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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Promissory note (Details) - USD ($)
Jun. 30, 2020
Jan. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Annual interest rate   6.00%  
Unpaid principal amount of the Note $ 337,457   $ 0
Promissory note      
Debt Instrument [Line Items]      
Principal amount $ 439,990 $ 439,990  
Annual interest rate 6.00%