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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Summary of operating results from continuing operations and assets by business segment
Revenues	$ 25,301	$ 24,687	$ 84,260	$ 79,527
Operating profit (loss)	714	18	5,449	3,466
Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues	1,987	1,773	6,073	5,536
Operating profit (loss)	(1,600)	(1,679)	(4,812)	(4,385)
Europe
Summary of operating results from continuing operations and assets by business segment
Revenues	8,378	7,946	27,158	24,914
Operating profit (loss)	940	309	3,347	1,526
North America
Summary of operating results from continuing operations and assets by business segment
Revenues	14,936	14,968	51,029	49,077
Operating profit (loss)	1,374	1,388	6,914	6,325
Operating Segments
Summary of operating results from continuing operations and assets by business segment
Revenues			84,260	79,527
Operating Segments | Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues	1,977	1,767	6,092	5,574
Operating Segments | Europe
Summary of operating results from continuing operations and assets by business segment
Revenues	8,396	8,008	27,255	25,231
Operating Segments | North America
Summary of operating results from continuing operations and assets by business segment
Revenues	14,928	14,912	50,913	48,722
Elimination | Asia Pacific
Summary of operating results from continuing operations and assets by business segment
Revenues	10	6	(19)	(38)
Elimination | Europe
Summary of operating results from continuing operations and assets by business segment
Revenues	(18)	(62)	(97)	(317)
Elimination | North America
Summary of operating results from continuing operations and assets by business segment
Revenues	$ 8	$ 56	$ 116	$ 355

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Summary of segment reporting information profit loss.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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