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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |
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Jun. 28, 2016 | Jul. 23, 2012 | Mar. 09, 2011 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
License agreement, extended option term |  |  |  |  |  | 2 years |  |
License fee agreement, term of agreement |  |  |  |  |  | 5 years |  |
Taxes, other |  |  |  | $ 35,000 | $ 97,000 | $ 64,000 | $ 304,000 |
Recognized income tax positions measured at likelihood of realization description |  |  |  |  |  | Recognized income tax positions are measured at the largest amount of which the likelihood of realization is greater than 50%. |  |
Increase in deferred revenue |  |  |  |  |  | $ 99,940,000 | 1,863,000 |
Deferred revenue offset by reduction of retained earnings |  |  |  |  |  |  |  | $ (17,894,000)
Revenues |  |  |  | 77,550,000 | $ 61,683,000 | 177,271,000 | $ 219,762,000 |
Revenue from Contracts with Customers - ASU No. 2014-09 [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Increase in deferred revenue |  |  |  |  |  | 21,300,000 |  |
Deferred revenue offset by reduction of retained earnings |  |  |  | 17,900,000 |  | 17,900,000 |  |
Deferred revenue offset by reduction of retained earnings, tax amount |  |  |  |  |  | 3,100,000 |  |
Unbilled receivables |  |  |  | 300,000 |  | 300,000 |  |
Revenues |  |  |  | $ 14,100,000 |  | $ 56,200,000 |  |
Minimum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Recognized income tax positions measured at percentage of likelihood of realization |  |  |  |  |  | 50.00% |  |
Licensing Agreements [Member] | Motorola [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  |  | 7 years 6 months |  |  |  |  |
Patents [Member] | FUJIFILM [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
OLED patents useful life |  | 10 years |  |  |  |  |  |
Patents [Member] | BASF [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
OLED patents useful life | 10 years |  |  |  |  |  |  |
Other Intangible Assets [Member] | Adesis, Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  |  |  |  |  | 10 years |  |
Other Intangible Assets [Member] | Adesis, Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  |  |  |  |  | 15 years |  |

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