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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Mar. 31, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Long-term Purchase Commitment [Line Items]          
Percent of services payable in cash or shares     50.00%    
Issuance of common stock in connection with materials and license agreements (in shares)     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     $ 1.7 $ 2.3 $ 7.9
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