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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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Summary of operating results from continuing operations and assets by business segment
Revenues	$ 26,411	$ 29,798	$ 54,840	$ 60,626
Operating profit (loss)	1,386	3,437	3,448	6,283
Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues	1,950	2,438	3,763	4,693
Operating profit (loss)	(1,165)	(1,233)	(2,706)	(2,282)
Europe
Summary of operating results from continuing operations and assets by business segment
Revenues	7,897	9,457	16,968	20,015
Operating profit (loss)	268	1,704	1,217	3,611
North America
Summary of operating results from continuing operations and assets by business segment
Revenues	16,564	17,903	34,109	35,918
Operating profit (loss)	2,283	2,966	4,937	4,954
Operating Segments | Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues	1,963	2,401	3,807	4,651
Operating Segments | Europe
Summary of operating results from continuing operations and assets by business segment
Revenues	8,005	9,638	17,223	20,279
Operating Segments | North America
Summary of operating results from continuing operations and assets by business segment
Revenues	16,443	17,759	33,810	35,696
Other | Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues	(13)	37	(44)	42
Other | Europe
Summary of operating results from continuing operations and assets by business segment
Revenues	(108)	(181)	(255)	(264)
Other | North America
Summary of operating results from continuing operations and assets by business segment
Revenues	$ 121	$ 144	$ 299	$ 222

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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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