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Related Party Transactions, Founder Shares (FY) (Details)
1 Months Ended 7 Months Ended 9 Months Ended 10 Months Ended
Jun. 19, 2019
shares
Apr. 30, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Aug. 05, 2019
shares
Founder Shares [Abstract]            
Proceeds from issuance of Class B common stock to Sponsor | $     $ 25,000 $ 0 $ 25,000  
Stock conversion basis at time of business combination       1 1  
Number of trading days       20 days 20 days  
Trading day threshold period       30 days 30 days  
Class A Common Stock [Member]            
Founder Shares [Abstract]            
Share price (in dollars per share) | $ / shares       $ 18.00 $ 18.00  
Class B Common Stock [Member]            
Founder Shares [Abstract]            
Number of shares forfeited (in shares)           218,750
Number of shares outstanding (in shares)           6,250,000
Sponsor [Member] | Class A Common Stock [Member]            
Founder Shares [Abstract]            
Stock conversion basis at time of business combination       1 1  
Number of trading days       20 days 20 days  
Trading day threshold period       30 days 30 days  
Sponsor [Member] | Class A Common Stock [Member] | Minimum [Member]            
Founder Shares [Abstract]            
Share price (in dollars per share) | $ / shares       $ 12.00 $ 12.00  
Threshold period after initial Business Combination       150 days 150 days  
Sponsor [Member] | Class B Common Stock [Member]            
Founder Shares [Abstract]            
Shares issued (in shares)   5,750,000        
Proceeds from issuance of Class B common stock to Sponsor | $   $ 25,000        
Stock split ratio 1.125          
Number of shares held (in shares) 6,468,750          
Ownership interest, as converted percentage 20.00%          
Number of shares forfeited (in shares)           218,750
Number of shares outstanding (in shares) 6,468,750         6,250,000
Sponsor [Member] | Class B Common Stock [Member] | Maximum [Member]            
Founder Shares [Abstract]            
Number of shares subject to forfeiture (in shares) 218,750