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SIGNIFICANT ACCOUNTING POLICIES - Deferred revenue (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Deferred revenue - current $ 6,610 $ 7,125
Deferred revenue - noncurrent 29 73
Total deferred revenue $ 6,639 $ 7,198