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Related Party Transactions - Narrative (Details) - USD ($)			12 Months Ended
	Oct. 30, 2017	Sep. 28, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 13, 2019	Dec. 31, 2015	Aug. 20, 2015
Related Party Transactions
Employee options granted to purchase shares of common stock (in shares)			250,000	400,000	150,000
Azzurro Capital, Inc.
Related Party Transactions
Percent of outstanding shares			50.50%
Travelzoo Europe Promissory Note | Majority Shareholder
Related Party Transactions
Related party debt								$ 5,700,000.0
Stated percentage (percentage)								7.00%
Interest payable							$ 267,000
Stock Options Granted | Chief Executive Officer
Related Party Transactions
Employee options granted to purchase shares of common stock (in shares)	400,000	400,000
Subsequent Event | February 2019 Plan
Related Party Transactions
Stock repurchased program authorized number of shares (in shares)						100,000
Aggregate purchase price						$ 1,500,000.0
Stock repurchase program discount on purchase price						5.00%

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