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v3.21.2

Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands, ¥ in Millions, member in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 16, 2020 USD ($) | Jun. 16, 2020 JPY (¥) | Sep. 30, 2021 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) member | Sep. 30, 2021 JPY (¥) member | 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 |  |  |  |
Ownership percentage held by related party |  |  | 38.90% |  | 38.90% |  |  |  |  |
Deferred revenue |  |  | $ 1,800 |  | $ 1,800 |  | $ 1,300 |  |  |
Deferred revenue recognized |  |  |  |  | 620 |  |  |  |  |
Voucher liability, current |  |  | 18,300 |  | 18,300 |  | 15,200 |  |  |
Customer voucher refund liability |  |  | 3,100 |  | 3,100 |  | 3,900 |  |  |
Merchant payables |  |  | 73,183 |  | 73,183 |  | 57,104 |  |  |
Impairment of identifiable intangible assets |  |  |  | $ 810 |  |  |  |  |  |
Goodwill impairments |  |  |  | 2,100 |  |  |  |  |  |
Negative working capital |  |  | 18,000 |  | 18,000 |  |  |  |  |
Travelzoo North America |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  | 429 |  | 429 |  |  |  |  |
Travelzoo Europe |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  | 1,400 |  | $ 1,400 |  |  |  |  |
Jack’s Flight Club |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Number of members | member |  |  |  |  | 1.7 | 1.7 |  |  |  |
Goodwill impairments |  |  |  | $ 2,110 | $ 2,100 |  |  |  |  |
Weekengo |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  |  |  |  |  |  |  |  |  | 33.70%
Proceeds from sale of equity method investments |  |  |  |  | 213 |  |  |  |  |
Realized gain (loss) on disposal |  |  |  |  |  |  | 468 |  |  |
Letters of credit outstanding, amount |  |  | 200 |  | 200 |  |  |  |  |
Finite-lived intangible assets, remaining amortization period |  |  |  |  |  |  |  |  | 5 years |
Amount of debt forgiven |  |  |  |  |  |  | 822 |  |  |
WeekenGO | Equity Method Investee |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Advertising services purchased |  |  |  |  |  |  | $ 384 | $ 1,200 |  |
Travelzoo Japan |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Royalty recognized |  |  | 0 |  | 9 |  |  |  |  |
Travelzoo Singapore |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Royalty recognized |  |  | $ 2 |  | 2 |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Travelzoo Japan |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Term | 3 years | 3 years |  |  |  |  |  |  |  |
Interest free loan amount | $ 430 | ¥ 46.0 |  |  | 430 | ¥ 46.0 |  |  |  |
Travelzoo Japan | Royalty Agreement Terms |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Term | 5 years | 5 years |  |  |  |  |  |  |  |
Trivago | Weekengo |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  | $ 2,900 |  |  |  |  |

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