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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 |  |  |

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