Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Summary of Significant Accounting Policies (Details 2)

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Description of Business and Summary of Significant Accounting Policies (Details 2) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 14,805,472 $ 17,399,636 $ 20,541,955  
Restricted cash - current 40,055  
Restricted cash 390,940 390,940 390,874  
Cash and cash equivalent and restricted cash $ 15,236,467 $ 17,790,576 $ 20,932,829 $ 20,554,027