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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 | Mar. 09, 2011 | Sep. 30, 2018 USD ($) patent | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) patent | Sep. 30, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Amortization related to acquired technology |  |  |  |  |  |  | $ 16,479,000 | $ 16,485,000
Future amortization expense, remainder of 2018 |  |  |  |  | $ 20,600,000 |  | 20,600,000 |
Future amortization expense, 2019 |  |  |  |  | 20,500,000 |  | 20,500,000 |
Future amortization expense, 2020 |  |  |  |  | 20,500,000 |  | 20,500,000 |
Future amortization expense, 2021 |  |  |  |  | 20,500,000 |  | 20,500,000 |
Future amortization expense, 2022 |  |  |  |  | 15,800,000 |  | 15,800,000 |
Future amortization expense, thereafter |  |  |  |  | 33,600,000 |  | 33,600,000 |
Patent Technology [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Amortization related to acquired technology |  |  |  |  | $ 5,100,000 | $ 5,100,000 | $ 15,400,000 | $ 15,500,000
Licensing Agreements [Member] | Motorola [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Number of patents under license agreement | patent |  |  |  |  | 74 |  | 74 |
Amortization period of acquired intangible assets (in years) |  |  |  | 7 years 6 months |  |  |  |
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 |  |  |  |  |
Cash paid for OLED patents |  |  | $ 4,500,000 |  |  |  |  |
OLED patents useful life |  |  | 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 |  |  |  |  |  |

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