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FAIR VALUE MEASUREMENTS - EQUITY INVESTMENT (Details) - Equity Investment - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2007
Equity Investments [Line Item]          
Number of shares owned         13,842,625
Cost method investments cost basis         $ 0
Fair value of equity investment $ 373,000   $ 373,000    
Increase (decrease) in fair value of equity investment (195,000) $ 205,000 (195,000) $ (270,000)  
Gain (loss) related to foreign currency translation $ (14,000) $ (30,000) $ (17,000) $ (68,000)  
Maximum          
Equity Investments [Line Item]          
Cost method investments Ownership         20.00%