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FINANCIAL INSTRUMENTS - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cash equivalents: |  |
Cash equivalents | $ 197,615 | $ 180,865
Level 1 |  |
Cash equivalents: |  |
Cash equivalents | 147,615 | 150,865
Level 2 |  |
Cash equivalents: |  |
Cash equivalents | 50,000 | 30,000
Money market funds |  |
Cash equivalents: |  |
Cash equivalents | 147,615 | 150,865
Money market funds | Level 1 |  |
Cash equivalents: |  |
Cash equivalents | 147,615 | 150,865
Money market funds | Level 2 |  |
Cash equivalents: |  |
Cash equivalents | 0 | 0
Time deposits |  |
Cash equivalents: |  |
Cash equivalents | 50,000 | 30,000
Time deposits | Level 1 |  |
Cash equivalents: |  |
Cash equivalents | 0 | 0
Time deposits | Level 2 |  |
Cash equivalents: |  |
Cash equivalents | $ 50,000 | $ 30,000

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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