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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Breakdown of revenues by type and segment
Revenues	$ 26,898	$ 25,505	$ 28,184	$ 30,825	$ 27,062	$ 25,301	$ 28,075	$ 30,884	$ 111,412	$ 111,322
Travel
Breakdown of revenues by type and segment
Revenues									96,218	94,352
Local
Breakdown of revenues by type and segment
Revenues									15,194	16,970
Asia Pacific
Breakdown of revenues by type and segment
Revenues									6,490	7,859
Asia Pacific | Travel
Breakdown of revenues by type and segment
Revenues									6,274	7,351
Asia Pacific | Local
Breakdown of revenues by type and segment
Revenues									216	508
Europe
Breakdown of revenues by type and segment
Revenues									36,898	36,149
Europe | Travel
Breakdown of revenues by type and segment
Revenues									32,081	30,856
Europe | Local
Breakdown of revenues by type and segment
Revenues									4,817	5,293
North America
Breakdown of revenues by type and segment
Revenues									68,024	67,314
North America | Travel
Breakdown of revenues by type and segment
Revenues									57,863	56,145
North America | Local
Breakdown of revenues by type and segment
Revenues									$ 10,161	$ 11,169

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Breakdown of revenues by type and segment.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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