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Stockholders' and Members' Equity, Investor Voting Warrants (Q3) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 28, 2016
Sep. 30, 2019
Goldman and Beekman [Member]    
Investor Voting Warrants [Abstract]    
Number of shares issued (in shares)   2,148,806
Investor Voting Warrants [Member]    
Investor Voting Warrants [Abstract]    
Common unit warrants issued (in shares) 25,000  
Common unit warrants in exchange price $ 1.0  
Common unit warrants term (in years) 10 years  
Common units redemption term 5 years  
Warrants exercise price per unit (in dollars per share) $ 0.0001