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INTANGIBLE ASSETS, NET - Expected amortization expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
INTANGIBLE ASSETS, NET    
2020 $ 332  
2021 284  
2022 272  
2023 13  
Finite-Lived Intangible Assets, Net $ 901 $ 1,253