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CONCENTRATION OF RISK - Revenues and Accounts Receivable From Our Largest Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Concentration Risk [Line Items] |  |  |  |  |
Accounts Receivable | $ 96,235 |  | $ 96,235 |  | $ 82,261
Major Customer A [Member] | Total Revenue [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
% of Total Revenue | 50.00% | 41.00% | 46.00% | 38.00% |
Major Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Accounts Receivable | $ 10,129 |  | $ 10,129 |  |
Major Customer B [Member] | Total Revenue [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
% of Total Revenue | 27.00% | 28.00% | 25.00% | 28.00% |
Major Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Accounts Receivable | $ 23,786 |  | $ 23,786 |  |
Major Customer C [Member] | Total Revenue [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
% of Total Revenue | 7.00% | 14.00% | 14.00% | 17.00% |
Major Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Accounts Receivable | $ 33,520 |  | $ 33,520 |  |

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