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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2015
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
New OLED Materials Agreement and OLED Materials Agreement [Member] | Cash Distribution |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Charges to expense for cash portion of reimbursement of expenses | $ 1.0 | $ 1.5 | $ 1.9 |  |  | $ 3.0
New OLED Materials Agreement and OLED Materials Agreement [Member] | Weighted Average |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Minimum average closing price of common stock (in dollars per share) |  |  |  | $ 20.00 | $ 20.00 |

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