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Revenue - Commission Revenue by Segment (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Total revenue $ 134,214 $ 106,408
Basic (in dollars per share) $ (0.03) $ 0.14
Diluted (in dollars per share) $ (0.03) $ 0.13
Commission    
Disaggregation of Revenue [Line Items]    
Total revenue $ 127,052 $ 99,669
Commission revenue from members approved during the period    
Disaggregation of Revenue [Line Items]    
Total revenue 121,073 86,921
Net commission revenue adjustments from members approved in prior period    
Disaggregation of Revenue [Line Items]    
Total revenue $ 3,292 $ 10,352
Basic (in dollars per share) $ 0.12 $ 0.42
Diluted (in dollars per share) $ 0.12 $ 0.40
Commission revenue from renewals of small business members during the period    
Disaggregation of Revenue [Line Items]    
Total revenue $ 2,687 $ 2,396
Medicare | Commission    
Disaggregation of Revenue [Line Items]    
Total revenue 114,692 90,104
Medicare | Commission revenue from members approved during the period    
Disaggregation of Revenue [Line Items]    
Total revenue 114,678 81,125
Medicare | Net commission revenue adjustments from members approved in prior period    
Disaggregation of Revenue [Line Items]    
Total revenue 14 8,979
Medicare | Commission revenue from renewals of small business members during the period    
Disaggregation of Revenue [Line Items]    
Total revenue 0 0
Individual, Family and Small Business | Commission    
Disaggregation of Revenue [Line Items]    
Total revenue 12,360 9,565
Individual, Family and Small Business | Commission revenue from members approved during the period    
Disaggregation of Revenue [Line Items]    
Total revenue 6,395 5,796
Individual, Family and Small Business | Net commission revenue adjustments from members approved in prior period    
Disaggregation of Revenue [Line Items]    
Total revenue 3,278 1,373
Decrease in revenue (900)  
Individual, Family and Small Business | Commission revenue from renewals of small business members during the period    
Disaggregation of Revenue [Line Items]    
Total revenue $ 2,687 $ 2,396