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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
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  
Charges to expense for cash portion of reimbursement of expenses $ 1.5 $ 2.6 $ 6.1 $ 4.9
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