ACCRUED EXPENSES (Tables)

3 Months Ended

Mar. 31, 2023

Payables and Accruals [Abstract]

Accrued Expenses

Accrued expenses consist of the following (in thousands):

	March 31, 2023		December 31, 2022
Compensation	$	12,525	$	31,751
PPG Industries, Inc. agreement		4,335		9,864
Consulting		1,361		910
Royalties		1,017		877
Professional fees		785		906
Research and development agreements		683		662
Other		4,640		6,032
Accrued expenses	$	25,346	$	51,002