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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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