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Description of Business and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of cash and cash equivalent and restricted cash
   September 30,
2019		   December 31,
2018		   September 30,
2018		 
Cash and cash equivalents  $14,312,909   $13,673,308   $14,805,472 
Restricted cash – current   48,056    40,075    40,055 
Restricted cash – long-term   391,180    391,131    390,940 
Cash, cash equivalents and restricted cash  $14,752,145   $14,104,514   $15,236,467 
Schedule of antidilutive securities excluded from computation of diluted net loss per share
   September 30,
2019		   September 30,
2018		 
Options   11,931,801    7,668,231 
Warrants   86,335,713    56,013,474 
Total   98,267,514    63,681,705