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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Cash and Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value disclosure |  |
Cash and cash equivalents | $ 187,286 | $ 158,264
Short-term investments | 153,116 | 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 | 118,900 | 87,600
Cash deposits |  |
Fair value disclosure |  |
Cash and cash equivalents | 161,176 | 137,247
Variable rate demand notes |  |
Fair value disclosure |  |
Cash and cash equivalents | 122 | 9,285
Money market funds |  |
Fair value disclosure |  |
Cash and cash equivalents | 25,988 | 11,732
Certificates of deposit |  |
Fair value disclosure |  |
Short-term investments | 113,542 | 88,851
U.S. Treasury securities |  |
Fair value disclosure |  |
Short-term investments | $ 39,574 | $ 78,811

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