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LONG-TERM INVESTMENTS - Available-for-sale security (Details) - Beijing Borderless - USD ($)
$ in Thousands
12 Months Ended
Jun. 25, 2018
Dec. 31, 2018
AVAILABLE-FOR-SALE SECURITY    
Equity method investments, ownership percentage 20.00%  
Equity method investments, cash consideration $ 436  
Unrealized holding gains or losses   $ 0
Impairment   $ 0