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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
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 | $ 789,000 | $ 821,000 | $ 3,000,000.0 | $ 2,100,000
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 | $ 20.00 | $ 20.00

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