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Summary of Business and Significant Accounting Policies - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
insurance_carrier
state
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
insurance_carrier
state
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Number of health insurance carriers (more than) | insurance_carrier 200     200    
Number of states in which the Company is licensed to market and sell health insurance | state 50     50    
Total stock-based compensation expense $ 5,234   $ 6,332 $ 24,881 $ 21,722  
Cost of revenue (25)   482 1,217 2,160  
Change in net income (loss) $ 53,014   $ 14,505 $ 72,223 $ 14,423  
Basic (in dollars per share) | $ / shares $ (2.24)   $ (0.55) $ (3.13) $ (0.56)  
Diluted (in dollars per share) | $ / shares $ (2.24)   $ (0.55) $ (3.13) $ (0.56)  
Under-Recognition Of Stock-Based Compensation Expense            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Total stock-based compensation expense           $ 3,000
Out-Of-Period Adjustments            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Change in net income (loss)   $ 1,500   $ 1,500    
Basic (in dollars per share) | $ / shares   $ 0.06   $ 0.06    
Diluted (in dollars per share) | $ / shares   $ 0.06   $ 0.06    
License | Over-Recognition Of Licensing Costs            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Cost of revenue           $ 1,500