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INCOME TAXES - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |  |
Effective income tax rate expense, percent |  | 18.60% | 16.00% |  |
Income tax expense (benefit) |  | $ 8,700,000 | $ 5,999,000 |  |
Long-term asset |  | $ 89,335,000 |  | $ 86,090,000 |
Withholding and interest for licencing and royalty payments | $ 13,200,000 |  |  |  |
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 |  | $ 20,700,000 |  | 20,700,000 |
U.S.Federal Government [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  |  |  |  | $ 16,200,000
Korean Government [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  |  |  |  | $ (36,900,000)
Allocation of Withholding to Non-Korean Patents [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Long-term asset |  | 30,200,000 |  | 26,900,000 |
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 |  | 29,000,000.0 |  | $ 25,700,000 |
ASU No. 2016-09 [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ 450,000 | $ 1,500,000 |  |

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