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Description of Business and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of cash and cash equivalent and restricted cash
   June 30,
2019		   December 31,
2018		 
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 
Schedule of antidilutive securities excluded from computation of diluted net loss per share
   June 30,
2019		   June 30,
2018		 
Options   7,931,861    5,800,742 
Warrants   86,335,713    56,015,610 
Total   94,267,574    61,816,352