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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
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 $ 673,000 $ 395,000     $ 920,000 $ 2,300,000
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