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STOCK-BASED COMPENSATION | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION In 2018, our stockholders approved the adoption of the SenesTech, Inc. 2018 Equity Incentive Plan (the “2018 Plan”), which provides for the issuance of stock-based instruments, such as stock options or restricted stock units, to employees or consultants as deemed appropriate. The 2018 Plan has since been amended and restated on certain occasions, most recently on July 11, 2024, when our stockholders approved an increase to the total number of authorized shares to 207,071 shares. As of September 30, 2025, we have 32,241 shares of common stock available for issuance under the 2018 Plan. Currently, only stock options are outstanding under the 2018 Plan, which are generally issued with a per share exercise price equal to the fair market value of our common stock at the date of grant. Options granted generally vest ratably over a 12- to 36-month period coinciding with their respective service periods, with terms generally of ten years. Certain stock option awards provide for accelerated vesting upon a change in control. The following table presents the outstanding stock option activity:
| Number of Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term (years) |  |
Three months ended September 30, 2025: |  |  |  |  |  |  |  |
Outstanding as of June 30, 2025: | 175,662 |  |  |  | $ | 23.14 |  |  | 9.1 |  |
Granted | — |  |  |  | — |  |  | — |  |  |
Exercised | — |  |  |  | — |  |  | — |  |  |
Forfeited | — |  |  |  | — |  |  | — |  |  |
Expired | (59) |  |  |  | 4,658.85 |  |  | — |  |  |
Outstanding as of September 30, 2025 | 175,603 |  | (1) |  | 21.58 |  |  | 8.8 |  |
Nine months ended September 30, 2025: |  |  |  |  |  |  |  |
Outstanding as of December 31, 2024 | 147,616 |  |  |  | 27.13 |  |  | 9.5 |  |
Granted | 28,057 |  |  |  | 3.09 |  |  | 9.5 |  |
Exercised | — |  |  |  | — |  |  | — |  |  |
Forfeited | (11) |  |  |  | 2,497.70 |  |  | — |  |  |
Expired | (59) |  |  |  | 4,658.85 |  |  | — |  |  |
Outstanding as of September 30, 2025 | 175,603 |  | (1) |  | 21.58 |  |  | 8.8 |  |
Exercisable as of September 30, 2025 | 107,388 |  |  |  | 33.24 |  |  | 8.7 |  |
(1) Includes options related to 603 shares that are inducement awards and not granted under the 2018 Plan. The weighted average grant date fair value of options granted during the nine months ended September 30, 2025 was $3.08 per share based on the following assumptions used in the Black-Scholes option pricing model:
Expected volatility | 162 | %
Expected dividend yield | — | %
Expected term (in years) | 10
Risk-free interest rate | 4.67 | %
The expected volatility assumption is based on the calculated volatility of our common stock at the date of grant based on historical prices over the most recent period commensurate with the term of the award. The expected dividend yield assumption is based on our history and expected dividend payouts: we have not, and do not expect to, pay dividends. The expected term assumption is the contractual term of the options. The risk-free interest rate assumption is determined using the U.S. treasury yields for bonds with a maturity commensurate with the term of the award. The stock-based compensation expense was recorded as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Research and development | $ | 2 |  |  | $ | 5 |  |  | $ | 8 |  |  | $ | 13 |
Selling, general and administrative | 45 |  | 68 |  | 220 |  | 233
Total stock-based compensation expense | $ | 47 |  |  | $ | 73 |  |  | $ | 228 |  |  | $ | 246 |
The allocation between research and development and selling, general and administrative expense was based on the department and services performed by the employee or non-employee. As of September 30, 2025, the total compensation cost related to unvested options not yet recognized, unamortized stock-based compensation, was $198,000, which will be recognized over a weighted average period of 2.1 years, assuming the employees and non-employees complete their service period required for vesting.

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