Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Breakdown of revenues by type and segment
Total revenues	$ 34,804	$ 39,145
Asia Pacific
Breakdown of revenues by type and segment
Total revenues	2,260	2,648
Europe
Breakdown of revenues by type and segment
Total revenues	10,892	11,562
North America
Breakdown of revenues by type and segment
Total revenues	21,652	24,935
Travel
Breakdown of revenues by type and segment
Total revenues	25,791	27,749
Travel | Asia Pacific
Breakdown of revenues by type and segment
Total revenues	2,027	2,260
Travel | Europe
Breakdown of revenues by type and segment
Total revenues	9,007	9,449
Travel | North America
Breakdown of revenues by type and segment
Total revenues	14,757	16,040
Search
Breakdown of revenues by type and segment
Total revenues	3,976	5,389
Search | Asia Pacific
Breakdown of revenues by type and segment
Total revenues	5	11
Search | Europe
Breakdown of revenues by type and segment
Total revenues	333	640
Search | North America
Breakdown of revenues by type and segment
Total revenues	3,638	4,738
Local
Breakdown of revenues by type and segment
Total revenues	5,037	6,007
Local | Asia Pacific
Breakdown of revenues by type and segment
Total revenues	228	377
Local | Europe
Breakdown of revenues by type and segment
Total revenues	1,552	1,473
Local | North America
Breakdown of revenues by type and segment
Total revenues	$ 3,257	$ 4,157