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FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Cash equivalents: |  |
Cash equivalents |  | $ 197,615
Short-term investments: |  |
Short-term investments | $ 12,453 | 0
Total assets | 14,506 |
Time deposits |  |
Short-term investments: |  |
Short-term investments | 12,453 |
Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Cash equivalents: |  |
Cash equivalents |  | 147,615
Short-term investments: |  |
Total assets | 2,053 |
Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Time deposits |  |
Short-term investments: |  |
Short-term investments | 0 |
Significant Other Observable Inputs (Level 2) |  |
Cash equivalents: |  |
Cash equivalents |  | 50,000
Short-term investments: |  |
Total assets | 12,453 |
Significant Other Observable Inputs (Level 2) | Time deposits |  |
Short-term investments: |  |
Short-term investments | 12,453 |
Money market funds |  |
Cash equivalents: |  |
Cash equivalents | 2,053 | 147,615
Money market funds | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Cash equivalents: |  |
Cash equivalents | 2,053 | 147,615
Money market funds | Significant Other Observable Inputs (Level 2) |  |
Cash equivalents: |  |
Cash equivalents | $ 0 | 0
Time deposits |  |
Cash equivalents: |  |
Cash equivalents |  | 50,000
Time deposits | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Cash equivalents: |  |
Cash equivalents |  | 0
Time deposits | Significant Other Observable Inputs (Level 2) |  |
Cash equivalents: |  |
Cash equivalents |  | $ 50,000

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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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