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Loan Payable Under Credit Agreement (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Mar. 06, 2015
Loan Payable Under Credit Agreement (Textual)            
Interest expense $ 1,061,827 $ 504,392 $ 3,040,832 $ 1,611,687    
Repayment of loans payable     9,786,487 2,288,207    
Unamortized issuance costs 151,634   151,634   $ 39,468  
Credit Agreement [Member]            
Loan Payable Under Credit Agreement (Textual)            
Borrowed from lender           $ 25,000,000
Interest expense 689,667 $ 385,989 2,103,891 $ 1,256,475    
Funded amount 14,558,383   14,558,383      
Repayment of loans payable     3,365,635      
Unamortized issuance costs $ 353,813   $ 353,813