Quarterly report pursuant to Section 13 or 15(d)

Stock Option and Incentive Plans (Tables)

v3.21.2
Stock Option and Incentive Plans (Tables)
6 Months Ended
Jun. 30, 2021
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity A summary of stock option activity for the
 
six
months ended June 30, 2021, is summarized as follows:​​​​​​​
 
    
Number of
Options
    
Weighted
Average
Exercise
Price
    
Weighted
Average
Remaining
Contractual
Life
(in years)
    
Aggregate
Intrinsic
Value
 
Options outstanding at December 31, 2020
     1,853,841      $ 14.33                    
Granted
     1,100,000        4.35                    
Exercised
     —          —                      
Expired
     (95,336      45.96                    
Forfeited
     (9,812      6.50                    
    
 
 
                            
Options outstanding at June 30, 2021
     2,848,693        9.44        8.28      $ 305,101  
    
 
 
                      
 
 
 
Vested and exercisable at June 30, 2021
     1,155,624        14.88        6.86      $ 72,436  
    
 
 
                      
 
 
 
Assumptions to Compute Fair Value of Stock Option Grants
The following assumptions were used to compute the fair value of stock options granted during the period:
 
    
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
    
2021
   
2020
   
2021
   
2020
 
Risk free interest rate
     0.85     0.33     0.84     1.17
Expected dividend yield
     —         —         —         —    
Expected term (in years)
     5.97       5.86       5.98       6.03  
Expected volatility
     94.3     97.1     94.5     94.5