WARRANT LIABILITY (Q1) (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Warrants [Abstract]    
Period to exercise warrants after business combination 30 days 30 days
Period to exercise warrants after public offerings 12 months 12 months
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
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
Limitation period to transfer, assign or sell warrants 30 days 30 days
Class A Ordinary Shares [Member]    
Warrants [Abstract]    
Share price (in dollars per share) $ 18.00 $ 18.00
Percentage of exercise price of public warrants is adjusted higher than the market value of newly issued price 115.00% 115.00%
Percentage of redemption triggered price is adjusted higher than the market value of newly issued price 180.00% 180.00%
Class A Ordinary Shares [Member] | Minimum [Member]    
Warrants [Abstract]    
Share price (in dollars per share) $ 12.00 $ 12.00
Percentage of aggregate gross proceeds of issuance available for funding of business combination 60.00% 60.00%
Class A Ordinary Shares [Member] | Maximum [Member]    
Warrants [Abstract]    
Additional shares issued with the closing of business combination (in dollars per share) $ 9.20 $ 9.20