CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue		$ 56,493,000	$ 54,518,000	$ 161,486,000	$ 166,662,000
Costs and expenses
Cost of revenue	[1],[2],[3]	14,541,000	14,837,000	43,456,000	48,210,000
Sales and marketing	[2],[3]	21,603,000	22,067,000	66,695,000	67,831,000
General and administrative	[2],[3]	10,398,000	10,069,000	30,528,000	29,758,000
Product development	[2],[3]	9,726,000	9,495,000	29,011,000	29,428,000
Restructuring costs		0	(384,000)	2,315,000	(384,000)
Amortization of purchased intangibles		470,000	1,013,000	1,412,000	2,954,000
Total costs and expenses	[2],[3]	56,738,000	57,097,000	173,417,000	177,797,000
Loss from operations		(245,000)	(2,579,000)	(11,931,000)	(11,135,000)
Other income (expense), net		191,000	(123,000)	412,000	(135,000)
Loss before provision for income taxes		(54,000)	(2,702,000)	(11,519,000)	(11,270,000)
Provision for income taxes		1,256,000	3,177,000	3,000,000	5,038,000
Net loss		$ (1,310,000)	$ (5,879,000)	$ (14,519,000)	$ (16,308,000)
Net loss per share of common stock:
Basic net loss per common share (in dollars per share)		$ (0.02)	$ (0.10)	$ (0.26)	$ (0.29)
Diluted net loss per common share (in dollars per share)		$ (0.02)	$ (0.10)	$ (0.26)	$ (0.29)
Weighted-average shares used to compute net loss per share:
Weighted average shares outstanding used in basic net loss per common share calculation (in shares)		56,524,990	56,047,645	56,153,428	56,131,818
Weighted average shares outstanding used in diluted net loss per common share calculation (in shares)		56,524,990	56,047,645	56,153,428	56,131,818
Cost of revenue [Member]
Costs and expenses
Amortization of purchased intangibles		$ 639,000	$ 697,000	$ 2,556,000	$ 2,091,000
Additional Information on Operating Expenses
Stock-based compensation expense		108,000	121,000	301,000	342,000
Depreciation expense		1,715,000	1,756,000	5,350,000	6,469,000
Sales and marketing [Member]
Additional Information on Operating Expenses
Stock-based compensation expense		576,000	502,000	1,984,000	1,936,000
Depreciation expense		417,000	212,000	1,206,000	1,012,000
General and administrative [Member]
Additional Information on Operating Expenses
Stock-based compensation expense		622,000	759,000	2,058,000	2,552,000
Depreciation expense		321,000	435,000	911,000	1,215,000
Product development [Member]
Additional Information on Operating Expenses
Stock-based compensation expense		537,000	873,000	1,760,000	2,770,000
Depreciation expense		$ 726,000	$ 247,000	$ 1,550,000	$ 749,000

[1] Amounts include amortization expense as follows: Cost of revenue $639 thousand and $697 thousand thousand for the three months ended September 30, 2017 and 2016, respectively.Amounts include amortization expense as follows: Cost of revenue $2,556 thousand and $2,091 thousand thousand for the three months ended September 30, 2017 and 2016, respectively.

[2] Amounts include depreciation expense as follows: Cost of revenue $1,715 thousand and $1,756 thousand for the three months ended September 30, 2017 and 2016, respectively, Sales and marketing $417 thousand and $212 thousand for the three months ended September 30, 2017 and 2016, respectively, General and administrative $321 thousand and $435 thousand for the three months ended September 30, 2017 and 2016, respectively, and Product development $726 thousand and $247 thousand for the three months ended September 30, 2017 and 2016, respectively. Amounts include depreciation expense as follows: Cost of revenue $5,350 thousand and $$6,469 thousand for the three months ended September 30, 2017 and 2016, respectively, Sales and marketing $1,206 thousand and $1,012 thousand for the three months ended September 30, 2017 and 2016, respectively, General and administrative $911 thousand and $1,215 thousand for the three months ended September 30, 2017 and 2016, respectively, and Product development $1,550 thousand and $749 thousand for the three months ended September 30, 2017 and 2016, respectively.

[3] Amounts include stock compensation expense as follows: Cost of revenue $108 thousand and $121 thousand for the three months ended September 30, 2017 and 2016, respectively, Sales and marketing $576 thousand and $502 thousand for the three months ended September 30, 2017 and 2016, respectively, General and administrative $622 thousand and $759 thousand for the three months ended September 30, 2017 and 2016, respectively and Product development $537 thousand and $873 thousand for the three months ended September 30, 2017 and 2016, respectively. Amounts include stock compensation expense as follows: Cost of revenue $301 thousand and $342 thousand for the nine months ended September 30, 2017 and 2016, respectively, Sales and marketing $1,984 thousand and $1,936 thousand for the nine months ended September 30, 2017 and 2016, respectively, General and administrative $2,058 thousand and $2,552 thousand for the nine months ended September 30, 2017 and 2016, respectively and Product development $1,760 thousand and $2,770 thousand for the nine months ended September 30, 2017 and 2016, respectively.