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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Apr. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($) office	Sep. 30, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction
Payment to acquire equity method investment			$ 3,083	$ 0
Loss from share of equity loss and intangible asset amortization			73
Accounts payable		$ (13,795)	(13,795)			$ (19,105)
Decrease in deferred tax asset		(1,423)	(1,423)			$ (1,516)
Deferred revenue		888	888		$ 825
Deferred revenue, revenue recognized in period		$ 63	$ 648
Majority Shareholder
Related Party Transaction
Percent of outstanding shares held by related party		52.40%	52.40%
Equity Method Investee
Related Party Transaction
Advertising services purchased			$ 164
Minimum
Related Party Transaction
Number of offices | office			25
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Related Party Transaction
Accounts payable					1,600
Decrease in deferred tax asset					270
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Retained Earnings
Related Party Transaction
Cumulative adjustment					$ 1,300
WeekenGO
Related Party Transaction
Payment to acquire equity method investment	$ 3,000
Equity method investment ownership percentage	25.00%
Equity method purchase price allocation, tangible assets	$ 1,000
Goodwill	1,500
Loss from share of equity loss and intangible asset amortization		$ 85
WeekenGO | Equity Method Investee
Related Party Transaction
Insertion order signed to advertise with TravelZoo	2,100
Advertising services purchased		$ 137
WeekenGO | Technology related intangible
Related Party Transaction
Equity method purchase price allocation, intangible assets	$ 485
Intangible assets, useful life (in years)	3 years

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