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RELATED PARTY TRANSACTIONS, Related Party Loans (Q1) (Details) - Sponsor or an Affiliate of the Sponsor, or Certain of the Company's Officers and Directors [Member] - Working Capital Loans [Member] - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Related Party Transactions [Abstract] |  |
Conversion price (in dollars per share) | $ 1.00 |
Outstanding balance | $ 0 | $ 0
Maximum [Member] |  |
Related Party Transactions [Abstract] |  |
Loans that can be converted into Warrants at lenders' discretion | $ 1,500,000 |

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- Details
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