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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Sep. 30, 2019
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    
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 $ 473,000 $ 74,000    
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