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STOCK BASED COMPENSATION EXPENSE (Tables) | 3 Months Ended
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Mar. 31, 2026
STOCK BASED COMPENSATION EXPENSE |
Summary of RSUs subject to time-based vesting | The following table summarizes the activity related to RSUs subject to time-based vesting requirements for the three months ended March 31, 2026:
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | RSUs
​ | ​ | Number of Shares | ​ | ​ | Weighted Average Grant Date Fair Value
Non-vested as of December 31, 2025 | ​ | 35,818 | ​ | $ | 328.25
Vested | ​ | (5,725) | ​ | ​ | 352.25
Forfeited | ​ | (2,708) | ​ | ​ | 317.66
Non-vested as of March 31, 2026 | ​ | 27,385 | ​ | $ | 324.25
​
Summary of the stock option plan and the changes during the period | A summary of the Company’s stock option plan and the changes during the period ended March 31, 2026 is presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | ​ | ​ ​ ​ | ​ | ​ | ​ ​ ​ | Weighted | ​ ​ ​ | ​ | ​ |
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ |
​ | ​ | Number of | ​ | Average | ​ | Remaining | ​ | Aggregate |
​ | ​ | Outstanding | ​ | Exercise | ​ | Contractual | ​ | Intrinsic |
​ | ​ | Options | ​ | Price | ​ | Years | ​ | Value |
Balance, December 31, 2025 |  | 234,147 | ​ | $ | 75.00 |  | 7.00 |  | ​ | ​ | ​
Expired |  | (5) | ​ | ​ | 15,000.00 |  | ​ |  | ​ | ​ | ​
Forfeited | ​ | (20,252) | ​ | ​ | 67.45 | ​ | ​ | ​ | ​ | ​ | ​
Balance, March 31, 2026 |  | 213,890 | ​ | $ | 75.72 |  | 6.75 | ​ | $ | — | (1)
Vested and Exercisable, March 31, 2026 |  | 204,488 | ​ | $ | 75.25 |  | 6.66 | ​ | $ | — | (1)
Vested and Expected to Vest, March 31, 2026 |  | 213,890 | ​ | $ | 75.72 |  | 6.75 | ​ | $ | — | (1)
​ (1) The Company’s closing stock price as of March 31, 2026 is $2.85 per share. As all outstanding options have an exercise price greater than the closing price, there does not exist any intrinsic value as of March 31, 2026.
Summary of stock-based compensation expense | Stock-based compensation included in the condensed consolidated statements of operations was as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ | ​ | 2026 | ​ ​ ​ | 2025
Cost of goods sold | ​ | $ | 19 | ​ | $ | 7
Research and development | ​ | ​ | 81 | ​ | ​ | 55
Selling and marketing | ​ |  | 383 | ​ |  | 305
General and administrative | ​ |  | 1,068 | ​ | ​ | 606
Total stock-based compensation expense | ​ | $ | 1,551 | ​ | $ | 973
​

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