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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 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
License agreement, extended option term |  |  |  |  | 2 years |  |
License fee agreement, term of agreement |  |  |  |  | 5 years |  |
Taxes, other |  |  | $ 65,000 | $ 35,000 | $ 120,000 | $ 64,000 |
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%. |  |
Operating lease, right-of-use asset |  |  | 8,800,000 |  | $ 8,800,000 |  |
Operating lease, liabilities |  |  | $ 8,788,000 |  | $ 8,788,000 |  |
Leases - ASU No. 2016-02 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  | $ 8,300,000
Operating lease, liabilities |  |  |  |  |  |  | $ 8,300,000
Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Recognized income tax positions measured at percentage of likelihood of realization |  |  |  |  | 50.00% |  |
Patents [Member] | FUJIFILM [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
OLED patents useful life |  | 10 years |  |  | 10 years |  |
Patents [Member] | BASF [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
OLED patents useful life | 10 years |  |  |  | 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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