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Geographic areas and major customers (Sales By Geographic Region) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales attributable based on geographic location	[1]	$ 125,690	$ 100,347	$ 82,738
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales attributable based on geographic location		100,434	65,590	54,537
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales attributable based on geographic location		20,156	24,208	16,331
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales attributable based on geographic location		$ 5,100	$ 10,549	$ 11,870
[1] Including sales to related parties in the amount of US$ 1,154 thousand, US$ 762 thousand and US$ 1,275 thousand in 2015, 2016 and 2017, respectively.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales 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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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