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STOCKHOLDERS' EQUITY, Preferred Stock and Common Stock (FY) (Details)
3 Months Ended 6 Months Ended
Sep. 14, 2020
Mar. 31, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Stockholders' Equity [Abstract]      
Preferred stock, shares authorized (in shares)   1,000,000 1,000,000
Preferred stock, par value (in dollars per share) | $ / shares   $ 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)   19,623,614 19,471,900
Stock conversion basis at time of business combination 1 1 1
Stock conversion percentage threshold   20.00% 20.00%
Class A Common Stock [Member]      
Stockholders' Equity [Abstract]      
Common stock, shares authorized (in shares)   100,000,000 100,000,000
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001 $ 0.0001
Common stock, shares issued (in shares)   3,376,386 3,528,100
Common stock, shares outstanding (in shares)   3,376,386 3,528,100
Voting right per share   One vote One vote
Class B Common Stock [Member]      
Stockholders' Equity [Abstract]      
Common stock, shares authorized (in shares)   10,000,000 10,000,000
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001 $ 0.0001
Common stock, shares issued (in shares)   5,750,000 5,750,000
Common stock, shares outstanding (in shares)   5,750,000 5,750,000
Voting right per share   One vote One vote