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FAIR VALUE MEASUREMENTS (Q1) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 17, 2020
--- | --- | --- | --- | ---
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  | $ 18,462,000 | $ 23,530,000 | $ 16,109,000 | $ 16,290,000
Public Warrants [Member] |  |  |  |  |
Warrants [Abstract] |  |  |  |  |
Warrants outstanding (in shares) |  | 11,500,000 | 11,500,000 |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  |  | $ 23,530,000 |  |
Private Placement Warrants [Member] |  |  |  |  |
Warrants [Abstract] |  |  |  |  |
Warrants outstanding (in shares) |  | 6,600,000 | 6,600,000 |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  |  | $ 23,530,000 |  |
Cash [Member] |  |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |  |
Assets held in trust |  | $ 753 | 753 |  |
U.S. Treasury Money Market Mutual Funds [Member] |  |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |  |
Assets held in trust |  | 230,006,014 |  |  |
U.S. Treasury Bills [Member] |  |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |  |
Assets held in trust |  |  | 230,052,496 |  |
Recurring [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Cash and marketable securities held in Trust Account | [1] | 230,090,636 | 230,053,249 |  |
Recurring [Member] | Public Warrants [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  | 11,730,000 | 14,950,000 |  |
Recurring [Member] | Private Placement Warrants [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  | 6,732,000 | 8,580,000 |  |
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Cash and marketable securities held in Trust Account | [1] | 0 | 230,053,249 |  |
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Public Warrants [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  | 11,730,000 | 14,950,000 |  |
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Private Placement Warrants [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  | 0 | 0 |  |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Cash and marketable securities held in Trust Account | [1] | 0 | 0 |  |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Public Warrants [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  | 0 | 0 |  |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Private Placement Warrants [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  | 6,732,000 | 8,580,000 |  |
Recurring [Member] | Significant Other Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Cash and marketable securities held in Trust Account | [1] | 0 | 0 |  |
Recurring [Member] | Significant Other Unobservable Inputs (Level 3) [Member] | Public Warrants [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  | 0 | 0 |  |
Recurring [Member] | Significant Other Unobservable Inputs (Level 3) [Member] | Private Placement Warrants [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Warrant Liability |  | $ 0 | $ 0 |  |
[1] | In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the accompany financial statements.

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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