Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,906	$ 11,284
Accumulated Amortization	(10,057)	(10,778)
Total intangible assets	$ 849	$ 506
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	18 months
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	17 years
Customer, Affiliate and Advertiser Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives		5 years
Gross Carrying Amount	$ 6,500	$ 6,938
Accumulated Amortization	(6,256)	$ (6,938)
Total intangible assets	$ 244
Customer, Affiliate and Advertiser Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Customer, Affiliate and Advertiser Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	17 years
Developed Websites, Technology and Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years	10 years
Gross Carrying Amount	$ 1,502	$ 1,342
Accumulated Amortization	(958)	(907)
Total intangible assets	544	$ 435
Trademarks, Trade Name and Domain Name [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives		8 years
Gross Carrying Amount	1,784	$ 1,802
Accumulated Amortization	(1,730)	(1,731)
Total intangible assets	$ 54	$ 71
Trademarks, Trade Name and Domain Name [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Trademarks, Trade Name and Domain Name [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	8 years
Proprietary User Information Database and Internet Traffic [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years	5 years
Gross Carrying Amount	$ 1,110	$ 1,202
Accumulated Amortization	$ (1,110)	$ (1,202)
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year 6 months
Gross Carrying Amount	$ 10
Accumulated Amortization	(3)
Total intangible assets	$ 7