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Net Loss per Share (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2020 and 2019 consisted of the following:
 
March 31,
 
 
2020
 
 
2019
 
Stock options
   
6,676,879
     
5,416,085
 
Inducement stock options
   
1,030,000
     
500,000
 
Unvested restricted stock
   
1,495,536
     
1,621,845
 
Warrants
   
22,272,727
     
18,939,394
 
                 
 
31,475,142
   
26,477,324