The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information".

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Investments, Amortized Cost Basis

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- Definition

The term (in years) of the specified research and development agreement.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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-SubTopic 10

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-Subparagraph (SX 210.5-02.2)

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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-Name Accounting Standards Codification

-Glossary Cash

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	0 Months Ended
	Jul. 13, 2012	Jul. 17, 2012	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Short-term investments, Amortized Cost			$ 246,171,000oled_InvestmentsAmortizedCostBasis	$ 209,470,000oled_InvestmentsAmortizedCostBasis
Short-term investments, Unrealized Gains			18,000oled_InvestmentsGrossUnrealizedGains	35,000oled_InvestmentsGrossUnrealizedGains
Short-term investments, Unrealized Losses			(54,000)oled_InvestmentsGrossUnrealizedLosses	(64,000)oled_InvestmentsGrossUnrealizedLosses
Investments			246,135,000us-gaap_Investments	209,441,000us-gaap_Investments
Plextronics, Inc. [Member]
Schedule of Available-for-sale Securities [Line Items]
Joint development, term of agreement (in years)	3 years
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents, Amortized Cost			11,373,000	11,358,000
Cash equivalents, Unrealized Gains			4,000	2,000
Cash equivalents, Unrealized Losses			(13,000)	(16,000)
Cash equivalents, Aggregate Fair Market Value			11,364,000	11,344,000
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized Cost			228,799,000	190,738,000
Available-for-sale debt securities, Unrealized Gains			14,000	33,000
Available-for-sale debt securities, Unrealized Losses			41,000	48,000
Available-for-sale Securities, Fair Value Disclosure			228,772,000	190,723,000
U.S. Government bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized Cost			5,999,000	3,074,000
Available-for-sale debt securities, Unrealized Gains			0	0
Available-for-sale debt securities, Unrealized Losses			0	0
Available-for-sale Securities, Fair Value Disclosure			5,999,000	3,074,000
Convertible notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized Cost				4,300,000
Available-for-sale debt securities, Unrealized Gains				0
Available-for-sale debt securities, Unrealized Losses				0
Available-for-sale Securities, Fair Value Disclosure				4,300,000
Convertible notes [Member] \| Plextronics, Inc. [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized Cost	4,000,000
Convertible promissory note stated interest rate	3.00%
Convertible notes [Member] \| Private Company [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Amortized Cost		$ 300,000
Convertible promissory note stated interest rate		5.00%