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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2020
USD ($)
Program
Segment
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Accounting Policies [Line Items]        
Number of programs | Program   4    
Increase to deferred revenue $ 3,200 $ 686 $ (1,198)  
Decrease to retained earnings $ 3,200      
Allowance for doubtful accounts   0 0  
Unbilled receivables   5,700 29,100  
Depreciation expense   $ 9,930 $ 7,137 $ 4,667
Common stock shares | shares   48,983,735 48,156,786  
Carrying value of adjustable convertible equity right   $ 10,800    
Number of reporting units | Segment   1    
Accrued liabilities   $ 18,424 $ 37,640  
Continuing Operations        
Accounting Policies [Line Items]        
Number of programs | Program   3    
Increase to deferred revenue   $ 3,800    
Number of reporting units | Segment   1    
Media expense   $ 7,200 7,100 1,000
Prepaid for future advertisements and promotions   $ 0 1,700  
Healthcare        
Accounting Policies [Line Items]        
Intangible assets not subject to amortization     29,000 $ 29,000
Number of reporting units | Segment   1    
Other Assets        
Accounting Policies [Line Items]        
Common stock shares | shares   159,309    
Network Locations Visits        
Accounting Policies [Line Items]        
Accrued liabilities   $ 10,500 $ 28,800  
Minimum        
Accounting Policies [Line Items]        
Remaining lease terms   1 month    
Estimated useful life   3 years 3 years  
Maximum        
Accounting Policies [Line Items]        
Remaining lease terms   45 months    
Estimated useful life   10 years 10 years  
Computer Software and Hardware | Minimum        
Accounting Policies [Line Items]        
Useful life   3 years    
Computer Software and Hardware | Maximum        
Accounting Policies [Line Items]        
Useful life   7 years    
Furniture and Office Equipment | Minimum        
Accounting Policies [Line Items]        
Useful life   4 years    
Furniture and Office Equipment | Maximum        
Accounting Policies [Line Items]        
Useful life   7 years    
Equipment | Minimum        
Accounting Policies [Line Items]        
Useful life   3 years    
Equipment | Maximum        
Accounting Policies [Line Items]        
Useful life   5 years    
Leasehold Improvements | Minimum        
Accounting Policies [Line Items]        
Useful life   2 years    
Leasehold Improvements | Maximum        
Accounting Policies [Line Items]        
Useful life   15 years