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Commitments and Contingencies (Details) - USD ($)
 1 Months Ended 12 Months Ended
Aug. 03, 2018
Dec. 31, 2004
Dec. 31, 2002
Jun. 30, 2018
Dec. 31, 2017
Operating leases          
2018 Remaining       $ 3,171,000  
2019       5,613,000  
2020       4,021,000  
2021       3,194,000  
2022       2,364,000  
Thereafter       3,250,000  
Total       21,613,000  
Purchase obligations          
2018 Remaining       849,000  
2019       95,000  
2020       12,000  
2021       0  
2022       0  
Thereafter       0  
Total       956,000  
Total commitments          
Total commitments 2018 Remaining       4,020,000  
Total commitments in 2019       5,708,000  
Total commitments in 2020       4,033,000  
Total commitments in 2021       3,194,000  
Total commitments in 2022       2,364,000  
Total commitments Thereafter       3,250,000  
Total commitments       22,569,000  
Local deals and getaway merchant payables       $ 8,800,000 $ 14,600,000
Travel Zoo Com Corporation          
Loss Contingencies          
Period for receiving shares under merger (in years)   2 years 2 years    
Number of shares exchanged under merger (in shares)     1    
Subsequent Event          
Total commitments          
Decrease to future minimum payment in remainder of year from termination of lease $ 130,000        
Decrease to future minimum payment in 2019 from termination of lease 548,000        
Decrease to future minimum payment in 2020 from termination of lease $ 91,000