CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue		$ 56,679	$ 59,334	$ 112,144	$ 119,104
Costs and expenses (1) (2)
Cost of revenue (3)	[1],[2],[3]	17,508	18,052	33,372	34,307
Sales and marketing	[2],[3]	23,088	24,382	45,764	48,676
General and administrative	[2],[3]	10,161	10,306	19,690	20,470
Product development	[2],[3]	10,719	10,109	19,933	19,909
Restructuring costs	[2],[3]	0	2,988	0	2,988
Amortization of purchased intangibles	[2],[3]	1,017	1,178	1,941	2,490
Total costs and expenses	[2],[3]	62,493	67,015	120,700	128,840
Loss from operations		(5,814)	(7,681)	(8,556)	(9,736)
Other (expense) income, net		(646)	229	(12)	(2)
Loss before provision for (benefit from) income taxes		(6,460)	(7,452)	(8,568)	(9,738)
Provision for (benefit from) income taxes		1,306	(2,098)	1,861	(2,326)
Net loss		$ (7,766)	$ (5,354)	$ (10,429)	$ (7,412)
Basic net (loss) income per common share (in dollars per share)		$ (0.14)	$ (0.09)	$ (0.19)	$ (0.13)
Diluted net (loss) income per common share (in dollars per share)		$ (0.14)	$ (0.09)	$ (0.19)	$ (0.13)
Weighted average shares outstanding used in basic net (loss) income per common share calculation (in shares)		55,965,525	56,491,989	56,174,603	56,392,240
Weighted average shares outstanding used in diluted net (loss) income per common share calculation (in shares)		55,965,525	56,491,989	56,174,603	56,392,240
Stock compensation expense				$ 5,345	$ 5,906
Cost of revenue [Member]
Costs and expenses (1) (2)
Amortization of purchased intangibles		$ 697	$ 839	1,394	1,679
Stock compensation expense		211	476	221	804
Depreciation expense		2,374	2,323	4,712	4,225
Sales and marketing expense [Member]
Costs and expenses (1) (2)
Stock compensation expense		804	937	1,434	1,532
Depreciation expense		521	314	800	565
General and administrative expense [Member]
Costs and expenses (1) (2)
Stock compensation expense		941	746	1,793	1,678
Depreciation expense		382	236	780	473
Product development expense [Member]
Costs and expenses (1) (2)
Stock compensation expense		1,070	953	1,897	1,892
Depreciation expense		$ 351	$ 209	$ 502	$ 397

[1] Amounts include amortization expense as follows: Cost of revenue $697 thousand and $839 thousand for the three months ended June 30, 2016 and 2015, respectively.Amounts include amortization expense as follows: Cost of revenue $1,394 thousand and $1,679 thousand for the three months ended June 30, 2016 and 2015, respectively.

[2] Amounts include depreciation expense as follows: Cost of revenue $2,374 thousand and $2,323 thousand for the three months ended June 30, 2016 and 2015, respectively, Sales and marketing $521 thousand and $314 thousand for the three months ended June 30, 2016 and 2015, respectively, General and administrative $382 thousand and $236 thousand for the three months ended June 30, 2016 and 2015, respectively, and Product development $351 thousand and $209 thousand for the three months ended June 30, 2016 and 2015, respectively. Amounts include depreciation expense as follows: Cost of revenue $4,712 thousand and $4,225 thousand for the three months ended June 30, 2016 and 2015, respectively, Sales and marketing $800 thousand and $565 thousand for the three months ended June 30, 2016 and 2015, respectively, General and administrative $780 thousand and $473 thousand for the three months ended June 30, 2016 and 2015, respectively, and Product development $502 thousand and $397 thousand for the three months ended June 30, 2016 and 2015, respectively.

[3] Amounts include stock compensation expense as follows: Cost of revenue $211 thousand and $476 thousand for the three months ended June 30, 2016 and 2015, respectively, Sales and marketing $804 thousand and $937 thousand for the three months ended June 30, 2016 and 2015, respectively, General and administrative $941 thousand and $746 thousand for the three months ended June 30, 2016 and 2015, respectively and Product development $1,070 thousand and $953 thousand for the three months ended June 30, 2016 and 2015, respectively. Amounts include stock compensation expense as follows: Cost of revenue $221 thousand and $804 thousand for the six months ended June 30, 2016 and 2015, respectively, Sales and marketing $1,434 thousand and $1,532 thousand for the six months ended June 30, 2016 and 2015, respectively, General and administrative $1,793 thousand and $1,678 thousand for the six months ended June 30, 2016 and 2015, respectively and Product development $1,897 thousand and $1,892 thousand for the six months ended June 30, 2016 and 2015, respectively.