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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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