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Basis of Presentation and Summary of Significant Accounting Policies - Revenue from Significant Partners (Details) - Customer Concentration Risk - Revenue
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Partner A      
Revenue, Major Customer      
Total revenues (as a percent) 41.00% 45.00%  
Partner B      
Revenue, Major Customer      
Total revenues (as a percent) 14.00% 17.00% 27.00%
Partner C      
Revenue, Major Customer      
Total revenues (as a percent)     13.00%