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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 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 | $ 2,600,000 | $ 796,000 | $ 4,600,000 | $ 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 |

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