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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)						12 Months Ended
	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