Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Breakdown of revenues by type and segment
Total revenues	$ 33,728	$ 36,307	$ 109,665	$ 118,949
North America
Breakdown of revenues by type and segment
Total revenues	20,693	22,922	69,448	74,907
Europe
Breakdown of revenues by type and segment
Total revenues	10,317	10,595	32,138	35,745
Asia Pacific
Breakdown of revenues by type and segment
Total revenues	2,718	2,790	8,079	8,297
Travel
Breakdown of revenues by type and segment
Total revenues	23,602	24,737	76,538	81,186
Travel | North America
Breakdown of revenues by type and segment
Total revenues	12,986	13,943	43,716	46,357
Travel | Europe
Breakdown of revenues by type and segment
Total revenues	8,190	8,472	25,793	27,913
Travel | Asia Pacific
Breakdown of revenues by type and segment
Total revenues	2,426	2,322	7,029	6,916
Search
Breakdown of revenues by type and segment
Total revenues	4,544	4,696	14,547	15,133
Search | North America
Breakdown of revenues by type and segment
Total revenues	3,816	4,216	12,453	12,441
Search | Europe
Breakdown of revenues by type and segment
Total revenues	725	455	2,064	2,604
Search | Asia Pacific
Breakdown of revenues by type and segment
Total revenues	3	25	30	88
Local
Breakdown of revenues by type and segment
Total revenues	5,582	6,874	18,580	22,630
Local | North America
Breakdown of revenues by type and segment
Total revenues	3,891	4,763	13,279	16,109
Local | Europe
Breakdown of revenues by type and segment
Total revenues	1,402	1,668	4,281	5,228
Local | Asia Pacific
Breakdown of revenues by type and segment
Total revenues	$ 289	$ 443	$ 1,020	$ 1,293