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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 129,660 | $ 57,968 | $ 263,660 | $ 170,245
South Korea [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 86,324 | 31,062 | 154,299 | 100,487
China [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 36,308 | 20,508 | 96,812 | 58,342
Japan [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 2,001 | 2,197 | 3,316 | 3,984
Other Non-U.S. Locations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 895 | 315 | 1,720 | 812
Total Non-U.S. Locations [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | 125,528 | 54,082 | 256,147 | 163,625
United States [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues | $ 4,132 | $ 3,886 | $ 7,513 | $ 6,620

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