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Summary of Significant Accounting Policies - Narrative (Details) member in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 11, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) member office | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Accounting Policies |  |  |  |  |  |  |
Number of members | member |  |  |  | 30 |  |  |
Payments to acquire equity method investments |  |  |  | $ 673,000 | $ 3,083,000 |  |
Decrease in accounts payable related to the merchant payable |  |  |  | 20,406,000 | 17,129,000 |  |
Decrease to net deferred tax assets |  |  |  | 2,051,000 | 1,645,000 |  |
Net cumulative effect increase of retained earnings |  |  |  |  |  |  | $ 1,314,000
Deferred revenue |  |  |  | 896,000 | 1,300,000 |  |
Deferred revenue, revenue recognized in period |  |  |  | 1,100,000 |  |  |
Advertising costs |  |  |  | 10,300,000 | 8,500,000 |  |
Total foreign currency transaction gain (loss) |  |  |  | (80,000) | (42,000) |  |
Impairment of software |  |  |  | 0 | 0 |  |
Operating lease right-of-use assets |  |  |  | 8,886,000 |  |  |
Operating lease liability |  |  |  | $ 13,539,000 |  |  |
Minimum |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Number of offices (more than) | office |  |  |  | 22 |  |  |
Computer hardware and software | Minimum |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  | 3 years |  |  |
Computer hardware and software | Maximum |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  | 5 years |  |  |
Capitalized internal-use software and website development | Minimum |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  | 3 years |  |  |
Capitalized internal-use software and website development | Maximum |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  | 5 years |  |  |
Office equipment and office furniture | Minimum |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  | 3 years |  |  |
Office equipment and office furniture | Maximum |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  | 5 years |  |  |
Azzurro Capital, Inc. |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Percent of outstanding shares |  |  |  | 47.80% |  |  |
Other Income (Loss) |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Total foreign currency transaction gain (loss) |  |  |  | $ (64,000) | 135,000 |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  | $ 13,400,000 |
Operating lease liability |  |  |  |  |  | 16,000,000 |
Deferred rent liability |  |  |  |  |  | $ (2,600,000) |
WeekenGO |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Payments to acquire equity method investments |  | $ 673,000 | $ 3,000,000 |  |  |  |
Ownership interest percentage |  | 26.60% | 25.00% |  |  |  |
Equity method investment, related identifiable tangible assets |  |  | $ 1,000,000 |  |  |  |
Goodwill |  |  | 1,500,000 |  |  |  |
Loss share of investee loss and amortization |  |  |  | $ 882,000 | $ 218,000 |  |
Technology-Based Intangible Assets | WeekenGO |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Equity method investment, related identifiable intangible assets |  |  | $ 485,000 |  |  |  |
Finite-lived intangible asset, useful life |  |  | 3 years |  |  |  |
Including Holger Proxy |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Ownership percentage of voting power |  |  |  | 48.20% |  |  |
Subsequent Event | WeekenGO |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Payments to acquire equity method investments | $ 1,700,000 |  |  |  |  |  |
Ownership interest percentage | 33.70% |  |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Decrease in accounts payable related to the merchant payable |  |  |  |  |  |  | 1,600,000
Decrease to net deferred tax assets |  |  |  |  |  |  | 270,000
Retained Earnings |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Net cumulative effect increase of retained earnings |  |  |  |  |  |  | 1,314,000
Retained Earnings | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Accounting Policies |  |  |  |  |  |  |
Net cumulative effect increase of retained earnings |  |  |  |  |  |  | $ 1,300,000

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