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ACCRUED EXPENSES (Tables) | 9 Months Ended
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Sep. 30, 2023
Payables and Accruals [Abstract] |
Accrued Expenses | Accrued expenses consist of the following (in thousands):
|  | September 30, 2023 |  |  | December 31, 2022 |
Compensation |  | $ | 22,685 |  |  | $ | 31,751 |
PPG Industries, Inc. agreement |  |  | 6,090 |  |  |  | 9,864 |
Consulting |  |  | 1,832 |  |  |  | 910 |
Professional fees |  |  | 1,049 |  |  |  | 906 |
Research and development agreements |  |  | 513 |  |  |  | 662 |
Royalties |  |  | 414 |  |  |  | 877 |
Other |  |  | 5,917 |  |  |  | 6,032 |
Accrued expenses |  | $ | 38,500 |  |  | $ | 51,002 |

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