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Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 30,825	$ 30,884
Asia Pacific
Revenues from External Customers and Long-Lived Assets
Total revenues	1,665	2,022
Europe
Revenues from External Customers and Long-Lived Assets
Total revenues	10,573	10,280
North America
Revenues from External Customers and Long-Lived Assets
Total revenues	18,587	18,582
Travel
Revenues from External Customers and Long-Lived Assets
Total revenues	27,429	26,990
Travel | Asia Pacific
Revenues from External Customers and Long-Lived Assets
Total revenues	1,600	1,901
Travel | Europe
Revenues from External Customers and Long-Lived Assets
Total revenues	9,512	9,053
Travel | North America
Revenues from External Customers and Long-Lived Assets
Total revenues	16,317	16,036
Local
Revenues from External Customers and Long-Lived Assets
Total revenues	3,396	3,894
Local | Asia Pacific
Revenues from External Customers and Long-Lived Assets
Total revenues	65	121
Local | Europe
Revenues from External Customers and Long-Lived Assets
Total revenues	1,061	1,227
Local | North America
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 2,270	$ 2,546

X

- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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- Definition

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+ References

No definition available.

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