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INFORMATION ON GEOGRAPHIC AREAS AND MAJOR CUSTOMERS (Schedule of Revenues of Major Customers) (Details) - Revenue [Member] | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Customer A [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage |  | 30.00% | 35.00% | 40.00%
Customer B [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage |  | 12.00% | 12.00% | 13.00%
Customer C [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage | [1] | 15.00% | 14.00% | 6.00%
Customer One [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage |  | 8.00% | 5.00% | 6.00%
Customer Two [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage |  | 7.00% | 9.00% |
[1] | Represents sales to two customers accounted for 7% and 8% of sales during 2017, to two customers accounted for 5% and 9% of sales during 2016 and to one customer accounted for 6% during 2015.

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