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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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