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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 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   (133,624)   29.26 
Non-vested 6/30/2021   151,492   $29.26 

 

Schedule of the fair value of stock options granted
   For the six months ended
June 30,
 
   2021   2020 
Exercise price   $ 10.51 - $ 19.82    $ 24.02 - $ 51.12 
Dividend yield   0.00%   0.00%
Expected volatility   92.00% - 98.00%     95.00% - 101.00% 
Risk-free interest rate   0.45% - 1.14%    0.40% - 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   776,300    17.35    
-
    
-
 
Exercised   
-
    
-
    
-
    
-
 
Forfeited   (27,512)   23.22    
-
    
-
 
Expired   (7,038)   24.25    
-
    
-
 
Outstanding 6/30/2021   1,415,789   $20.95    9.16   $77 
                     
Exercisable as of 6/30/2021   241,568   $23.16    8.22   $53 

 

Schedule of total stock-based compensation costs
  

For the three months ended

June 30,

  

For the six months ended

June 30,

 
   2021   2020   2021   2020 
Restricted Stock Units  $1,360   $1,315   $2,663   $3,745 
Stock options   1,638    514    3,075    882 
Total  $2,998   $1,829   $5,738   $4,627 

 

Schedule of stock-based compensation expense
  

For the three months ended

June 30,

  

For the six months ended

June 30,

 
   2021   2020   2021   2020 
Research and development  $453   $202   $724   $411 
General and administrative   2,545    1,627    5,014    4,216 
Total  $2,998   $1,829   $5,738   $4,627