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