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Segment Reporting and Significant Customer Information - Revenue by Type and Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 28,184	$ 28,075	$ 59,009	$ 58,959
Asia Pacific
Revenues from External Customers and Long-Lived Assets
Total revenues	1,580	2,064	3,245	4,086
Europe
Revenues from External Customers and Long-Lived Assets
Total revenues	8,682	8,500	19,255	18,780
North America
Revenues from External Customers and Long-Lived Assets
Total revenues	17,922	17,511	36,509	36,093
Travel
Revenues from External Customers and Long-Lived Assets
Total revenues	24,349	23,935	51,778	50,925
Travel | Asia Pacific
Revenues from External Customers and Long-Lived Assets
Total revenues	1,532	1,930	3,132	3,831
Travel | Europe
Revenues from External Customers and Long-Lived Assets
Total revenues	7,565	7,409	17,077	16,462
Travel | North America
Revenues from External Customers and Long-Lived Assets
Total revenues	15,252	14,596	31,569	30,632
Local
Revenues from External Customers and Long-Lived Assets
Total revenues	3,835	4,140	7,231	8,034
Local | Asia Pacific
Revenues from External Customers and Long-Lived Assets
Total revenues	48	134	113	255
Local | Europe
Revenues from External Customers and Long-Lived Assets
Total revenues	1,117	1,091	2,178	2,318
Local | North America
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 2,670	$ 2,915	$ 4,940	$ 5,461

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- 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://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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-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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+ References

No definition available.

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