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FAIR VALUE MEASUREMENTS, Level 3 Fair Value Measurements (FY) (Details) | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 17, 2020 $ / shares
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Fair Value Measurements [Abstract] |  |  |
Term (in years) | 5 years | 5 years |
Warrant [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Measurement input |  |  | 0.90
Term (in years) |  |  | 1 year
Warrant [Member] | Unit Price [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Measurement input |  |  | 10.00
Warrant [Member] | Strike Price [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Measurement input |  |  | 11.50
Warrant [Member] | Volatility [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Measurement input |  |  | 16.00
Warrant [Member] | Risk-free Rate [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Measurement input |  |  | 0.38
Warrant [Member] | Dividend Yield [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Measurement input |  |  | 0

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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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