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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2004
Dec. 31, 2002
Loss Contingencies        
Operating leases, rent expense $ 4,200 $ 4,900    
Sublease income 345 $ 347    
Purchase obligation $ 46      
Minimum        
Loss Contingencies        
Remaining lease term 1 year      
Maximum        
Loss Contingencies        
Remaining lease term 10 years      
Travel Zoo Com Corporation        
Loss Contingencies        
Period for receiving shares under merger (in years)     2 years 2 years
Number of shares exchanged under merger       1