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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2023
Schedule of the restricted stock transactions | The following table sets forth the restricted stock unit transactions for the periods indicated:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Aggregate Intrinsic Value(1) (In thousands)
Unvested outstanding shares at December 31, 2021 | ​ | 775,515 | ​ | $ | 9.16 | ​ | $ | 2,914
Granted | ​ | 225,700 | ​ | ​ | 13.75 | ​ | ​ | ​
Vested | ​ | (98,121) | ​ | ​ | 11.40 | ​ | ​ | ​
Forfeited | ​ | (13,700) | ​ | ​ | 12.20 | ​ | ​ | ​
Unvested outstanding shares at December 31, 2022 | ​ | 889,394 | ​ | $ | 10.03 | ​ | $ | 3,993
Granted | ​ | 30,000 | ​ | ​ | 10.68 | ​ | ​ | ​
Vested | ​ | (158,845) | ​ | ​ | 12.48 | ​ | ​ | ​
Forfeited | ​ | (509,013) | ​ | ​ | 9.04 | ​ | ​ | ​
Unvested outstanding shares at December 31, 2023 | ​ | 251,536 | ​ | $ | 10.56 | ​ | $ | 1,141
(1) | The intrinsic value of restricted stock was calculated as the closing market price on December 31, 2023 and 2022 of the underlying stock multiplied by the number of restricted shares that would be issuable. The total fair value of shares vested was $1.5 million for the year ended December 31, 2023.
Restricted Stock |
Schedule of assumptions used in calculating fair value of the Company's stock-based compensation | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​
​ | ​ | December 31, 2020 | ​
Weighted average value per performance based RSUs granted during the period | ​ | $ | 6.13 | ​
Assumptions: | ​ | ​ | ​ | ​
Stock price volatility(1) | ​ | ​ | 51.79 | %
Risk free rate of return | ​ | ​ | 1.22 | %
Expected term | ​ | ​ | 3.9 | years
(1) | Due to the Company’s limited historical data, expected volatility was estimated using volatilities of peer entities as defined in the award agreements whose share prices and assumptions were publicly available.
Stock options |
Schedule of assumptions used in calculating fair value of the Company's stock-based compensation | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​
​ |  | December 31, 2020 |
Weighted average value per option granted during the period | ​ | $ | 3.36 | ​
Assumptions: | ​ | ​ | ​ | ​
Stock price volatility(1) | ​ | ​ | 61.87 | %
Risk free rate of return | ​ | ​ | 1.21 | %
Expected term | ​ | ​ | 4.75 | years
(1) | Due to the Company’s limited historical data, expected volatility was estimated using volatilities of similar entities whose share or option prices and assumptions were publicly available.

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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