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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