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LEASES - Future minimum payments (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Future minimum payments under non-cancelable operating leases and financing leases    
Remainder of 2019 $ 42,872  
2020 84,155  
Total 127,027  
Less imputed interest 3,931  
Total $ 123,096 $ 163,007