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Net Loss per Share (Tables)
9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Potential Dilutive Shares Excluded from Computation of Diluted Net Loss Per Share Such potentially dilutive shares of common stock at September 30, 2020 and 2019 consisted of the following:
 
     September 30,  
     2020      2019  
Stock options
     6,572,191        4,995,549  
Inducement stock options
     863,333        965,000  
Unvested restricted stock
     1,289,389        1,569,579  
Warrants
     22,272,727        18,939,394  
  
 
 
    
 
 
 
     30,997,640        26,469,522