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FAIR VALUE MEASUREMENTS - The Group's financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Financial investments $ 16,500,000  
Financial investments 16,500  
Total financial net assets (16,500,000)  
Fair Value, Measurements, Recurring    
Marketable securities 78,066,000 $ 89,976,000
Financial assets related to foreign currency derivative hedging contracts (5,143,000) (812,000)
Total financial net assets (72,923,000) 90,788,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Marketable securities 78,066,000 89,976,000
Financial assets related to foreign currency derivative hedging contracts (5,143,000) (812,000)
Total financial net assets (72,923,000) $ 90,788,000
NAV    
Financial investments 16,500,000  
Total financial net assets $ (16,500,000)