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Revenues - Schedule of Reconciliation of Contract Liabilities with Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning $ 234 $ 354
Consideration Received 974 1,070
Recognized in Revenue (1,112) (1,190)
Contract liabilities with customers ending 96 234
Ad revenue    
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning 82 84
Consideration Received 451 611
Recognized in Revenue (484) (613)
Contract liabilities with customers ending 49 82
Expo revenue    
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning 8 151
Consideration Received 574 426
Recognized in Revenue (581) (569)
Contract liabilities with customers ending 1 8
Other    
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning 144 119
Consideration Received (51) 33
Recognized in Revenue (47) (8)
Contract liabilities with customers ending $ 46 $ 144