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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
STOCK-BASED COMPENSATION. |
Schedule of Common Stock Options | The following table summarizes information related to the Company’s common stock options: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ |  | ​ |  | Weighted | ​ | Remaining | ​ | ​ | ​
​ | ​ | Number | ​ | Average | ​ | Contractual | ​ | Aggregate
​ | ​ | of Stock | ​ | Exercise | ​ | Term | ​ | Intrinsic
​ | ​ | Options | ​ | Price | ​ | (in years) | ​ | Value
Options outstanding at January 1, 2021 |  | 3,183,708 | ​ | $ | 1.71 |  |  |  | ​ |
Granted |  | 315,620 | ​ |  | 7.25 |  |  |  | ​ |
Exercised |  | (201,039) | ​ |  | 1.97 |  |  |  | ​ |
Canceled/Forfeited |  | (76,333) | ​ |  | 3.33 |  |  |  | ​ |
Expired |  | — | ​ |  | — |  |  |  | ​ |
Options outstanding at December 31, 2021 |  | 3,221,956 | ​ | $ | 2.19 |  | 5.12 | ​ | $ | 31,947,381
Options exercisable at December 31, 2021 |  | 2,601,337 | ​ | $ | 1.67 |  | 4.27 | ​ | $ | 27,170,404
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | Option valuation weighted-average assumptions were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2021 | ​ | 2020 | ​ | 2019
Expected volatility |  | 65.99 | % | ​ | 60.78 | % | ​ | 46.17 | %
Expected dividend yield |  | — | % | ​ | — | % | ​ | — | %
Expected term (in years) |  | 6.00 |  | ​ | 5.94 | ​ | ​ | 5.94 | ​
Weighted average risk-free rate |  | 0.97 | % | ​ | 0.41 | % | ​ | 1.87 | %
Schedule of compensation expense | Compensation expense is as follows for the three years ended December 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
Compensation Expense | ​ | 2021 | ​ | 2020 | ​ | 2019
Stock options | ​ | $ | 649 | ​ | $ | 405 | ​ | $ | 348
Restricted stocks and Performance-based shares | ​ |  | 317 | ​ |  | — | ​ |  | —
​ | ​ | $ | 966 | ​ | $ | 405 | ​ | $ | 348
Schedule of weighted-average grant date fair value of options granted | Therefore, the weighted-average grant date fair value of options granted is as follows for the three years ended December 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2021 | ​ | 2020 | ​ | 2019
Weighted average grant date fair value | ​ | $ | 5.68 | ​ | $ | 0.95 | ​ | $ | 0.94

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