Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Description of Business and Summary of Significant Accounting Policies (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 9,924,882 $ 13,673,308    
Restricted cash - current 40,105 40,075    
Restricted cash - long term 391,180 391,131    
Cash, cash equivalent and restricted cash $ 10,356,167 $ 14,104,514 $ 27,194,480 $ 17,790,576