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INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |  |  |  |
Effective income tax rate (benefit) expense, percent |  | (18.50%) | 15.30% | 17.90% | 15.80% |  |
Income tax expense (benefit) |  | $ 9,217 | $ 6,669 | $ 17,355 | $ 21,054 |  |
Long-term asset |  | 103,067 |  | $ 103,067 |  | $ 86,090 |
Withholding and interest for licencing and royalty payments | $ 13,200 |  |  |  |  |  |
Withholding and interest for licencing and royalty payments period | 3 years |  |  |  |  |  |
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 |
U.S.Federal Government [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  |  |  |  |  |  | $ 16,200
Korean Government [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  |  |  |  |  |  | $ (36,900)
Allocation of Withholding to Non-Korean Patents [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Long-term asset |  | 36,700 |  | 36,700 |  | 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 |  | 35,500 |  | 35,500 |  | $ 25,700 |
ASU No. 2016-09 [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) |  | $ 308,000,000 | $ 693,000,000 | $ 1,900 | $ 3,500 |  |

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