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EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS - Additional Information (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Percent of services payable in cash or shares |  |  | 50.00% |  |
Issuance of common stock in connection with materials and license agreements (in shares) |  |  | 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 |  |  | $ 2,800,000 | $ 1,400,000 | $ 771,000
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 |  |  |

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