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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) |  |  |  |  |  | 12 Months Ended
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Feb. 13, 2018 | Jan. 02, 2017 | Jun. 28, 2016 | Jul. 23, 2012 | Mar. 09, 2011 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents maturity period |  |  |  |  |  | three months or less |  |
Allowance for doubtful accounts |  |  |  |  |  | $ 0 | $ 100,000 | $ 0
Goodwill impairment loss |  |  |  |  |  | $ 0 |  |
License fee agreement, term of agreement |  |  |  |  |  | 6 years 4 months 24 days |  |
Taxes, other |  |  |  |  |  | $ 409,000 | 171,000 | 1,300,000
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 |  |  |  |  |  | $ 8,402,000 | $ 3,360,000 | $ 48,812,000
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 |  |  |  |  |  | 21,000,000 |  |
Unbilled receivables |  |  |  |  |  | $ 300,000 |  |
ASU No. 2016-09 [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Deferred tax asset and offsetting credit to retained earnings |  | $ 26,500,000 |  |  |  |  |  |
OLED Technology License Agreement [Member] | Tianma [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Agreement effective date |  |  |  |  |  |  | Jul. 21, 2016 |
Agreement period |  |  |  |  |  |  | 5 years |
Supplemental Material Purchase Agreement [Member] | Tianma [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Agreement effective date |  |  |  |  |  |  | Jul. 21, 2016 |
Agreement period |  |  |  |  |  |  | 5 years |
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 |  |  |  |  |
Patents [Member] | OLED Technology License Agreement and Supplemental Material Purchase Agreement [Member] | Samsung Display Co., Ltd [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Agreement expiration date |  |  |  |  |  | Dec. 31, 2017 |  |
Patents [Member] | OLED Technology License Agreement and Supplemental Material Purchase Agreement [Member] | Samsung Display Co., Ltd [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
License agreement, extended term | 5 years |  |  |  |  |  |  |
License agreement, extended option term | 2 years |  |  |  |  |  |  |
Agreement effective date | Jan. 01, 2018 |  |  |  |  |  |  |
Licensing Agreements [Member] | Motorola [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Amortization period of acquired intangible assets (in years) |  |  |  |  | 7 years 6 months |  |  |
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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