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Segment Reporting and Significant Customer Information - Operating Results from Continuing Operations and Assets by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Summary of operating results from continuing operations and assets by business segment
Revenues	$ 30,884	$ 28,429
Operating profit (loss)	3,657	2,062
Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues	2,022	1,813
Operating profit (loss)	(1,740)	(1,541)
Europe
Summary of operating results from continuing operations and assets by business segment
Revenues	10,280	9,071
Operating profit (loss)	1,966	949
North America
Summary of operating results from continuing operations and assets by business segment
Revenues	18,582	17,545
Operating profit (loss)	3,431	2,654
Operating Segments | Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues	2,042	1,844
Operating Segments | Europe
Summary of operating results from continuing operations and assets by business segment
Revenues	10,332	9,218
Operating Segments | North America
Summary of operating results from continuing operations and assets by business segment
Revenues	18,510	17,367
Elimination | Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues	(20)	(31)
Elimination | Europe
Summary of operating results from continuing operations and assets by business segment
Revenues	(52)	(147)
Elimination | North America
Summary of operating results from continuing operations and assets by business segment
Revenues	$ 72	$ 178

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Summary of segment reporting information profit loss.

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

+ References

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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