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Stock Options and Stock Grants (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
We follow ASC Topic 718, Share-Based Payments, in which compensation expense is recognized only for share-based payments expected to vest.

We follow ASC Topic 718, Share-Based Payments, in which compensation expense is recognized only for share-based payments expected to vest. 

 

               
   Years ended
December 31,		 
   2021   2020 
Share-based compensation expense  $160   $195 
Remaining unrecognized compensation expense   $1,581      
Remaining weighted average-period, expense recognition (years)   2.9      

 
Schedule of assumptions used to calculate Black-Scholes option pricing model for options granted

The following table illustrates the various assumptions used to calculate the Black-Scholes option pricing model for options granted for all years presented:

 

   Years Ended
December 31,		 
    2021   2020 
Weighted-average risk-free interest rates:   1.4%   0.5%
           
Dividend yield:   0%   0%
           
Weighted-average expected life (years) of the option:   5    5 
           
Weighted-average expected stock price volatility:   115%   95%
           
Weighted-average fair value of the options granted:  $2.59   $0.28 
Additional disclosures for options granted for all years presented:

Additional disclosures for options granted for all years presented:

 

   Years Ended
December 31,		 
    2021   2020 
Vesting period (years) of shares granted in period   3    3 
           
Contractual life (years) of shares granted in period   7    7 
           
Estimated forfeitures   4%   4%
Schedule of option activity

The following table summarizes the option activity for our employees and directors during the year ended December 31, 2021:

 

Options  Shares
(Rounded)		   Weighted
Average
Exercise
Price
per Share		   Weighted
Average
Remaining
Contractual
Term (Years)		   Aggregate
Intrinsic
Value
(000s)		 
Outstanding on January 1, 2021   3,412,686   $0.57    —    — 
                     
Granted   567,500   $4.14    —    — 
Exercised   (535,100)  $0.44    —    — 
Forfeited or expired   (251,870)  $1.09    —    — 
                     
Outstanding on December 31, 2021   3,193,216   $1.18    5.1   $10,267 
Exercisable on December 31, 2021   2,189,378   $0.56    4.4   $8,405 
                     
Shares available for grant   1,887,500                
The aggregate intrinsic value in the table above is based on our closing stock price of $4.40 on the last business day for the year ended December 31, 2021.

The aggregate intrinsic value in the table above is based on our closing stock price of $4.40 on the last business day for the year ended December 31, 2021.

 

             
   Years ended
December 31,		 
   2021   2020 
Shares exercised   535,100    84,500 
Total intrinsic value  $1,169   $10 
Cash received  $234   $37