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SHARE-BASED COMPENSATION AND OTHER BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Components of Share-based Compensation Expense
The components of share-based compensation expense are as follows:
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Stock options$3,955 $769 $9,799 $1,698 
Restricted stock446 1,705 1,279 4,243 
Warrants283 259 570806
Total share-based compensation expense$4,684 $2,733 $11,648 $6,747 
Continuity of Stock Options Outstanding
The following table summarizes the status of stock options and related transactions:
Number of Stock OptionsWeighted-Average Per Share Exercise Price
Issued and Outstanding as of January 1, 202220,429,120 $3.20 
Granted (1)
1,667,000 $2.45 
Exercised (2)
(254,998)$1.69 
Forfeited/expired(340,002)$3.83 
Issued and Outstanding as of June 30, 202221,501,120 $3.15 
Exercisable as of June 30, 202210,639,594 $2.50 
(1)The weighted-average per share grant date fair value was $1.56.
(2)The weighted-average share price at the date of exercise was $3.99.
Summary of Stock Options Outstanding
The following table summarizes the issued and outstanding stock options as of June 30, 2022:
Expiration YearStock Options OutstandingExercise PriceStock Options Exercisable
2028720,000
$1.00 - $1.35
720,000
20297,019,668
$1.26 - $2.75
6,799,664
2030852,500
$0.91 - $3.98
423,326
203111,266,952
$3.70 - $6.53
2,696,604
20321,642,000 
$1.6 - $4.2
— 
21,501,12010,639,594
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions The following assumptions were applied at the time of grant:
Six Months Ended June 30,
20222021
Stock price
$1.60 - $3.94
$5.71 - $6.53
Risk-free annual interest rate
1.83% - 3.24%
0.45% - 1.25%
Expected annual dividend yield0%0%
Volatility74%77%
Expected life of stock options
5.2 - 7.5 years
5 - 7.48 years
Forfeiture rate0%0%
Nonvested Restricted Stock Shares Activity The following table summarizes the status of restricted stock and related transactions:
Number of Restricted Subordinate Voting Shares
Unvested restricted stock as of January 1, 20222,859,151
Granted (1)
5,952 
Cancelled(7,813)
Vested(1,644,588)
Unvested restricted stock as of June 30, 20221,212,702
(1)     The weighted-average per share grant date fair value was $4.20