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CONCENTRATION OF RISK - Revenues and Accounts Receivable From Our Largest Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |
Accounts Receivable | $ 82,261 | $ 60,452 |
Major Customer A [Member] | Total Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
% of Total Revenue | 41.00% | 44.00% | 37.00%
Major Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Accounts Receivable | $ 20,476 | $ 13,830 | $ 14,419
Major Customer B [Member] | Total Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
% of Total Revenue | 30.00% | 27.00% | 33.00%
Major Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Accounts Receivable | $ 26,776 | $ 19,346 | $ 11,990
Major Customer C [Member] | Total Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
% of Total Revenue | 13.00% | 15.00% | 10.00%
Major Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Accounts Receivable | $ 2,757 | $ 10,592 | $ 9,071

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