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