,000

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of derivative liabilities at fair value. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (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 (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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