RELATED PARTY TRANSACTIONS, Related Party Loans (FY) (Details) - Sponsor, Affiliate of Sponsor, or Certain of the Company's Officers and Directors [Member] - Working Capital Loans [Member] - USD ($) |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2021 |
Dec. 31, 2020 |
|
| Related Party Transactions [Abstract] | ||
| Amount of related party transaction | $ 1,500,000 | $ 1,500,000 |
| Share price (in dollars per share) | $ 1.00 | $ 1.00 |