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Commitments and Contingencies (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2004
Dec. 31, 2002
Dec. 31, 2016
Loss Contingencies              
Charge in general and administrative expenses $ 0 $ 0 $ 0 $ 1,000      
Operating Leases, Future Minimum Payments Receivable [Abstract]              
2017 Remaining 1,542,000   1,542,000        
2018 5,240,000   5,240,000        
2019 4,494,000   4,494,000        
2020 3,825,000   3,825,000        
2021 3,198,000   3,198,000        
Thereafter 5,626,000   5,626,000        
Total 23,925,000   23,925,000        
Purchase Obligation, Fiscal Year Maturity [Abstract]              
2017 Remaining 408,000   408,000        
2018 579,000   579,000        
2019 260,000   260,000        
2020 11,000   11,000        
2021 0   0        
Thereafter 0   0        
Total 1,258,000   1,258,000        
Contractual Obligation, Fiscal Year Maturity [Abstract]              
2017 Remaining 1,950,000   1,950,000        
Total Commitments, Due in 2018 5,819,000   5,819,000        
Total Commitments, Due in 2019 4,754,000   4,754,000        
Total Commitments, Due in 2020 3,836,000   3,836,000        
Total Commitments, Due in 2021 3,198,000   3,198,000        
Total Commitments, Due Thereafter 5,626,000   5,626,000        
Total commitments 25,183,000   25,183,000        
Local deals and getaway merchant payables $ 11,000,000   $ 11,000,000       $ 14,800,000
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