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Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Breakdown of revenues by type and segment        
Total revenues $ 26,411 $ 29,798 $ 54,840 $ 60,626
Asia Pacific        
Breakdown of revenues by type and segment        
Total revenues 1,950 2,438 3,763 4,693
Europe        
Breakdown of revenues by type and segment        
Total revenues 7,897 9,457 16,968 20,015
North America        
Breakdown of revenues by type and segment        
Total revenues 16,564 17,903 34,109 35,918
Travel        
Breakdown of revenues by type and segment        
Total revenues 22,564 24,535 47,095 50,326
Travel | Asia Pacific        
Breakdown of revenues by type and segment        
Total revenues 1,858 2,220 3,525 4,247
Travel | Europe        
Breakdown of revenues by type and segment        
Total revenues 6,795 8,075 14,801 17,082
Travel | North America        
Breakdown of revenues by type and segment        
Total revenues 13,911 14,240 28,769 28,997
Local        
Breakdown of revenues by type and segment        
Total revenues 3,847 5,263 7,745 10,300
Local | Asia Pacific        
Breakdown of revenues by type and segment        
Total revenues 92 218 238 446
Local | Europe        
Breakdown of revenues by type and segment        
Total revenues 1,102 1,382 2,167 2,933
Local | North America        
Breakdown of revenues by type and segment        
Total revenues $ 2,653 $ 3,663 $ 5,340 $ 6,921