Revenues - Schedule of Reconciliation of Contract Liabilities with Customers (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2022 USD ($)
Contract With Customer Liability [Roll Forward]
Contract liabilities with customers, beginning	$ 354
Consideration Received	637
Recognized in Revenue	(350)
Contract liabilities with customers, ending	641
Ad revenue
Contract With Customer Liability [Roll Forward]
Contract liabilities with customers, beginning	84
Consideration Received	450
Recognized in Revenue	(330)
Contract liabilities with customers, ending	204
Expo revenue
Contract With Customer Liability [Roll Forward]
Contract liabilities with customers, beginning	151
Consideration Received	178
Recognized in Revenue	0
Contract liabilities with customers, ending	329
Other
Contract With Customer Liability [Roll Forward]
Contract liabilities with customers, beginning	119
Consideration Received	9
Recognized in Revenue	(20)
Contract liabilities with customers, ending	$ 108