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STOCK-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
SCHEDULE OF STOCK BASED COMPENSATION

The following table summarizes stock-based compensation expense for the three and nine months ended September 30, 2022 and 2021 (in thousands):

 

  

For the three months ended

September 30,

  

For the nine months ended

September 30

 
   2022   2021   2022   2021 
                 
Research and development  $173   $688   $729   $2,935 
General and administrative   459    1,849    1,489    3,980 
Total stock-based compensation expense  $632   $2,537   $2,218   $6,915 
SCHEDULE OF WEIGHTED-AVERAGE ASSUMPTIONS TO ESTIMATE THE FAIR VALUE OF THE OPTIONS GRANTED

The Company estimated the fair value of stock options granted in the periods presented utilizing a Black-Scholes option-valuation model utilizing the following assumptions:

 

    For the nine months ended September 30, 
    2022    2021 
           
Expected volatility   95.1% - 96.0%    91.8% - 99.8% 
Expected term   6.07 - 6.08 years    5.25 - 6.08 years 
Risk-free interest rate   1.7% - 3.3%    0.8% - 1.2% 
Expected dividend yield        
SCHEDULE OF RESTRICTED STOCK AWARD ACTIVITY

The following table summarizes restricted stock award activity during the nine months ended September 30, 2022:

 

  

Number of

Awards

   Weighted Average Grant Date Fair Value 
         
Outstanding at December 31, 2021   97,260   $46.59 
Granted   779,722   $3.12 
Cancelled/forfeited   (30,742)  $40.65 
Vested   (24,971)  $50.66 
Outstanding at September 30, 2022   821,269   $5.42 
2015 Equity Incentive Plan [Member]  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
SCHEDULE OF STOCK OPTIONS ACTIVITY

The following table summarizes stock option activity for the 2015 Incentive Plan during the nine months ended September 30, 2022: 

   Number of Options   Weighted Average Exercise Price  

Weighted Average Remaining

Contractual

Term (years)

   Aggregate Intrinsic Value (in thousands) 
                 
Outstanding at December 31, 2021   314,194   $38.48    7.63   $ 
Granted   7,760   $5.30       $ 
Cancelled/forfeited   (82,510)  $39.31       $ 
Exercised      $       $ 
Outstanding at September 30, 2022   239,444   $37.10    6.71   $ 
Exercisable   140,414   $36.67    5.39   $ 
Unvested   99,030   $37.72    8.58   $ 

2005 Equity Incentive Plan [Member]  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
SCHEDULE OF STOCK OPTIONS ACTIVITY

The following table summarizes stock option activity for the 2005 Incentive Plan during the nine months ended September 30, 2022:

 

   Number of Options   Weighted Average Exercise Price  

Weighted Average Remaining

Contractual Term (years)

   Aggregate Intrinsic Value (in thousands) 
                 
Outstanding at December 31, 2021   3,200   $32.00    1.80   $ 
Cancelled/forfeited      $       $ 
Exercised      $       $ 
Outstanding at September 30, 2022   3,200   $32.00    1.04   $ 
Exercisable   3,200   $32.00    1.04   $ 
Unvested      $       $