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Summary of Significant Accounting Policies - Narrative (Details)
member in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 24, 2020
Jun. 16, 2020
USD ($)
Jun. 16, 2020
JPY (¥)
Jan. 13, 2020
USD ($)
Feb. 29, 2020
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
member
Dec. 31, 2019
USD ($)
Dec. 31, 2005
Dec. 23, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Number of members | member                 30.0      
Payments to acquire equity method investments                 $ 679,000 $ 0    
Goodwill                 10,944,000 0    
Proceeds from sale of equity investment in WeGo                 2,607,000 0    
Deferred revenue                 2,700,000 786,000    
Deferred revenue, revenue recognized in period                   364,000    
Voucher liability, current                 15,200,000      
Refund liability                 3,900,000      
Merchant payables                 57,104,000 12,967,000    
Impairment of intangible assets, finite-lived               $ 810,000        
Goodwill impairments               $ 2,100,000        
Advertising costs                 2,600,000 8,800,000    
Marketing and advertising expense                 314,000      
Total foreign currency transaction gain (loss)                 685,000 (80,000)    
Working capital                 12,800,000      
Impairment of software                 0 0    
Travelzoo North America                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Deferred revenue                 1,300,000      
Travelzoo Europe                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Deferred revenue                 $ 1,400,000      
Computer hardware and software | Minimum                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Estimated useful lives (in years)                 3 years      
Computer hardware and software | Maximum                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Estimated useful lives (in years)                 5 years      
Capitalized internal-use software and website development | Minimum                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Estimated useful lives (in years)                 3 years      
Capitalized internal-use software and website development | Maximum                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Estimated useful lives (in years)                 5 years      
Office equipment and office furniture | Minimum                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Estimated useful lives (in years)                 3 years      
Office equipment and office furniture | Maximum                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Estimated useful lives (in years)                 5 years      
Other Income (Loss)                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Total foreign currency transaction gain (loss)                 $ (416,000) 5,000    
Azzurro Capital, Inc.                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Percent of outstanding shares                 40.00%      
Jack's Flight Club                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Number of members | member                 1.7      
Percentage of ownership before transaction (up to)       100.00%                
Goodwill       $ 13,054,000         $ 10,944,000 0    
Goodwill impairments                 2,110,000      
Weekengo                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Payments to acquire equity method investments         $ 1,700,000 $ 673,000 $ 3,000,000.0   1,800,000      
Ownership percentage           26.60% 25.00%         33.70%
Equity method investment, related identifiable tangible assets                 1,000,000.0      
Goodwill                 1,500,000      
Loss from share of equity loss and intangible asset amortization                 384,000 882,000    
Proceeds from sale of equity investment in WeGo                 213,000      
Other income (loss)                 468,000      
Remaining amount                 200,000      
Amortization period, domain name and trademark                     5 years  
Amount of debt forgiven                 822,000      
Weekengo | Technology-Based Intangible Assets                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Equity method investment, related identifiable intangible assets                 $ 485,000      
Estimated Life (Years)                 3 years      
Weekengo, Original Investment Agreement                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Payments to acquire equity method investments                 $ 2,100,000      
WeekenGO | Equity Method Investee                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Purchases from related party                 384,000 $ 1,200,000    
Discontinued Operations, Disposed of by Sale | Travelzoo Japan                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Term   3 years 3 years                  
Interest free loan amount   $ 430,000 ¥ 46,000,000.0                  
Travelzoo Japan                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Percentage of ownership before transaction (up to)   100.00% 100.00%                  
Proceeds from divestiture of businesses | ¥     ¥ 1                  
Available-for-sale, realized Loss   $ 128,000                    
Travelzoo Japan | Royalty Agreement Terms                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Term   5 years 5 years                  
Travelzoo Japan | Loan Issued To Travelzoo Japan                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Term   3 years 3 years                  
Travelzoo Singapore                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Percentage of ownership before transaction (up to) 100.00%                      
Trivago | Weekengo                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Proceeds from sale of equity investment in WeGo                 $ 2,900,000