ACCRUED EXPENSES (Tables)

3 Months Ended

Mar. 31, 2022

Payables and Accruals [Abstract]

Accrued Expenses

Accrued expenses consist of the following (in thousands):

	March 31, 2022		December 31, 2021
Compensation	$	12,997	$	27,686
PPG agreements		6,705		8,853
Research and development agreements		1,746		1,469
Professional fees		1,432		1,000
Consulting		645		1,314
Royalties		154		691
Other		3,281		4,461
Accrued expenses	$	26,960	$	45,474