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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands, member in Millions								1 Months Ended			3 Months Ended			9 Months Ended
	Aug. 24, 2020	Jun. 16, 2020 USD ($)	Jun. 16, 2020 JPY (¥)	Jun. 16, 2020 SGD ($)	May 05, 2020 USD ($)	Apr. 24, 2020 USD ($)	Jan. 13, 2020 USD ($)	Feb. 29, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) member	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction
Number of members | member														30.0
Goodwill											$ 10,944			$ 10,944		$ 0
Payment to acquire equity method investment														679	$ 0
Interest expense											$ 9			$ 16
Ownership percentage held by related party											39.50%			39.50%
Impairment of identifiable intangible assets												$ 810
Goodwill impairments												$ 2,100
Negative working capital											$ 13,700			$ 13,700
Voucher liability, current											2,300			2,300
Deferred revenue																786
Deferred revenue recognized											$ 17			$ 344
Including Holger Proxy
Related Party Transaction
Ownership percentage held by related party											39.90%			39.90%
Jack’s Flight Club
Related Party Transaction
Number of members | member														1.7
Percentage of ownership before transaction (up to)							100.00%
Goodwill							$ 13,054				$ 10,944			$ 10,944		$ 0
Stated interest rate							1.60%
Goodwill impairments														2,110
Weekengo
Related Party Transaction
Equity method purchase price allocation, tangible assets											1,000			1,000
Goodwill											1,500			1,500
Payment to acquire equity method investment								$ 1,700	$ 673	$ 3,000
Equity method investment ownership percentage									26.60%	25.00%
Loss from share of equity loss and intangible asset amortization											51		$ 323	384	732
Weekengo | Technology related intangible
Related Party Transaction
Equity method purchase price allocation, intangible assets											485			$ 485
Intangible assets, useful life														3 years
Weekengo | Equity Method Investee
Related Party Transaction
Insertion order signed to advertise with Travelzoo										$ 2,100
Advertising services purchased											$ 23		$ 130	$ 383	$ 924
Discontinued Operations, Disposed of by Sale | Travelzoo Japan
Related Party Transaction
Term		3 years	3 years	3 years
Interest free loan amount		$ 430	¥ 46,000,000.0
Travelzoo Japan
Related Party Transaction
Percentage of ownership before transaction (up to)		100.00%	100.00%	100.00%
Pre-tax loss		$ 128
Proceeds from Divestiture of Businesses | ¥			¥ 1
Travelzoo Japan | Royalty Agreement Terms
Related Party Transaction
Term		5 years	5 years	5 years
Travelzoo Japan | Loan Issued to Travelzoo Japan
Related Party Transaction
Term		3 years	3 years	3 years
Travelzoo Singapore
Related Party Transaction
Percentage of ownership before transaction (up to)	100.00%
Proceeds from Divestiture of Businesses				$ 1
Travelzoo Singapore | Royalty Agreement Terms
Related Party Transaction
Term	5 years
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Related Party Transaction
Term					2 years
Amount received under PPP					$ 535	$ 3,100
Stated interest rate					1.00%

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