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SIGNIFICANT CUSTOMER INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Revenue, Major Customer [Line Items] |  |  |  |  |
Sales, net | $ 389,521 | $ 175,127 | $ 1,044,857 | $ 450,680 |
Product [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Sales, net | 358,257 | 148,138 | 959,388 | 366,443 |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Applied Materials, Inc. [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Sales, net | $ 65,740 | $ 38,957 | $ 181,129 | $ 108,978 |
Significant concentration risk, 10% or more of total balance | 16.90% | 22.20% | 17.30% | 24.20% |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Lam Research [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Sales, net | $ 40,798 | $ 21,991 |  | $ 61,364 |
Significant concentration risk, 10% or more of total balance | 10.50% | 12.60% |  | 13.60% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Applied Materials, Inc. [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Significant concentration risk, 10% or more of total balance |  |  | 16.20% |  | 14.90%
Accounts receivable | $ 39,015 |  | $ 39,015 |  | $ 36,849
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Nidec Motor Corporation [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Significant concentration risk, 10% or more of total balance |  |  |  |  | 15.40%
Accounts receivable |  |  |  |  | $ 38,071

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