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INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |
Long-term asset |  | $ 103,341 | $ 86,090 |
Withholding and interest for licencing and royalty payments | $ 13,200 |  |  |
Withholding and interest for licencing and royalty payments period | 3 years |  |  |
Current income tax expense |  | $ 19,262 | 16,514 | $ 8,677
State and foreign income tax returns subject to examination period minimum (in years) |  | 3 years |  |
State and foreign income tax returns subject to examination period maximum (in years) |  | 4 years |  |
Reduction of Korean Withholding Taxes [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Reduction of deferred tax asset for foreign tax credits and R&D |  | $ 20,700 | 20,700 |
Korean Government [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  | (36,900) |  |
U.S.Federal Government [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  | 16,200 |  |
South Korea [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Current income tax expense |  | 14,900 | 14,900 | $ 14,900
Allocation of Withholding to Non-Korean Patents [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Long-term asset |  | 40,100 | 26,900 |
Allocation of Withholding to Non-Korean Patents [Member] | U.S.Federal Government [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  | $ 32,700 | $ 25,700 |

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