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RELATED PARTY TRANSACTIONS, Founder Shares (Q3) (Details)
1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Sep. 26, 2019
shares
Jun. 30, 2019
USD ($)
shares
Sep. 30, 2019
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Sep. 30, 2020
$ / shares
shares
Related Party Transactions [Abstract]          
Proceeds from issuance of common stock to Sponsor | $       $ 245,000,000  
Number of trading days       20 days 20 days
Trading day threshold period       30 days 30 days
Class A Ordinary Shares [Member]          
Related Party Transactions [Abstract]          
Number of shares outstanding (in shares)       1,259,819 1,331,545
Share price threshold to transfer, assign or sell shares (in dollars per share) | $ / shares       $ 18.00 $ 18.00
Class A Ordinary Shares [Member] | Minimum [Member]          
Related Party Transactions [Abstract]          
Share price threshold to transfer, assign or sell shares (in dollars per share) | $ / shares       $ 12.00 $ 12.00
Threshold period after initial business combination       150 days 150 days
Class B Ordinary Shares [Member]          
Related Party Transactions [Abstract]          
Forfeiture of ordinary shares (in shares)     937,500 937,500  
Number of shares outstanding (in shares)       6,250,000 6,250,000
Sponsor [Member] | Class A Ordinary Shares [Member]          
Related Party Transactions [Abstract]          
Number of trading days       20 days 20 days
Trading day threshold period       30 days 30 days
Sponsor [Member] | Class B Ordinary Shares [Member]          
Related Party Transactions [Abstract]          
Shares issued (in shares)   7,187,500      
Proceeds from issuance of common stock to Sponsor | $   $ 25,000      
Stock conversion ratio   1      
Percentage of shares held by Founder after Initial Public Offering   20.00%   20.00%  
Forfeiture of ordinary shares (in shares) 937,500        
Number of shares outstanding (in shares)       6,250,000 6,250,000
Sponsor [Member] | Class B Ordinary Shares [Member] | Maximum [Member]          
Related Party Transactions [Abstract]          
Number of shares subject to forfeiture (in shares)     937,500 937,500