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INCOME TAXES - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |  |
Effective income tax rate expense, percent | 15.30% | 18.90% | 15.80% | 15.00% |
Income tax expense (benefit) | $ 6,669,000 | $ 5,325,000 | $ 21,054,000 | $ 6,960,000 |
Deferred tax liability due to expiration of statute of limitations for 2015 federal tax return | 1,900,000 |  | 1,900,000 |  |
Long-term asset | 89,957,000 |  | 89,957,000 |  | $ 64,526,000
Korean Government [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  |  |  |  | (36,900,000)
U.S.Federal Government [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  |  |  |  | 16,200,000
KNTS [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax withholding and interest |  |  | 13,200,000 |  |
Reduction of Korean Withholding Taxes [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Reduction of deferred tax asset for foreign tax credits and R&D |  |  | 20,700,000 |  | 20,700,000
Allocation of Withholding to Non-Korean Patents [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Long-term asset | 23,500,000 |  | 23,500,000 |  | $ 13,600,000
ASU No. 2016-09 [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ 693,000 | $ 29,000 | $ 3,500,000 | $ 1,800,000 |

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