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Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Breakdown of revenues by type and segment
Revenues	$ 27,062	$ 25,301	$ 28,075	$ 30,884	$ 26,997	$ 24,687	$ 26,411	$ 28,429	$ 111,322	$ 106,524	$ 114,263
Travel
Breakdown of revenues by type and segment
Revenues									94,352	90,052	94,180
Local
Breakdown of revenues by type and segment
Revenues									16,970	16,472	20,083
Asia Pacific
Breakdown of revenues by type and segment
Revenues									7,859	7,519	9,698
Asia Pacific | Travel
Breakdown of revenues by type and segment
Revenues									7,351	6,992	8,845
Asia Pacific | Local
Breakdown of revenues by type and segment
Revenues									508	527	853
Europe
Breakdown of revenues by type and segment
Revenues									36,149	33,681	36,907
Europe | Travel
Breakdown of revenues by type and segment
Revenues									30,856	29,180	31,087
Europe | Local
Breakdown of revenues by type and segment
Revenues									5,293	4,501	5,820
North America
Breakdown of revenues by type and segment
Revenues									67,314	65,324	67,658
North America | Travel
Breakdown of revenues by type and segment
Revenues									56,145	53,880	54,248
North America | Local
Breakdown of revenues by type and segment
Revenues									$ 11,169	$ 11,444	$ 13,410

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Breakdown of revenues by type and segment.

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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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-Name Accounting Standards Codification
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