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Geographic areas and major customers (Percentage of Net Accounts Receivable Balance) (Details) - Accounts Receivable [Member]	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017
Customer 1 [Member]
Concentration Risk [Line Items]
Percentage of net accounts receivable	22.00%		15.00%
Customer 2 [Member]
Concentration Risk [Line Items]
Percentage of net accounts receivable	18.00%			[1]
Customer 3 [Member]
Concentration Risk [Line Items]
Percentage of net accounts receivable	10.00%			[1]
Customer 4 [Member]
Concentration Risk [Line Items]
Percentage of net accounts receivable		[1]	30.00%
Customer 5 [Member]
Concentration Risk [Line Items]
Percentage of net accounts receivable		[1]	22.00%
[1] Less than 10% of Trade accounts receivable, net.

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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

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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