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FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Cash equivalents:
Cash equivalents		$ 309,231
Short-term investments:
Short-term investments	$ 8,663	11,818
Total assets	443,934
Time deposits
Short-term investments:
Short-term investments	8,663	11,818
Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Cash equivalents:
Cash equivalents		260,582
Short-term investments:
Total assets	308,628
Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Time deposits
Short-term investments:
Short-term investments	0	0
Significant Other Observable Inputs (Level 2)
Cash equivalents:
Cash equivalents		48,649
Short-term investments:
Total assets	135,306
Significant Other Observable Inputs (Level 2) | Time deposits
Short-term investments:
Short-term investments	8,663	11,818
Money market funds
Cash equivalents:
Cash equivalents	308,628	260,582
Money market funds | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Cash equivalents:
Cash equivalents	308,628	260,582
Money market funds | Significant Other Observable Inputs (Level 2)
Cash equivalents:
Cash equivalents	0	0
Time deposits
Cash equivalents:
Cash equivalents	126,643	36,831
Time deposits | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Cash equivalents:
Cash equivalents	0	0
Time deposits | Significant Other Observable Inputs (Level 2)
Cash equivalents:
Cash equivalents	$ 126,643	$ 36,831

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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