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Basis of Presentation and Summary of Significant Accounting Policies - Concentration Risk (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue Benchmark | Customer Concentration Risk | Largest Licensee        
Concentration Risk [Line Items]        
Concentration risk, percentage 11.00% 16.00% 12.00% 16.00%