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Related Party Transactions - Narrative (Details) - USD ($)				1 Months Ended	12 Months Ended
	Oct. 30, 2017	Sep. 28, 2015	Aug. 20, 2015	Sep. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2014
Related Party Transactions
Repayments of related party debt					$ 0	$ 5,658,000	$ 3,250,000
Employee options granted to purchase shares of common stock (in shares)					400,000	150,000	400,000
Azzurro Capital, Inc.
Related Party Transactions
Percent of outstanding shares					57.80%
Travelzoo Asia Pacific Adjustments | Affiliated Entity
Related Party Transactions
Net liabilities							$ 6,800,000
Loan Issued to Asia Pacific | Majority Shareholder
Related Party Transactions
Related party debt			$ 2,200,000.0					$ 1,000,000	$ 1,000,000.0
Stated percentage (percentage)			10.00%						8.00%
Interest payable								$ 5,000
Repayments of related party debt				$ 3,300,000
Repayments of related party debt, interest				$ 128,000
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
Travelzoo Asia Pacific
Related Party Transactions
Market transaction value			$ 22,600,000				$ 22,600,000
Cash consideration			17,000,000
Business combination, consideration transferred, liabilities incurred			$ 5,700,000
Note term (in years)			3 years

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