Annual report pursuant to Section 13 and 15(d)

Basis of Presentation - Description of Business (Details)

v3.19.3.a.u2
Basis of Presentation - Description of Business (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
item
Sep. 30, 2019
item
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Number of markets have localized versions of the website | item 48   48  
Number of languages for the website | item 28   28  
Number of average monthly unique visitors | item   463    
Liberty Media        
Related Party Transaction, Amounts of Transaction     $ 4.0 $ 3.0
Liberty Media | CEO        
CEO compensation allocation percentage 5.00%      
Employment agreement term 5 years      
Annual base salary $ 3.0      
One-time cash commitment bonus 5.0      
Annual target cash performance bonus 17.0      
Annual equity awards 17.5      
Upfront awards $ 90.0