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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Customer and Credit Risk Concentration (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) Customer | Mar. 31, 2018 USD ($) Customer | Dec. 31, 2018 Customer
Concentration Risk [Line Items] |  |  |
NET REVENUES | $ | $ 89,188 | $ 103,081 |
Distributors [Member] |  |  |
Concentration Risk [Line Items] |  |  |
NET REVENUES | $ | $ 69,800 | $ 79,100 |
Sales Revenue, Goods, Net | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Number of major customers | 1 | 1 |
Concentration risk percentage benchmark | 10.00% | 10.00% |
Sales Revenue, Goods, Net | Customer Concentration Risk [Member] | Avnet |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total net revenues | 13.00% | 16.00% |
Sales Revenue, Goods, Net | Customer Concentration Risk [Member] | Ten Customers |  |  |
Concentration Risk [Line Items] |  |  |
Number of major customers | 10 | 10 |
Concentration risk, percentage of total net revenues | 52.00% | 58.00% |
Accounts Receivable [Member] | Credit Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Number of major customers | 10 |  | 10
Concentration risk percentage benchmark for accounts receivable (more than) | 10.00% |  | 10.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Avnet |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage benchmark | 18.00% |  | 17.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Powertech Distribution Ltd. |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage benchmark | 11.00% |  | 11.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Ten Customers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage benchmark | 68.00% |  | 64.00%

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