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Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Breakdown of revenues by type and segment        
Total revenues $ 24,687 $ 26,823 $ 79,527 $ 87,450
Asia Pacific        
Breakdown of revenues by type and segment        
Total revenues 1,773 2,557 5,536 7,251
Europe        
Breakdown of revenues by type and segment        
Total revenues 7,946 8,474 24,914 28,490
North America        
Breakdown of revenues by type and segment        
Total revenues 14,968 15,792 49,077 51,709
Travel        
Breakdown of revenues by type and segment        
Total revenues 20,842 22,185 67,938 72,512
Travel | Asia Pacific        
Breakdown of revenues by type and segment        
Total revenues 1,644 2,334 5,170 6,582
Travel | Europe        
Breakdown of revenues by type and segment        
Total revenues 7,052 7,357 21,852 24,440
Travel | North America        
Breakdown of revenues by type and segment        
Total revenues 12,146 12,494 40,916 41,490
Local        
Breakdown of revenues by type and segment        
Total revenues 3,845 4,638 11,589 14,938
Local | Asia Pacific        
Breakdown of revenues by type and segment        
Total revenues 129 223 366 669
Local | Europe        
Breakdown of revenues by type and segment        
Total revenues 894 1,117 3,062 4,050
Local | North America        
Breakdown of revenues by type and segment        
Total revenues $ 2,822 $ 3,298 $ 8,161 $ 10,219