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FAIR VALUE MEASUREMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
FAIR VALUE MEASUREMENT      
Impairment loss on intangible assets $ 0 $ 0 $ 0
Impairment loss on long-term equity method investment $ 0 $ 0 $ 0