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STOCKHOLDERS' EQUITY (Tables) | 9 Months Ended
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Sep. 30, 2022
STOCKHOLDERS' EQUITY |
Summary of activity for stock options and restricted stock | The following table summarizes the activity for stock options and restricted stock for the nine months ended September 30, 2022:
​ | ​ | ​ | ​ | ​
​ | ​ | Stock Options | ​ | Restricted Stock
Equity awards outstanding, beginning of year | ​ | 2,467,537 | ​ | 12,032,040
Changes during the year: | ​ | ​ | ​ | ​
Granted | ​ | 2,975,000 | ​ | 4,051,606
Exercised or vested | ​ | (130,607) | ​ | (2,581,705)
Expired or Forfeited | ​ | (158,193) | ​ | (2,075,112)
Equity awards outstanding, end of period | ​ | 5,153,737 | ​ | 11,426,829
Schedule of compensation cost related to unvested awards | As of September 30, 2022, total compensation cost related to unvested awards not yet recognized and the weighted-average periods over which the awards are expected to be recognized were as follows: ​
​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | Stock Options | ​ | Restricted Stock
Unrecognized compensation cost | $ | 9,034 | ​ | $ | 28,086
Expected weighted-average period in years of compensation cost to be recognized | ​ | 3.5 | ​ | ​ | 2.3

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