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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of restricted stock unit activities
  

Restricted

Stock Units

  

Weighted

Average Grant

Date Fair Value

 
Non-vested 1/1/2021   274,616   $29.95 
Granted   10,500    
-
 
Forfeited   
-
    
-
 
Vested   (171,686)   29.40 
Non-vested 9/30/2021   113,430   $29.04 

 

Schedule of the fair value of stock options granted
   For the nine months ended
September 30,
   2021  2020
Exercise price  $ 8.23 - $ 19.82  $ 20.51 - $ 51.12
Dividend yield  0.00%  0.00%
Expected volatility  91.00% - 98.00%  95.00% - 101.00%
Risk-free interest rate  0.45% - 1.14%  0.28% - 1.69%
Expected life (in years)  5.27 - 6.08  5.27 - 6.08

 

Schedule of stock option activities
   Options   Weighted Average Exercise Price   Weighted Average Remaining Contractual Term (years)   Aggregate Intrinsic Value 
Outstanding 1/1/2021   674,039   $25.23    9.06   $2,311 
Granted   780,300    17.31    
-
    
-
 
Exercised   
-
    
-
    
-
    
-
 
Forfeited   (60,696)   21.74    
-
    
-
 
Expired   (7,788)   25.29    
-
    
-
 
Outstanding 9/30/2021   1,385,855   $20.92    8.89   $- 
                     
Exercisable as of 9/30/2021   329,046   $22.76    8.13   $- 

 

Schedule of total stock-based compensation costs
  

For the

three months ended

September 30,

  

For the

nine months ended

September 30,

 
   2021   2020   2021   2020 
Restricted Stock Units  $1,307   $1,307   $3,970   $5,051 
Stock options   1,409    1,474    4,484    2,356 
Total  $2,716   $2,781   $8,454   $7,407 

 

Schedule of stock-based compensation expense
  

For the

three months ended

September 30,

  

For the

nine months ended

September 30,

 
   2021   2020   2021   2020 
Research and development  $392   $158   $1,114   $568 
General and administrative   2,324    2,623    7,340    6,839 
Total  $2,716   $2,781   $8,454   $7,407