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SIGNIFICANT ACCOUNTING POLICIES - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 7,801,875 $ 4,947,801    
Restricted cash 1,089,060 1,292,687    
Cash Cash Equivalents And Restricted Cash $ 8,890,935 $ 6,240,488 $ 9,904,316 $ 8,752,860