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Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Breakdown of revenues by type and segment    
Total revenues $ 30,884 $ 28,429
Asia Pacific    
Breakdown of revenues by type and segment    
Total revenues 2,022 1,813
Europe    
Breakdown of revenues by type and segment    
Total revenues 10,280 9,071
North America    
Breakdown of revenues by type and segment    
Total revenues 18,582 17,545
Travel    
Breakdown of revenues by type and segment    
Total revenues 26,990 24,532
Travel | Asia Pacific    
Breakdown of revenues by type and segment    
Total revenues 1,901 1,668
Travel | Europe    
Breakdown of revenues by type and segment    
Total revenues 9,053 8,005
Travel | North America    
Breakdown of revenues by type and segment    
Total revenues 16,036 14,859
Local    
Breakdown of revenues by type and segment    
Total revenues 3,894 3,897
Local | Asia Pacific    
Breakdown of revenues by type and segment    
Total revenues 121 145
Local | Europe    
Breakdown of revenues by type and segment    
Total revenues 1,227 1,066
Local | North America    
Breakdown of revenues by type and segment    
Total revenues $ 2,546 $ 2,686