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Stockholders' / Members' Equity and Redeemable Class A Units (Details)
12 Months Ended
Jun. 25, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2020
vote
$ / shares
shares
Feb. 13, 2020
shares
Sep. 30, 2019
$ / shares
shares
Class of Stock [Line Items]          
Preferred Stock authorized (shares) 10,000,000   10,000,000   10,000,000
Preferred Stock, par value (in USD per share) | $ / shares $ 0.0001   $ 0.0001   $ 0.0001
Common Stock, number of votes per share | vote     1    
Mezzanine Warrants          
Class of Stock [Line Items]          
Warrants outstanding (shares)   1,423,688      
Unsecured Debt | Junior Subordinated Notes          
Class of Stock [Line Items]          
Warrants outstanding (shares)   1,433,920      
Intrinsic value of warrants | $   $ 0      
Warrant exercise price (in USD per share) | $ / shares   $ 2.095      
IPO          
Class of Stock [Line Items]          
Shares issued (shares) 7,647,500        
Class A Common Stock          
Class of Stock [Line Items]          
Common Stock authorized (shares) 150,000,000   150,000,000   150,000,000
Common Stock, par value (in USD per share) | $ / shares $ 0.0001   $ 0.0001   $ 0.0001
Conversion ratio     1    
Conversion ratio, number of shares used to value cash payment (in shares)     1    
Units issued (shares)   13,892,129      
Units outstanding (shares)   13,892,129      
Cumulative preferred return | $ $ 7,627,000 $ 5,105,000      
Distributions to unit holders | $   $ 625,000      
Common Stock issued (shares)     18,864,143   14,444,115
Common Stock, outstanding (shares)     18,864,143   14,444,115
Warrants outstanding (shares)       3,376,391  
Warrant exercise price (in USD per share) | $ / shares     $ 62.88    
Class B Common Stock          
Class of Stock [Line Items]          
Common Stock authorized (shares) 40,000,000   40,000,000   40,000,000
Common Stock, par value (in USD per share) | $ / shares $ 0.0001   $ 0.0001   $ 0.0001
Conversion ratio     1    
Common Stock issued (shares)     11,900,621   12,921,637
Common Stock, outstanding (shares)     11,900,621   12,921,637
Redeemable Class A Units          
Class of Stock [Line Items]          
Units issued (shares)   4,900,000      
Units outstanding (shares)   4,900,000      
Annual preferred return rate (percent)   10.00%      
Cumulative preferred return | $ $ 3,376,000 $ 2,823,000      
Distributions to unit holders | $   $ 131,000      
Common Stock          
Class of Stock [Line Items]          
Common Stock issued (shares)   1,548,722      
Common Stock, outstanding (shares)   1,548,722      
Restricted Class P Units          
Class of Stock [Line Items]          
Common Stock issued (shares)   7,647,350      
Common Stock, outstanding (shares)   7,647,350