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Recurring Fair Value Measurements, Changes in Fair Value of Warrant Liabilities (Q3) (Details) - Level 3 [Member] - USD ($) | 3 Months Ended | 10 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2021 | Dec. 31, 2022
Changes in Fair Value of Warrant Liabilities [Roll Forward] |  |  |  |  |
Fair value, beginning of period | $ 784,000 | $ 560,000 | $ 560,000 | $ 0 | $ 5,824,000
Change in fair value | 112,000 | 224,000 | 0 | (4,767,000) | (5,264,000)
Fair value, end of period | $ 896,000 | $ 784,000 | $ 560,000 | $ 5,824,000 | $ 560,000

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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