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STOCKHOLDERS' EQUITY (Tables) | 9 Months Ended
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Sep. 30, 2021
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, 2021:
​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | Stock Options | ​ | Restricted Stock
Equity awards outstanding, beginning of year | ​ | 2,526 | ​ | ​ | 10,785
Changes during the year: | ​ | ​ | ​ | ​ | ​
Granted | ​ | — | ​ | ​ | 2,464
Exercised or vested | ​ | (53) | ​ | ​ | (1,106)
Expired or Forfeited | ​ | (6) | ​ | ​ | (150)
Equity awards outstanding, end of period | ​ | 2,467 | ​ | ​ | 11,993
Schedule of compensation cost related to unvested awards | As of September 30, 2021, 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 | $ | 523 | ​ | $ | 66,962
Expected weighted-average period in years of compensation cost to be recognized | ​ | 1.0 | ​ | ​ | 1.0

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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