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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 01, 2011 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Percent Of Services Payable In Cash Or Shares |  | 50.00% |  | 50.00% |
Issuance of common stock in connection with materials and license agreements (in shares) |  | 0 | 0 | 0 | 0
Research and development expense, cash portion, excluding amounts paid for commercial chemicals |  | $ 11,434 | $ 7,915 | $ 32,000 | $ 28,639
New OLED Materials Agreement and OLED Materials Agreement [Member] |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
New OLED Materials Agreement, automatic renewal term | 1 year |  |  |  |
New OLED Materials Agreement, termination notice period | 1 year |  |  |  |
Minimum average closing price of common stock (in dollars per share) |  | $ 20.00 |  | $ 20.00 |
Research and development expense, cash portion, excluding amounts paid for commercial chemicals |  | $ 2,700 | $ 378 | $ 5,700 | $ 7,500
PPG Industries [Member] | New OLED Materials Agreement and OLED Materials Agreement [Member] |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
New OLED Materials Agreement, termination notice period | 2 years |  |  |  |

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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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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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