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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands, member in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 24, 2020 | Jun. 16, 2020 USD ($) | Jun. 16, 2020 JPY (¥) | Jun. 16, 2020 SGD ($) | Jan. 13, 2020 USD ($) | Feb. 29, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) | Mar. 31, 2021 USD ($) member | Mar. 31, 2021 JPY (¥) member | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2005 | Dec. 23, 2020
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of members | member |  |  |  |  |  |  |  |  | 30.0 | 30.0 |  |  |  |  |  |
Payment to acquire equity method investment |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 679 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 10,944 |  | $ 10,944 |  | $ 10,944 |  |  |
Ownership percentage held by related party |  |  |  |  |  |  |  |  | 39.40% |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  | $ 2,400 |  | 1,300 |  | 1,300 |  |  |
Deferred revenue recognized |  |  |  |  |  |  |  |  | 223 |  |  |  |  |  |  |
Voucher liability, current |  |  |  |  |  |  |  |  | 18,600 |  | 15,200 |  | 15,200 |  |  |
Customer voucher refund liability |  |  |  |  |  |  |  |  | 4,000 |  | 3,900 |  | 3,900 |  |  |
Merchant payable |  |  |  |  |  |  |  |  | 70,094 |  | 57,104 |  | 57,104 |  |  |
Impairment of identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  | 810 |  |  |  |
Goodwill impairments |  |  |  |  |  |  |  |  |  |  |  | 2,100 |  |  |  |
Negative working capital |  |  |  |  |  |  |  |  | 17,000 |  |  |  |  |  |  |
Travelzoo North America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  | 782 |  |  |  |  |  |  |
Travelzoo Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  |  | $ 1,600 |  |  |  |  |  |  |
Jack’s Flight Club |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of members | member |  |  |  |  |  |  |  |  | 1.6 | 1.6 |  |  |  |  |  |
Percentage of ownership before transaction (up to) |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 13,054 |  |  |  |  |  |  | 10,944 |  | $ 0 |  |
Goodwill impairments |  |  |  |  |  |  |  |  | $ 2,100 |  |  | $ 2,110 |  |  |  |
Weekengo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  |  | 33.70% | 26.60% | 25.00% |  |  |  |  |  |  |  | 33.70%
Payment to acquire equity method investment |  |  |  |  |  | $ 1,700 | $ 673 | $ 3,000 | 1,800 |  |  |  |  |  |  |
Equity method purchase price allocation, tangible assets |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |
Loss from share of equity loss and intangible asset amortization |  |  |  |  |  |  |  |  |  |  |  |  | 384 | 882 |  |
Goodwill |  |  |  |  |  |  |  |  | 1,500 |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  |  |  | 213 |  |  |  |  |  |  |
Realized gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  |  |  | 468 |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  | 200 |  |  |  |  |  |  |
Finite-lived intangible assets, remaining amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Amount of debt forgiven |  |  |  |  |  |  |  |  | 822 |  |  |  |  |  |  |
Weekengo | Technology related intangible |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method purchase price allocation, intangible assets |  |  |  |  |  |  |  |  | $ 485 |  |  |  |  |  |  |
Intangible assets, useful life |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |  |  |  |
Weekengo, Original Investment Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire equity method investment |  |  |  |  |  |  |  |  | $ 2,100 |  |  |  |  |  |  |
WeekenGO | Equity Method Investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising services purchased |  |  |  |  |  |  |  |  |  |  |  |  | $ 384 | $ 1,200 |  |
Discontinued Operations, Disposed of by Sale | Travelzoo Japan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term |  | 3 years | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Interest free loan amount |  | $ 430 | ¥ 46,000,000.0 |  |  |  |  |  | 430 | ¥ 46,000,000 |  |  |  |  |  |
Proceeds from divestiture of businesses | ¥ |  |  | ¥ 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Travelzoo Japan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership before transaction (up to) |  | 100.00% | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax loss |  | $ 128 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty recognized |  |  |  |  |  |  |  |  | $ 9 |  | $ 9 |  |  |  |  |
Proceeds from divestiture of businesses | ¥ |  |  | ¥ 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Travelzoo Japan | Royalty Agreement Terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term |  | 5 years | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Travelzoo Japan | Loan Issued to Travelzoo Japan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |  |  |  |
Travelzoo Singapore |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership before transaction (up to) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |
Travelzoo Singapore | Royalty Agreement Terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trivago | Weekengo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  |  |  | $ 2,900 |  |  |  |  |  |  |

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