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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2023
STOCK-BASED COMPENSATION |
Schedule of weighted-average assumptions used in Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended June 30, | ​ |  | Six Months Ended June 30, |
​ |  | 2023 |  | 2022 |  | ​ | 2023 |  | 2022 | ​
Risk-free interest rate | ​ |  | 3.75 | % |  | 2.89 | % | ​ |  | 3.93 | % | ​ | 2.63 | %
Expected volatility | ​ |  | 79.29 | % |  | 75.09 | % | ​ |  | 79.45 | % |  | 74.66 | %
Expected term (years) | ​ |  | 5.26 | ​ |  | 5.57 | ​ | ​ |  | 5.70 | ​ |  | 5.62 | ​
Expected dividend yield | ​ | ​ | 0.00 | % | ​ | 0.00 | % | ​ | ​ | 0.00 | % |  | 0.00 | %
Fair value, per share | ​ | $ | 0.11 | ​ | $ | 0.70 | ​ | ​ | $ | 0.20 | ​ | $ | 1.34 | ​
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2023 | ​ | 2022 | ​ | 2023 | ​ | 2022
Cost of sales | ​ | $ | 5 | ​ | $ | 4 | ​ | $ | 9 | ​ | $ | 7
Selling, general and administrative | ​ |  | 339 | ​ |  | 224 | ​ | ​ | 659 | ​ | ​ | 470
Research and development | ​ | ​ | 76 | ​ | ​ | (49) | ​ | ​ | 157 | ​ | ​ | 104
Total stock-based compensation expense | ​ | $ | 420 | ​ | $ | 179 | ​ | $ | 825 | ​ | $ | 581

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -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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