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Stockholders' Equity, Preferred Stock and Common Stock (Q3) (Details) - $ / shares
9 Months Ended 10 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Stockholders' Equity [Abstract]      
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000  
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001  
Preferred stock, shares issued (in shares) 0 0  
Preferred stock, shares outstanding (in shares) 0 0  
Common stock subject to possible redemption (in shares) 23,820,521 23,861,949  
Stock conversion basis at time of business combination 1 1  
Stock conversion percentage threshold 20.00% 20.00%  
Minimum [Member]      
Stockholders' Equity [Abstract]      
Voting percentage of common stock 90.00% 90.00%  
Class A Common Stock [Member]      
Stockholders' Equity [Abstract]      
Common stock, shares authorized (in shares) 200,000,000 200,000,000  
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001  
Common stock, shares issued (in shares) 1,179,479 1,138,051  
Common stock, shares outstanding (in shares) 1,179,479 1,138,051  
Voting right per share One vote One vote  
Common stock subject to possible redemption (in shares) 23,820,521 23,861,949 23,890,787
Class B Common Stock [Member]      
Stockholders' Equity [Abstract]      
Common stock, shares authorized (in shares) 20,000,000 20,000,000  
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001  
Common stock, shares issued (in shares) 6,250,000 6,250,000  
Common stock, shares outstanding (in shares) 6,250,000 6,250,000  
Voting right per share One vote One vote