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FAIR VALUE MEASUREMENTS (Q1) (Details) - USD ($)
3 Months Ended 5 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Jun. 06, 2019
Liabilities [Abstract]          
Warrant liability $ 141,900,000 $ 13,065,000 $ 13,260,000 $ 63,680,000 $ 0
Changes in Fair Value of Warrant Liabilities [Roll Forward]          
Fair value 63,680,000 13,260,000 17,905,000 13,260,000  
Change in valuation inputs or other assumptions 78,220,000 (195,000) (4,645,000) 50,420,000  
Fair value 141,900,000 13,065,000 13,260,000 63,680,000  
Transfers into Level 3 0     0  
Transfers out of Level 3 0     0  
Public Warrants [Member]          
Liabilities [Abstract]          
Warrant liability 88,000,000 4,875,000 5,000,000 41,000,000 0
Changes in Fair Value of Warrant Liabilities [Roll Forward]          
Fair value 41,000,000 5,000,000 10,625,000 5,000,000  
Change in valuation inputs or other assumptions 47,000,000 (125,000) (5,625,000) 36,000,000  
Fair value 88,000,000 4,875,000 5,000,000 41,000,000  
Private Placement Warrants [Member]          
Liabilities [Abstract]          
Warrant liability 53,900,000 8,190,000 8,260,000 22,680,000 $ 0
Changes in Fair Value of Warrant Liabilities [Roll Forward]          
Fair value 22,680,000 8,260,000 7,280,000 8,260,000  
Change in valuation inputs or other assumptions 31,220,000 (70,000) 980,000 14,420,000  
Fair value 53,900,000 8,190,000 8,260,000 22,680,000  
Recurring [Member] | Level 1 [Member]          
Assets [Abstract]          
Marketable securities held in Trust Account 254,202,898   251,924,993 254,187,706  
Recurring [Member] | Level 1 [Member] | Public Warrants [Member]          
Liabilities [Abstract]          
Warrant liability 88,000,000   5,000,000 41,000,000  
Changes in Fair Value of Warrant Liabilities [Roll Forward]          
Fair value 41,000,000 5,000,000   5,000,000  
Fair value 88,000,000   5,000,000 41,000,000  
Recurring [Member] | Level 3 [Member] | Private Placement Warrants [Member]          
Liabilities [Abstract]          
Warrant liability 53,900,000   8,260,000 22,680,000  
Changes in Fair Value of Warrant Liabilities [Roll Forward]          
Fair value 22,680,000 $ 8,260,000   8,260,000  
Fair value $ 53,900,000   $ 8,260,000 $ 22,680,000