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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Pronouncements (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Recently Adopted Pronouncements    
Other assets $ 145,441 $ 165,856
Other current liabilities 962,210 1,467,935
Other long-term liabilities $ 60,794 82,359
ASU 2016-02 | As Previously Reported    
Recently Adopted Pronouncements    
Other assets   2,849
Other current liabilities   1,387,287
ASU 2016-02 | New Lease Standard Adjustment    
Recently Adopted Pronouncements    
Other assets   163,007
Other current liabilities   80,648
Other long-term liabilities   $ 82,359