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Summary of Significant Accounting Policies - Concentrations (Details) - customer
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2021
Revenue | Customer A          
Number of customers 0 0 0 0  
Revenue | Customer Concentration Risk | Minimum | Customer A          
Concentration percentage 10.00% 10.00% 10.00% 10.00%  
Accounts receivable | Customer Concentration Risk | Customer A          
Concentration percentage         14.00%
Content costs from vendors | Supplier Concentration | Vendor A          
Concentration percentage 21.00% 18.00% 20.00% 18.00%  
Content costs from vendors | Supplier Concentration | Vendor B          
Concentration percentage 14.00% 13.00% 13.00% 13.00%