Customer Voucher Liability, Current

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- Definition

Customer Voucher Refund Liability

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- Definition

Disposal Group, Including Discontinued Operations, Debt Issued

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Equity Method Investment, Gain (Loss), Share Of Investee Income (Loss) And Intangible Asset Amortization

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Equity Method Investment, Related Identifiable Intangible Assets

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Equity Method Investment, Related Identifiable Tangible Assets

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- Definition

Merchant Payable, Current

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- Definition

Number Of Members

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Ownership Percentage Held By Related Party

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Working Capital

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Cash received for royalties during the current period.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction.

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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands, member in Millions						1 Months Ended			3 Months Ended				12 Months Ended
	Aug. 24, 2020	Jun. 16, 2020 USD ($)	Jun. 16, 2020 JPY (¥)	Jun. 16, 2020 SGD ($)	Jan. 13, 2020 USD ($)	Feb. 29, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Mar. 31, 2021 USD ($) member	Mar. 31, 2021 JPY (¥) member	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2005	Dec. 23, 2020
Related Party Transaction
Number of members \| member									30.0	30.0
Payment to acquire equity method investment									$ 0			$ 679
Goodwill									$ 10,944		$ 10,944		$ 10,944
Ownership percentage held by related party									39.40%
Deferred revenue									$ 2,400		1,300		1,300
Deferred revenue recognized									223
Voucher liability, current									18,600		15,200		15,200
Customer voucher refund liability									4,000		3,900		3,900
Merchant payable									70,094		57,104		57,104
Impairment of identifiable intangible assets												810
Goodwill impairments												2,100
Negative working capital									17,000
Travelzoo North America
Related Party Transaction
Deferred revenue									782
Travelzoo Europe
Related Party Transaction
Deferred revenue									$ 1,600
Jack’s Flight Club
Related Party Transaction
Number of members \| member									1.6	1.6
Percentage of ownership before transaction (up to)					100.00%
Goodwill					$ 13,054							10,944		$ 0
Goodwill impairments									$ 2,100			$ 2,110
Weekengo
Related Party Transaction
Equity method investment ownership percentage						33.70%	26.60%	25.00%								33.70%
Payment to acquire equity method investment						$ 1,700	$ 673	$ 3,000	1,800
Equity method purchase price allocation, tangible assets									1,000
Loss from share of equity loss and intangible asset amortization													384	882
Goodwill									1,500
Proceeds from sale of equity method investments									213
Realized gain (loss) on disposal													468
Letters of credit outstanding, amount									200
Finite-lived intangible assets, remaining amortization period															5 years
Amount of debt forgiven									822
Weekengo \| Technology related intangible
Related Party Transaction
Equity method purchase price allocation, intangible assets									$ 485
Intangible assets, useful life									3 years	3 years
Weekengo, Original Investment Agreement
Related Party Transaction
Payment to acquire equity method investment									$ 2,100
WeekenGO \| Equity Method Investee
Related Party Transaction
Advertising services purchased													$ 384	$ 1,200
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						430	¥ 46,000,000
Proceeds from divestiture of businesses \| ¥			¥ 1
Travelzoo Japan
Related Party Transaction
Percentage of ownership before transaction (up to)		100.00%	100.00%	100.00%
Pre-tax loss		$ 128
Royalty recognized									$ 9		$ 9
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
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
Trivago \| Weekengo
Related Party Transaction
Proceeds from sale of equity method investments									$ 2,900