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Geographic areas and major customers (Percentage of Net Accounts Receivable Balance) (Details) - Accounts Receivable [Member] | 12 Months Ended
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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 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 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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