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ORGANIZATION AND BASIS OF PRESENTATION - Fair value on a recurring basis (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in related party $ 762 $ 510
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in related party $ 762 $ 510