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v3.24.0.1

Summary of Business and Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) $ / shares | Dec. 31, 2023 USD ($) segment insurance_carrier $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Number of health insurance carriers | insurance_carrier |  | 180 |  |  |
Total stock-based compensation expense |  | $ 23,213,000 | $ 20,316,000 | $ 32,857,000 |
Cost of revenue |  | 1,771,000 | 1,647,000 | 1,992,000 |
(Increase) decrease in net loss |  | $ 28,214,000 | $ 88,722,000 | $ 104,375,000 |
Basic (in dollars per share) | $ / shares |  | $ (2.37) | $ (4.36) | $ (4.59) |
Diluted (in dollars per share) | $ / shares |  | $ (2.37) | $ (4.36) | $ (4.59) |
Number of operating segments | segment |  | 2 |  |  |
Goodwill |  | $ 0 | $ 0 |  |
Advertising expense |  | 148,700,000 | 169,100,000 | $ 240,400,000 |
Research and development expense |  | 13,700,000 | 12,100,000 | 10,400,000 |
Capitalized internal-use software and website development costs |  | 9,700,000 | 17,200,000 | 19,600,000 |
Amortization of internally developed software |  | 17,376,000 | 17,263,000 | 12,901,000 |
Capitalized internal-use software and development costs, net |  | $ 23,600,000 | 31,300,000 |  |
Maximum annual contributions per employee, percentage |  | 85.00% |  |  |
Matching contribution, percent of match |  | 100.00% |  |  |
Maximum matching contribution percentage |  | 3.00% |  |  |
Contribution amount |  | $ 3,600,000 | 3,800,000 | 4,200,000 |
Service-Based Awards | Share-Based Payment Arrangement, Employee |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Vesting term for awards |  | 4 years |  |  |
Service-Based Awards | Share-Based Payment Arrangement, Nonemployee |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Vesting term for awards |  | 1 year |  |  |
Performance And Market-Based Awards |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Vesting term for awards |  | 1 year |  |  |
Common stock options |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | $ 1,254,000 | $ 1,154,000 | 707,000 |
Vesting term for awards |  | 7 years |  |  |
Market-Based Performance Stock Units |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Vesting term for awards |  | 4 years |  |  |
Non-Market Based Performance Stock Units |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Vesting term for awards |  | 1 year |  |  |
Internal-Use Software and Website Development Costs |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Useful life (in years) |  | 3 years |  |  |
Medicare |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Goodwill impairment |  |  |  | $ 40,200,000 |
Medicare | Medicare Advantage | Maximum |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 14 years |  |  |
Medicare | Medicare Advantage | Minimum |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 2 years |  |  |
Medicare | Medicare Advantage | Median |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 3 years |  |  |
Medicare | Medicare Supplement |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 4 years |  |  |
Medicare | Medicare Part D |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 5 years |  |  |
Individual and Family | Maximum |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 2 years |  |  |
Individual and Family | Minimum |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 1 year 6 months |  |  |
Ancillary | Maximum | Short-term |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 6 months |  |  |
Ancillary | Maximum | Other |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 6 years |  |  |
Ancillary | Minimum | Other |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Average plan duration (in years) |  | 1 year |  |  |
Revenue from Contract with Customer | Product Concentration Risk | Medicare |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Concentration risk, percentage |  | 89.00% | 88.00% | 86.00% |
Under-Recognition Of Stock-Based Compensation Expense |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Total stock-based compensation expense |  |  |  |  | $ 3,000,000
Over-Recognition Of Licensing Costs | License |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Cost of revenue |  |  |  |  | $ 1,500,000
Out-Of-Period Adjustments |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
(Increase) decrease in net loss | $ 1,500,000 |  |  | $ 1,500,000 |
Basic (in dollars per share) | $ / shares | $ 0.06 |  |  | $ 0.05 |
Diluted (in dollars per share) | $ / shares | $ 0.06 |  |  | $ 0.05 |

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