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Net Loss per Share (Tables)
9 Months Ended
Sep. 30, 2019
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, 2019 and 2018 consisted of the following:
 
   September 30, 
   2019  2018 
Stock options
  4,995,549   4,569,468 
Inducement stock options
  965,000   —   
Unvested restricted stock
   1,569,579   1,164,352 
Warrants
   18,939,394   —   
Preferred stock
   —     52,583,921 
   
 
 
   
 
 
 
    
 
 
 
 
26,469,522   
 
 
 
 
 
58,317,741