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GOODWILL AND INTANGIBLE ASSETS - Acquired Technology - Additional Information (Details) € in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 28, 2016 USD ($) patent | Jun. 28, 2016 EUR (€) patent | Jul. 23, 2012 USD ($) patent | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Amortization related to acquired technology |  |  |  |  |  | $ 16,474,000 | $ 16,469,000
Future amortization expense, 2020 |  |  |  | $ 5,200,000 |  | 5,200,000 |
Future amortization expense, 2021 |  |  |  | 20,600,000 |  | 20,600,000 |
Future amortization expense, 2022 |  |  |  | 15,800,000 |  | 15,800,000 |
Future amortization expense, 2023 |  |  |  | 9,700,000 |  | 9,700,000 |
Future amortization expense, 2024 |  |  |  | 9,600,000 |  | 9,600,000 |
Future amortization expense, thereafter |  |  |  | 14,500,000 |  | 14,500,000 |
Patent Technology [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Amortization related to acquired technology |  |  |  | $ 5,100,000 | $ 5,100,000 | $ 15,400,000 | $ 15,400,000
Patents [Member] | FUJIFILM [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Number of patents acquired (more than) | patent |  |  | 1,200 |  |  |  |
Assigned value of acquired intangible assets |  |  | $ 105,000,000.0 |  |  |  |
Cash paid for OLED patents |  |  | $ 4,500,000 |  |  |  |
OLED patents useful life |  |  | 10 years |  |  | 10 years |
Patents [Member] | BASF [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Number of patents acquired (more than) | patent | 500 | 500 |  |  |  |  |
Assigned value of acquired intangible assets | $ 95,800,000 | € 86.8 |  |  |  |  |
Cash paid for OLED patents | $ 217,000 |  |  |  |  |  |
OLED patents useful life | 10 years | 10 years |  |  |  | 10 years |

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