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WARRANTS (Q1) (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Warrants [Abstract] |  |
Expiration period of warrants | 5 years | 5 years
Number of days to file registration statement | 15 days | 15 days
Period for registration statement to become effective | 60 days | 60 days
Minimum [Member] |  |
Warrants [Abstract] |  |
Period for warrants to become exercisable upon closing of business combination | 30 days | 30 days
Maximum [Member] |  |
Warrants [Abstract] |  |
Period for warrants to become exercisable after IPO | 12 months | 12 months
Class A Common Stock [Member] | Maximum [Member] | Private Placement Warrant [Member] |  |
Warrants [Abstract] |  |
Share price (in dollars per share) | $ 18.00 | $ 18.00
Class A Common Stock [Member] | Additional Issue of Common Stock or Equity-linked Securities [Member] |  |
Warrants [Abstract] |  |
Warrant redemption price (in dollars per share) | $ 18.00 | $ 18.00
Percentage of newly issued price to be adjusted to exercise price of warrants | 115.00% | 115.00%
Percentage of newly issued price to be adjusted to redemption trigger price | 180.00% | 180.00%
Warrant redemption trigger price (in dollars per share) | $ 10.00 | $ 10.00
Period for warrants to become exercisable | 30 days | 30 days
Class A Common Stock [Member] | Additional Issue of Common Stock or Equity-linked Securities [Member] | Minimum [Member] |  |
Warrants [Abstract] |  |
Percentage of aggregate gross proceeds from such issuances newly issued price | 60.00% | 60.00%
Class A Common Stock [Member] | Additional Issue of Common Stock or Equity-linked Securities [Member] | Maximum [Member] |  |
Warrants [Abstract] |  |
Share price (in dollars per share) | $ 9.20 | $ 9.20
Redemption of Warrants When Price Exceeds $18.00 [Member] | Class A Common Stock [Member] |  |
Warrants [Abstract] |  |
Warrant redemption price (in dollars per share) | $ 0.01 | $ 0.01
Notice period to redeem warrants | 30 days | 30 days
Number of trading days | 20 days | 20 days
Trading day threshold period | 30 days | 30 days
Redemption of Warrants When Price Exceeds $18.00 [Member] | Class A Common Stock [Member] | Minimum [Member] |  |
Warrants [Abstract] |  |
Share price (in dollars per share) | $ 18.00 | $ 18.00
Redemption of Warrants When Price Exceeds $10.00 [Member] | Class A Common Stock [Member] |  |
Warrants [Abstract] |  |
Warrant redemption price (in dollars per share) | $ 0.10 | $ 0.10
Notice period to redeem warrants | 30 days | 30 days
Number of trading days | 20 days | 20 days
Trading day threshold period | 30 days | 30 days
Redemption of Warrants When Price Exceeds $10.00 [Member] | Class A Common Stock [Member] | Minimum [Member] |  |
Warrants [Abstract] |  |
Share price (in dollars per share) | $ 10.00 | $ 10.00

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