Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Description of Business and Summary of Significant Accounting Policies (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 19,520,993 $ 13,673,308    
Restricted cash - current 88,174 40,075    
Restricted cash - long term 391,180 391,131    
Cash, cash equivalents and restricted cash $ 20,000,347 $ 14,104,514 $ 21,905,238 $ 17,790,576