Unaudited Quarterly Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Quarterly Financial Information [Line Items]
Revenues	$ 62,800	$ 62,014	$ 60,410	$ 59,404	$ 59,959	$ 60,315	$ 60,525	$ 63,365	$ 244,628		$ 244,164		$ 256,259
Direct costs of network, sales and services, exclusive of depreciation and amortization	29,924	30,787	30,569	29,030	30,508	31,567	31,263	34,085	120,310		127,423		143,016
Direct costs of customer support	5,387	5,407	5,374	5,110	5,282	5,033	4,606	4,940	21,278		19,861		18,034
Direct costs of amortization of acquired technologies	875	875	875	875	874	979	979	979	3,500	[1]	3,811	[1]	8,349	[1]
Restructuring and impairments	1,217	123	1,304	189	210		1,183	18	2,833		1,411		54,698
Net (loss) income	$ 4,198	$ (1,788)	$ (2,612)	$ (1,500)	$ (429)	$ (1,662)	$ (1,271)	$ (260)	$ (1,702)		$ (3,622)		$ (69,725)
Basic and diluted net (loss) income per share	$ 0.08	$ (0.04)	$ (0.05)	$ (0.03)	$ (0.01)	$ (0.03)	$ (0.03)	$ (0.01)	$ (0.03)		$ (0.07)		$ (1.41)

[1] Amortization of acquired technologies during the year ended December 31, 2009 included impairment charges of $4.1 million for acquired CDN advertising technology.