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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2004
Dec. 31, 2002
Mar. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Local deals and getaway merchant payables     $ 6.1 $ 13.0
Travel Zoo Com Corporation        
Business Acquisition [Line Items]        
Period for receiving shares under merger (in years) 2 years 2 years    
Number of shares exchanged under merger (in shares)   1