Restructuring (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring expense	[1],[2]	$ 0	$ 2,988	$ 0	$ 2,988
Restructuring liability			1,716		1,716
Contract Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense					1,745
Restructuring liability			644		644
Severance and Other Associated Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense					1,243
Restructuring liability			1,072		1,072
Accrued Expenses And Other Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring liability			$ 1,700		$ 1,700

[1] 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.

[2] 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.