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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								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Summary of operating results from continuing operations and assets by business segment
Revenues	$ 26,898	$ 25,505	$ 28,184	$ 30,825	$ 27,062	$ 25,301	$ 28,075	$ 30,884	$ 111,412	$ 111,322
Operating income (loss)	$ 855	$ 1,214	$ 2,424	$ 4,971	$ 2,789	$ 714	$ 1,078	$ 3,657	9,464	8,238
Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues									6,490	7,859
Operating income (loss)									(7,488)	(6,322)
Asia Pacific | Operating Segments
Summary of operating results from continuing operations and assets by business segment
Revenues									6,402	7,869
Asia Pacific | Intersegment Eliminations
Summary of operating results from continuing operations and assets by business segment
Revenues									88	(10)
Europe
Summary of operating results from continuing operations and assets by business segment
Revenues									36,898	36,149
Operating income (loss)									4,461	4,973
Europe | Operating Segments
Summary of operating results from continuing operations and assets by business segment
Revenues									39,556	36,468
Europe | Intersegment Eliminations
Summary of operating results from continuing operations and assets by business segment
Revenues									(2,658)	(319)
North America
Summary of operating results from continuing operations and assets by business segment
Revenues									68,024	67,314
Operating income (loss)									12,491	9,587
North America | Operating Segments
Summary of operating results from continuing operations and assets by business segment
Revenues									65,454	66,985
North America | Intersegment Eliminations
Summary of operating results from continuing operations and assets by business segment
Revenues									$ 2,570	$ 329

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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