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Summary of Business and Significant Accounting Policies - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
state
insurance_carrier
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Number of health insurance carriers (more than) | insurance_carrier 200    
Number of states in which the Company is licensed to market and sell health insurance | state 50    
Total stock-based compensation expense $ 11,402 $ 8,714  
Cost of revenue 996 1,138  
Decrease in net income (loss) 800 $ (3,452)  
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]      
Decrease in net income (loss) $ 1,500    
License | Over-Recognition Of Licensing Costs      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Cost of revenue     $ 1,500