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FAIR VALUE MEASUREMENTS - EQUITY INVESTMENT (Details) - Equity Investment - USD ($)
12 Months Ended
Aug. 03, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2007
Equity Investments [Line Item]          
Number of shares owned         13,842,625
Cost method investments cost basis       $ 0 $ 0
Trading restriction period 24 months        
Fair value of equity investment   $ 389,000      
Increase (decrease) in fair value of equity investment   (195,000) $ (541,000)    
Gain (loss) related to foreign currency translation   $ (1,000) $ (63,000)