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Revenue - Commission Revenue by Segment (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 452,871 | $ 405,356 | $ 538,199
Basic (in dollars per share) | $ (2.37) | $ (4.36) | $ (4.59)
Diluted (in dollars per share) | $ (2.37) | $ (4.36) | $ (4.59)
Commission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 403,924 | $ 361,246 | $ 493,119
Commission revenue from members approved during the period |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 345,876 | 344,864 | 462,816
Net commission revenue from members approved in prior periods |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 48,075 | $ 6,401 | $ 21,739
Basic (in dollars per share) | $ 1.72 | $ 0.23 | $ 0.81
Diluted (in dollars per share) | $ 1.72 | $ 0.23 | $ 0.81
Commission revenue from renewals of small business members during the period |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 9,973 | $ 9,981 |
Medicare Segment | Commission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 359,631 | 320,180 | $ 429,324
Medicare Segment | Commission revenue from members approved during the period |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 326,087 | 322,506 | 437,738
Medicare Segment | Net commission revenue from members approved in prior periods |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 33,544 | (2,326) | (8,414)
Decrease in revenue | 4,300 | 16,500 | 28,800
Medicare Segment | Commission revenue from renewals of small business members during the period |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 |
Employer and Individual | Commission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 44,293 | 41,066 | 63,795
Employer and Individual | Commission revenue from members approved during the period |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 19,789 | 22,358 | 25,078
Employer and Individual | Net commission revenue from members approved in prior periods |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 14,531 | 8,727 | 30,153
Employer and Individual | Commission revenue from renewals of small business members during the period |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 9,973 | $ 9,981 | $ 8,564

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