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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Breakdown of revenues by type and segment
Revenues	$ 26,997	$ 24,687	$ 26,411	$ 28,429	$ 26,814	$ 26,823	$ 29,798	$ 30,828	$ 106,524	$ 114,263	$ 123,961
Travel
Breakdown of revenues by type and segment
Revenues									90,052	94,180	99,114
Local
Breakdown of revenues by type and segment
Revenues									16,472	20,083	24,847
Asia Pacific
Breakdown of revenues by type and segment
Revenues									7,519	9,698	10,649
Asia Pacific | Travel
Breakdown of revenues by type and segment
Revenues									6,992	8,845	9,355
Asia Pacific | Local
Breakdown of revenues by type and segment
Revenues									527	853	1,294
Europe
Breakdown of revenues by type and segment
Revenues									33,681	36,907	39,736
Europe | Travel
Breakdown of revenues by type and segment
Revenues									29,180	31,087	33,603
Europe | Local
Breakdown of revenues by type and segment
Revenues									4,501	5,820	6,133
North America
Breakdown of revenues by type and segment
Revenues									65,324	67,658	73,576
North America | Travel
Breakdown of revenues by type and segment
Revenues									53,880	54,248	56,156
North America | Local
Breakdown of revenues by type and segment
Revenues									$ 11,444	$ 13,410	$ 17,420

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Breakdown of revenues by type and segment.

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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