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Revenues - Schedule of Reconciliation of Contract Liabilities with Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning $ 354 $ 336
Consideration Received 1,070 1,080
Recognized in Revenue (1,190) (1,062)
Contract liabilities with customers ending 234 354
Ad revenue    
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning 84 92
Consideration Received 611 593
Recognized in Revenue (613) (601)
Contract liabilities with customers ending 82 84
Expo revenue    
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning 151 211
Consideration Received 426 393
Recognized in Revenue (569) (453)
Contract liabilities with customers ending 8 151
Other    
Contract With Customer Liability [Roll Forward]    
Contract liabilities with customers beginning 119 33
Consideration Received 33 94
Recognized in Revenue (8) (8)
Contract liabilities with customers ending $ 144 $ 119