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Intangible and other assets, net (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Internet Domain Names (Textual) [Abstract]
Cost incurred to renew or extend term for domain names	$ 91,000		$ 2,300,000
Amortization expense for internet domains	76,000	274,000	443,000	886,000
Estimated amortization expense based on current amount of domains, remainder of 2012	102,000		102,000
Estimated amortization expense based on current amount of domains, 2013	221,000		221,000
Estimated amortization expense based on current amount of domains, 2014	$ 40,000		$ 40,000
Weighted average renewal period for registration fees			1 year