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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Pronouncements (Details) - USD ($)
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Recently Adopted Pronouncements      
Other assets $ 124,820   $ 165,856
ASU 2016-02 | New Lease Standard Adjustment      
Recently Adopted Pronouncements      
Other assets   $ 163,007