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Revenue - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in Accounting Estimate [Line Items]      
Total revenue $ 452,871 $ 405,356 $ 538,199
Net commission revenue from members approved in prior periods      
Change in Accounting Estimate [Line Items]      
Total revenue 48,075 6,401 21,739
Medicare Segment | Net commission revenue from members approved in prior periods      
Change in Accounting Estimate [Line Items]      
Total revenue 33,544 (2,326) (8,414)
E&I Segment | Net commission revenue from members approved in prior periods      
Change in Accounting Estimate [Line Items]      
Total revenue $ 14,531 $ 8,727 $ 30,153