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Acquisition - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jan. 22, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
 [1]
Dec. 31, 2016
 [1]
Business Acquisition [Line Items]          
Change in fair value of earnout liability     $ 12,300 $ 0 [2] $ 0 [2]
Acquisition costs     76 $ 621 $ 0
GoMedigap          
Business Acquisition [Line Items]          
Cash paid $ 15,000        
Cash and cash equivalents $ 71        
Shares acquired (in shares) 294,637        
Earnout consideration $ 20,000        
Earnout consideration (in shares) 589,275        
Goodwill deductible period 15 years        
Revenue since acquisition     $ 15,200    
Minimum | Trade names, trademarks and website addresses | GoMedigap          
Business Acquisition [Line Items]          
Weighted-average remaining useful life   3 years      
Maximum | Trade names, trademarks and website addresses | GoMedigap          
Business Acquisition [Line Items]          
Weighted-average remaining useful life     10 years    
[1] As adjusted for the adoption of ASC 606 using the full retrospective method.
[2] As adjusted for the adoption of ASC 606 using the full retrospective method.