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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 28, 2016 | Jul. 23, 2012 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash and cash equivalents maturity period |  |  | three months or less |  |
Allowance for doubtful accounts |  |  | $ 139,000 | $ 84,000 | $ 77,000
Goodwill impairment loss |  |  | $ 0 |  |
License agreement, extended option term |  |  | 2 years |  |
License fee agreement, term of agreement |  |  | 5 years |  |
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%. |  |
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 |  |
Minimum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Recognized income tax positions measured at percentage of likelihood of realization |  |  | 50.00% |  |
Minimum [Member] | Other Intangible Assets [Member] | Adesis, Inc. [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  |  | 10 years |  |
Maximum [Member] | Other Intangible Assets [Member] | Adesis, Inc. [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  |  | 15 years |  |
Building [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life (in years) |  |  | 30 years |  |
Building Improvements [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life (in years) |  |  | 15 years |  |
Office, Lab Equipment and Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life (in years) |  |  | 3 years |  |
Office, Lab Equipment and Furniture and Fixtures [Member] | Maximum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life (in years) |  |  | 7 years |  |
Computer Software [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life (in years) |  |  | 3 years |  |

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