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Leases - Schedule of Lease Expense (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Leases [Abstract]        
Operating lease expense - fixed payments $ 838   $ 1,680  
Variable lease expense 65   130  
Short-term equipment and other lease expense (includes $146 recorded in advertising and marketing, and $125 recorded in repairs and maintenance; see Note 4) 365   759  
Sublease income (4)   (6)  
Total lease expense, net 1,264 $ 957,000 2,563 $ 2,000,000
Operating cash outflows from operating leases $ 1,207   $ 2,462  
Weighted average remaining lease term 13 years   13 years  
Weighted average discount rate 6.10%   6.10%