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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES (Customer and Credit Risk Concentration) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) customers | Dec. 31, 2016 USD ($) customers | Dec. 31, 2015 USD ($) customers
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES | $ | $ 108,249 | $ 111,255 | $ 107,563 | $ 104,688 | $ 102,436 | $ 101,625 | $ 97,571 | $ 88,036 | $ 431,755 | $ 389,668 | $ 344,609
Distributors [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET REVENUES | $ |  |  |  |  |  |  |  |  | $ 330,900 | $ 292,600 | $ 261,400
Credit Concentration Risk | Accounts Receivable |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage benchmark for total accounts receivable | 10.00% |  |  |  | 10.00% |  |  |  | 10.00% | 10.00% |
Number of major customers | customers |  |  |  |  |  |  |  |  | 10 | 10 |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 64.00% | 70.00% |
Credit Concentration Risk | Accounts Receivable | Avnet |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 18.00% | 24.00% |
Customer Concentration Risk | Net Revenues |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of major customers | customers |  |  |  |  |  |  |  |  | 10 | 10 | 10
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00%
Concentration risk percentage of net revenue |  |  |  |  |  |  |  |  | 54.00% | 60.00% | 61.00%
Customer Concentration Risk | Net Revenues | Avnet |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage of net revenue |  |  |  |  |  |  |  |  | 16.00% | 18.00% | 21.00%
Customer Concentration Risk | Net Revenues | Powertech Distribution Ltd. |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage of net revenue |  |  |  |  |  |  |  |  |  | 10.00% | 11.00%

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