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SIGNIFICANT ACCOUNTING POLICIES - Share based compensation expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses $ 8,228 $ 11,380 $ 15,122
Cost of revenues      
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses 369 388 425
Research and development expenses, net      
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses 2,108 2,685 3,481
Selling and marketing expenses      
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses 2,959 4,297 6,032
General and administrative expenses      
SIGNIFICANT ACCOUNTING POLICIES      
Total share-based compensation expenses $ 2,792 $ 4,010 $ 5,184