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EQUITY INCENTIVE PLAN (Tables)
9 Months Ended
Sep. 30, 2021
EQUITY INCENTIVE PLAN [Abstract]  
Stock Option Activity
A summary of the stock option activity under the 2013 Plan and the 2021 Plan is presented in the table below:

   
Number of
Options
   
Weighted
Average Exercise
Price
   
Weighted
Average
Remaining
Contractual Term
(Years)
   
Aggregate
Intrinsic Value
 
Outstanding at December 31, 2020
   
7,369,541
   
$
2.37
     
6.77
   
$
4,094
 
Granted
   
3,104,585
     
9.07
                 
Exercised
   
(2,163,932
)
   
2.03
                 
Forfeited
   
(184,017
)
   
8.64
                 
Outstanding at September 30, 2021
   
8,126,177
   
$
4.88
     
7.59
   
$
30,222
 
Options exercisable at September 30, 2021
   
4,371,817
     
2.61
     
6.21
   
$
25,100
 
Vested and expected to vest at September 30, 2021
   
7,805,361
   
$
4.78
     
7.53
   
$
29,784
 
Restricted Stock Activity
A summary of the RSU activity under the 2013 Plan and the 2021 Plan is presented in the table below:

   
Number of
Shares
Underlying
RSUs
   
Weighted
Average Grant-
Date Fair Value
 
Outstanding non-vested RSUs at December 31, 2020
   
-
    $ -  
Granted
   
4,861,315
   

8.03
 
Repurchased
   
-
     
-
 
Restrictions lapsed
   
-
     
-
 
Outstanding non-vested RSUs at September 30, 2021
   
4,861,315
   
$
8.03
 
Stock-Based Compensation Expense
The Company’s stock-based compensation expense is allocated to the following operating expense categories as follows:

   
Three months ended September 30,
   
Nine months ended September 30,
 
   
2021
   
2020
   
2021
   
2020
 
Research and development
 
$
1,520
   
$
355
   
$
4,343
   
$
1,217
 
General and administrative
   
5,626
     
64
     
12,918
     
160
 
Sales and marketing
   
250
     
74
     
579
     
224
 
Total stock-based compensation expense
 
$
7,396
   
$
493
   
$
17,840
   
$
1,601