Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax provision (benefit) on unrealized gain (loss) on investments	$ (2)	$ 1	$ 10
Cost of Online Revenue [Member]
Allocated stock-based compensation expense	173	202	273
Cost of Events Revenue [Member]
Allocated stock-based compensation expense	18	18	91
Selling and Marketing [Member]
Allocated stock-based compensation expense	2,751	2,888	4,713
Product and Development [Member]
Allocated stock-based compensation expense	212	265	443
General and Administrative [Member]
Allocated stock-based compensation expense	$ 2,431	$ 1,894	$ 1,949