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FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Short-term investments:    
Short-term investments $ 9,240 $ 11,818
Total assets 137,091 309,231
Time deposits    
Short-term investments:    
Short-term investments 9,240 11,818
Quoted Market Prices in Active Markets for Identical Assets (Level 1)    
Short-term investments:    
Total assets 1,355 260,582
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)    
Short-term investments:    
Total assets 135,736 48,649
Significant Other Observable Inputs (Level 2) | Time deposits    
Short-term investments:    
Short-term investments 9,240 11,818
Money market funds    
Cash equivalents:    
Cash equivalents 1,355 260,582
Money market funds | Quoted Market Prices in Active Markets for Identical Assets (Level 1)    
Cash equivalents:    
Cash equivalents 1,355 260,582
Money market funds | Significant Other Observable Inputs (Level 2)    
Cash equivalents:    
Cash equivalents 0 0
Time deposits    
Cash equivalents:    
Cash equivalents 126,496 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 $ 126,496 $ 36,831