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Summary of Significant Accounting Policies - Narrative (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) office | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($)
Accounting Policies |  |  |  |  |
Advertising expense |  | $ 8,500,000 | $ 8,600,000 | $ 10,400,000 |
Total foreign currency transaction gain (loss) |  | (42,000) | 354,000 | 315,000 |
Impairment of software |  | 0 | 0 | 0 |
Decrease to accounts payable |  | (17,129,000) | (19,105,000) |  |
Decrease to deferred tax assets noncurrent from reclassification |  | (1,645,000) | (1,516,000) |  |
Cumulative effect adjustment from the adoption of ASC 606 |  |  |  |  | $ 1,314,000
Deferred revenue |  | 1,300,000 |  |  | 825,000
Deferred revenue, revenue recognized in period |  | $ 693,000 |  |  |
Minimum |  |  |  |  |
Accounting Policies |  |  |  |  |
Number of offices (more than) | office |  | 25 |  |  |
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 |  | 50.50% |  |  |
Other Income (Loss) |  |  |  |  |
Accounting Policies |  |  |  |  |
Total foreign currency transaction gain (loss) |  | $ 135,000 | $ 158,000 | $ (211,000) |
WeekenGO |  |  |  |  |
Accounting Policies |  |  |  |  |
Payments to acquire equity method investments | $ 3,000,000 |  |  |  |
Ownership percentage | 25.00% |  |  |  |
Equity method investment, related identifiable tangible assets | $ 1,000,000 |  |  |  |
Goodwill | 1,500,000 |  |  |  |
Loss share of investee loss and amortization |  | 218,000 |  |  |
WeekenGO | Equity Method Investee |  |  |  |  |
Accounting Policies |  |  |  |  |
Future expected revenue |  | 2,100,000 |  |  |
Purchases from related party |  | $ 319,000 |  |  |
Technology-Based Intangible Assets | WeekenGO |  |  |  |  |
Accounting Policies |  |  |  |  |
Equity method investment, related identifiable intangible assets | $ 485,000 |  |  |  |
Finite-lived intangible asset, useful life | 3 years |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
Accounting Policies |  |  |  |  |
Decrease to accounts payable |  |  |  |  | 1,600,000
Decrease to deferred tax assets noncurrent from reclassification |  |  |  |  | 270,000
Retained Earnings |  |  |  |  |
Accounting Policies |  |  |  |  |
Cumulative effect adjustment from the adoption of ASC 606 |  |  |  |  | 1,314,000
Retained Earnings | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
Accounting Policies |  |  |  |  |
Cumulative effect adjustment from the adoption of ASC 606 |  |  |  |  | $ 1,300,000

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