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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% |

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