CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Revenue	$ 51,087		$ 43,229		$ 98,915		$ 85,725
Costs and expenses (1) (2):
Cost of revenue	13,161	[1],[2]	10,612	[1],[2]	24,896	[1],[2]	20,746	[1],[2]
Sales and marketing	20,077	[1],[2]	15,499	[1],[2]	38,472	[1],[2]	29,977	[1],[2]
General and administrative	9,788	[1],[2]	9,835	[1],[2]	19,286	[1],[2]	20,072	[1],[2]
Product development	9,336	[1],[2]	9,047	[1],[2]	18,287	[1],[2]	17,068	[1],[2]
Amortization of purchased intangibles	206		224		396		448
Total costs and expenses	52,568		45,217		101,337		88,311
Operating income (loss)	(1,481)		(1,988)		(2,422)		(2,586)
Other income (expense)	45		20		(38)		55
Loss before benefit from income taxes	(1,436)		(1,968)		(2,460)		(2,531)
Benefit from income taxes	(224)		(138)		(454)		(470)
Net loss	(1,212)		(1,830)		(2,006)		(2,061)
Basic net (loss) income per common share (in dollars per share)	$ (0.02)		$ (0.03)		$ (0.04)		$ (0.04)
Diluted net (loss) income per common share (in dollars per share)	$ (0.02)		$ (0.03)		$ (0.04)		$ (0.04)
Weighted average shares outstanding used in basic net (loss) income per common share calculation (in shares)	54,189,722		54,806,694		54,766,811		55,332,449
Weighted average shares outstanding used in diluted net (loss) income per common share calculation (in shares)	54,189,722		54,806,694		54,766,811		55,332,449
Share-based Compensation	3,207		2,901		5,904		5,952
Cost of revenue [Member]
Costs and expenses (1) (2):
Share-based Compensation	484		501		844		922
Depreciation	1,646		1,540		3,044		3,120
Sales and marketing expense [Member]
Costs and expenses (1) (2):
Share-based Compensation	923		569		1,737		1,315
Depreciation	201		22		408		45
General and administrative expense [Member]
Costs and expenses (1) (2):
Share-based Compensation	869		1,019		1,712		2,034
Depreciation	214		261		414		523
Product development expense [Member]
Costs and expenses (1) (2):
Share-based Compensation	931		812		1,611		1,681
Depreciation	$ 172		$ 175		$ 349		$ 360

[1] Amounts include stock compensation expense as follows: Cost of revenue $484 and $501 for the three months ended June 30, 2014 and 2013, respectively and $844 and $922 for the six months ended June 30, 2014 and 2013, respectively, Sales and marketing $923 and $569 for the three months ended June 30, 2014 and 2013, respectively and $1,737 and $1,315 for the six months ended June 30, 2014 and 2013, respectively, General and administrative $869 and $1,019 for the three months ended June 30, 2014 and 2013, respectively and $1,712 and $2,034 for the six months ended June 30, 2014 and 2013, respectively, and Product development $931 and $812 for the three months ended June 30, 2014 and 2013, respectively and $1,611 and $1,681 for the six months ended June 30, 2014 and 2013, respectively.

[2] Amounts include depreciation expense as follows: Cost of revenue $1,646 and $1,540 for the three months ended June 30, 2014 and 2013, respectively and $3,044 and $3,120 for the six months ended June 30, 2014 and 2013, respectively, Sales and marketing $201 and $22 for the three months ended June 30, 2014 and 2013, respectively and $408 and $45 for the six months ended June 30, 2014 and 2013, respectively, General and administrative $214 and $261 for the three months ended June 30, 2014 and 2013, respectively and $414 and $523 for the six months ended June 30, 2014 and 2013, respectively, and Product development $172 and $175 for the three months ended June 30, 2014 and 2013, respectively and $349 and $360 for the six months ended June 30, 2014 and 2013, respectively.