FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Cash and Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair value disclosure
Cash and cash equivalents	$ 251,503	$ 158,264
Short-term investments	89,326	167,662
Concentrations of Credit Risk of Financial Instruments
Cash deposits and short-term investments which were neither FDIC insured nor direct obligations of the U.S. government	70,200	87,600
Cash deposits
Fair value disclosure
Cash and cash equivalents	160,671	137,247
Variable rate demand notes
Fair value disclosure
Cash and cash equivalents		9,285
Money market funds
Fair value disclosure
Cash and cash equivalents	90,832	11,732
Certificates of deposit
Fair value disclosure
Short-term investments	69,421	88,851
U.S. Treasury securities
Fair value disclosure
Short-term investments	$ 19,905	$ 78,811