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Summary of Significant Accounting Policies - Narrative (Details)	1 Months Ended		3 Months Ended
	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Mar. 31, 2019 USD ($) office	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction
Operating lease right-of-use assets			$ 14,264,000
Operating lease liability			16,759,000
Deferred revenue					$ 1,300,000
Deferred revenue recognized			$ 930,000
Majority Shareholder
Related Party Transaction
Percent of outstanding shares held by related party			50.10%
Minimum
Related Party Transaction
Number of offices | office			25
Accounting Standards Update 2016-02
Related Party Transaction
Operating lease right-of-use assets				$ 13,400,000
Operating lease liability				16,000,000
Reclassification of deferred rent liability to operating lease right of use asset				$ 2,600,000
WeekenGO
Related Party Transaction
Payment to acquire equity method investment		$ 3,000,000
Equity method investment ownership percentage		25.00%
Equity method purchase price allocation, tangible assets		$ 1,000,000
Goodwill		1,500,000
Loss from share of equity loss and intangible asset amortization			$ 210,000
WeekenGO | Equity Method Investee
Related Party Transaction
Insertion order signed to advertise with TravelZoo		2,100,000
Advertising services purchased			$ 555,000
WeekenGO | Technology related intangible
Related Party Transaction
Equity method purchase price allocation, intangible assets		$ 485,000
Intangible assets, useful life (in years)		3 years
Subsequent Event | WeekenGO
Related Party Transaction
Payment to acquire equity method investment	$ 673,000
Equity method investment ownership percentage	26.60%

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