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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock-based compensation | Stock-based compensation for the periods presented was as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | ​ | 2024 |  | 2023 | ​ | 2024 |  | 2023
Selling, general and administrative | ​ | $ | 2,223 | ​ | $ | 1,796 | ​ | $ | 6,707 | ​ | $ | 3,531
Research and development | ​ | ​ | 305 | ​ | ​ | 376 | ​ | ​ | 955 | ​ | ​ | 1,399
Total stock-based compensation expense | ​ | $ | 2,528 | ​ | $ | 2,172 | ​ | $ | 7,662 | ​ | $ | 4,930
Employee Stock Option [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of weighted-average assumptions relating to options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2024 |  | 2023 |  |  | 2024 |  | 2023 |
Risk-free interest rate | ​ | 4.5 | % | 3.7 | % | ​ | 4.2 | % | 3.7 | %
Expected term (in years) | ​ | 6.0 | ​ | 6.7 | ​ | ​ | 6.2 | ​ | 7.0 | ​
Dividend yield | ​ | 0.0 | % | 0.0 | % | ​ | 0.0 | % | 0.0 | %
Expected volatility | ​ | 88.1 | % | 86.0 | % | ​ | 87.4 | % | 83.1 | %

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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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- Definition Line items represent financial concepts included in a table. 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