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SIGNIFICANT ACCOUNTING POLICIES - Share based compensation expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses $ 11,380 $ 15,122 $ 14,164
Cost of revenues      
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses 388 425 411
Research and development expenses, net      
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses 2,685 3,481 2,772
Selling and marketing expenses      
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses 4,297 6,032 6,170
General and administrative expenses      
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses $ 4,010 $ 5,184 $ 4,811