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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Breakdown of revenues by type and segment
Total revenues	$ 25,301	$ 24,687	$ 84,260	$ 79,527
Asia Pacific
Breakdown of revenues by type and segment
Total revenues	1,987	1,773	6,073	5,536
Europe
Breakdown of revenues by type and segment
Total revenues	8,378	7,946	27,158	24,914
North America
Breakdown of revenues by type and segment
Total revenues	14,936	14,968	51,029	49,077
Travel
Breakdown of revenues by type and segment
Total revenues	21,462	20,842	72,387	67,938
Travel | Asia Pacific
Breakdown of revenues by type and segment
Total revenues	1,851	1,644	5,682	5,170
Travel | Europe
Breakdown of revenues by type and segment
Total revenues	7,387	7,052	23,849	21,852
Travel | North America
Breakdown of revenues by type and segment
Total revenues	12,224	12,146	42,856	40,916
Local
Breakdown of revenues by type and segment
Total revenues	3,839	3,845	11,873	11,589
Local | Asia Pacific
Breakdown of revenues by type and segment
Total revenues	136	129	391	366
Local | Europe
Breakdown of revenues by type and segment
Total revenues	991	894	3,309	3,062
Local | North America
Breakdown of revenues by type and segment
Total revenues	$ 2,712	$ 2,822	$ 8,173	$ 8,161

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Breakdown of revenues by type and segment.

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No definition available.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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