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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

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