Summary of Significant Accounting Policies - Narrative (Details) shares in Millions		1 Months Ended				3 Months Ended	12 Months Ended
	Dec. 28, 2022 shares	Oct. 31, 2023 USD ($)	May 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Jan. 31, 2022 USD ($)	Mar. 31, 2024 USD ($) member supplier shares	Dec. 31, 2023 USD ($)	Jan. 01, 2024 USD ($)	Dec. 31, 2022
Related Party Transaction
Number of members | member						30,000,000
Number of travel supplier partnerships | supplier						5,000
Annual membership fee charged								$ 40
Deferred revenue						$ 3,200,000
Voucher liability, current						4,500,000	$ 5,200,000
Customer voucher refund liability						212,000	268,000
Merchant payables						17,827,000	20,622,000
Goodwill impairments		$ 0				$ 0
Private Placement
Related Party Transaction
Number of shares sold | shares	3.4					1.9
Jack’s Flight Club
Related Party Transaction
Deferred revenue						$ 2,200,000	1,500,000
Deferred revenue recognized							769,000
Travelzoo North America And Travelzoo Europe
Related Party Transaction
Deferred revenue						998,000	$ 569,000
Deferred revenue recognized						$ 441,000
Board of Directors Chairman
Related Party Transaction
Ownership percentage held by related party						39.60%			50.30%
Holger Bartel
Related Party Transaction
Ownership percentage held by related party						3.90%
Government Assistance, CARES Act
Related Party Transaction
Proceeds from government funding			$ 205,000	$ 494,000	$ 1,200,000
Travelzoo Japan | Royalty Agreement Terms
Related Party Transaction
Term						5 years