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Net Loss per Share (Tables)
6 Months Ended
Jun. 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 June 30, 2019 and 2018 consisted of the following:
  June 30, 
  2019  2018 
Stock options
  5,077,591   4,303,802 
Inducement stock options
  500,000   —   
Unvested restricted stock
  1,554,579   1,198,868 
Warrants
  18,939,394   —   
Preferred stock
  —     41,754,054 
  
 
 
  
 
 
 
   26,071,564   47,256,724