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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, Restricted Cash (Details) - USD ($)
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash, Cash equivalents and Restricted Cash [Abstract]        
Cash and cash equivalents $ 12,465,483 $ 3,393,186 $ 4,594,007  
Restricted cash 541,062 0 0  
Total cash, cash equivalents, and restricted cash $ 13,006,545 $ 3,393,186 $ 4,594,007 $ 7,427,273