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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 22, 2011 Research and Development Arrangement [Member] | Oct. 01, 2000 Research and Development Arrangement [Member] | Oct. 01, 2000 Inventories [Member] | Sep. 30, 2014 New OLED Materials Agreement and OLED Materials Agreement [Member] | Sep. 30, 2013 New OLED Materials Agreement and OLED Materials Agreement [Member] | Sep. 30, 2014 New OLED Materials Agreement and OLED Materials Agreement [Member] | Sep. 30, 2013 New OLED Materials Agreement and OLED Materials Agreement [Member] | Sep. 22, 2011 Universal Display Corporation [Member] Research and Development Arrangement [Member] | Sep. 22, 2011 PPG Industries [Member] Research and Development Arrangement [Member]
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment, Agreement Period |  |  |  |  |  | 5 years | 7 years |  |  |  |  |  |
Long term purchase commitment, renewal period |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Long-Term Purchase Commitment, period of notice needed to terminate contract |  |  |  |  |  |  |  |  |  |  |  | 1 year | 2 years
Percent Of Services Payable In Cash Or Shares | 50.00% |  | 50.00% |  |  |  |  |  |  |  |  |  |
Minimum average closing price of common stock (in dollars per share) |  |  |  |  |  |  |  | $ 20.00 |  | $ 20.00 |  |  |
Issuance of common stock in connection with materials and license agreements (in shares) | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
Charges to expense for cash portion of reimbursement of expenses |  |  |  |  |  |  |  | $ 378 | $ 1,600 | $ 7,500 | $ 4,900 |  |

X
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X
- Definition Number of new stock issued during the period in connection with materials and license agreements. + References No definition available. + Details
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- Definition Long-term Purchase Commitment, Agreement Period + References No definition available. + Details
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- Definition Long-Term Purchase Commitment, Percent Of Services Payable In Cash Or Shares + References No definition available. + Details
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- Definition Long-Term Purchase Commitment, period of notice needed to terminate contract + References No definition available. + Details
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- Definition Long term purchase commitment, renewal period + References No definition available. + Details
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- Definition The minimum average closing price of the Company's common stock during a specified number of days prior to the end of each calendar half-year period ending on March 31 and September 30. If the average closing price is less than this amount, the Company is required to compensate PPG Industries in cash. + References No definition available. + Details
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X
- Details
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