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SHARE-BASED COMPENSATION AND OTHER BENEFITS (Tables)
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
2022202120222021
Stock options$4,569 $1,093 $14,369 $2,791 
Restricted stock347 1,015 1,625 5,258 
Warrants550 126 1,120932
Total share-based compensation expense$5,466 $2,234 $17,114 $8,981 
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)
10,311,000 $2.01 
Exercised (2)
(274,998)$1.66 
Forfeited/expired/cancelled(2,037,002)$4.58 
Issued and Outstanding as of September 30, 202228,428,120 $2.68 
Exercisable as of September 30, 202211,863,260 $2.44 
(1)The weighted-average per share grant date fair value was $1.44.
(2)The weighted-average share price at the date of exercise was $3.84.
Summary of Stock Options Outstanding
The following table summarizes the issued and outstanding stock options as of September 30, 2022:
Expiration YearStock Options OutstandingExercise PriceStock Options Exercisable
202250,000
$1.35 - $2.00
50,000
2028685,000
$1.00 - $1.35
685,000
20296,849,668
$1.26 - $2.75
6,689,665
2030792,500
$0.91 - $3.98
426,660
20319,809,952
$3.70 - $6.53
2,837,941
203210,241,000 
$1.60 - $4.20
1,173,994 
28,428,12011,863,260
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions The following assumptions were applied at the time of grant:
Nine Months Ended September 30,
20222021
Risk-free annual interest rate
0.45% - 3.24%
0.45% - 1.25%
Expected annual dividend yield0%0%
Volatility
72.3% - 78.5%
74.0% - 78.5%
Expected life of stock options
5.0 - 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)
86,952 
Cancelled(7,813)
Vested(1,701,221)
Unvested restricted stock as of September 30, 20221,237,069
(1)     The weighted-average per share grant date fair value was $2.05