CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue	$ 133,089	$ 109,862	$ 87,490
Operating expenses:
Cost of revenue	33,195	29,640	21,076
Product development	20,222	15,711	12,111
Sales and marketing	38,884	32,835	27,355
General and administrative	21,044	17,077	13,417
Amortization of intangibles	109	259	745
Total operating expenses	113,454	95,522	74,704
Income from operations	19,635	14,340	12,786
Other (expense) income:
Financial expense	(548)	(106)	(80)
Interest income	63	99	94
Total other (expense) income, net	(485)	(7)	14
Income before provision for income taxes	19,150	14,333	12,800
Provision for income taxes	7,112	5,074	5,037
Net income	$ 12,038	$ 9,259	$ 7,763
Basic net income per common share	$ 0.23	$ 0.18	$ 0.16
Diluted net income per common share	$ 0.22	$ 0.18	$ 0.16
Weighted average shares outstanding used in basic net income per common share calculation	52,876,999	50,721,880	47,962,688
Weighted average shares outstanding used in diluted net income per common share calculation	55,008,742	52,907,541	49,008,440