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 | |||