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STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2022
STOCK-BASED COMPENSATION [Abstract]  
Weighted-Average Assumptions Used for Grants Issued The following weighted-average assumptions were used for stock options granted during the three months ended March 31, 2022:

   
Three months ended
March 31, 2022
 
Weighted average risk-free rate
   
1.92
%
Weighted average volatility
   
93
%
Dividend yield
   
0
%
Expected term
   
5.78 years
 
Summarizes of Stock Option Activity

The following table summarizes stock option activity for the three months ended March 31, 2022:

   
Outstanding Options
   
Weighted Average Exercise Price per Share
   
Weighted Average Remaining Contractual Life (in years)
   
Aggregate Intrinsic Value
 
Outstanding January 1, 2022
   
3,988,000
   
$
8.40
     
9.38
   
$
-
 
Granted
   
1,258,000
     
2.10
     
-
     
-
 
Cancelled
   
(67,000
)
   
5.94
     
-
         
Outstanding March 31, 2022
   
5,179,000
   
$
6.90
     
9.32
   
$
134,000
 
                                 
Options vested and exercisable at March 31, 2022
   
10,000
   
$
10.26
     
9.75
   
$
-
 
Summarizes of RSU Activity The following table summarizes RSU activity for the three months ended March 31, 2022:

   
Outstanding Restricted Stock Units
   
Weighted Average Fair Value per Share
 
January 1, 2022
   
240,000
   
$
13.80
 
Granted
   
1,101,000
     
1.93
 
Released
   
(9,000
)
   
4.21
 
Cancelled
   
(9,000
)
   
4.21
 
March 31 2022
   
1,323,000
   
$
4.05
 
                 
Balance expected to vest at March 31, 2022
   
772,000