v3.25.0.1

Stock-based Compensation (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Stock-based Compensation |  |
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ | ​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
Sales and marketing | ​ | $ | 4 | ​ | $ | 30 | ​ | $ | 19 | ​ | $ | 89
General and administrative | ​ | ​ | 13 | ​ | ​ | 128 | ​ | ​ | 83 | ​ | ​ | 384
Research and development | ​ | ​ | 15 | ​ | ​ | 58 | ​ | ​ | 67 | ​ | ​ | 183
Total stock-based compensation expense | ​ | $ | 32 | ​ | $ | 216 | ​ | $ | 169 | ​ | $ | 656
| ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Sales and marketing | ​ | $ | 107 | ​ | $ | 280
General and administrative | ​ | ​ | 451 | ​ | ​ | 1,494
Research and development | ​ | ​ | 209 | ​ | ​ | 313
Total stock-based compensation expense | ​ | $ | 767 | ​ | $ | 2,087
​
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | ​ |  | Exercise Price | ​ | Contractual | ​ | Value
​ | ​ | Shares | ​ | Per Share | ​ | Life (years) | ​ | (in thousands)
Outstanding at December 31, 2023 |  | 263 | ​ | $ | 21,909.50 | ​ | ​ | ​ | $ | —
Options granted |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Options exercised |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Options cancelled |  | (105) | ​ | ​ | 7,629.90 | ​ | ​ | ​ | ​ | ​
Outstanding at September 30, 2024 |  | 158 | ​ | $ | 31,381.48 | ​ | 6.10 | ​ | $ | —
Exercisable at September 30, 2024 | ​ | 144 | ​ | $ | 34,101.10 | ​ | 5.97 | ​ | $ | —
Vested and expected to vest at September 30, 2024 | ​ | 158 | ​ | $ | 31,381.48 | ​ | 6.10 | ​ | $ | —
Summary of unvested RSUs award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ |  | Grant Date
​ | ​ | Shares | ​ | Fair Value
Unvested RSUs at December 31, 2023 |  | 25 | ​ | $ | 7,505.04
Granted |  | — | ​ | ​ | —
Vested (1) |  | (17) | ​ | $ | (9,333.94)
Cancelled/Forfeited |  | — | ​ | ​ | —
Non-vested RSUs at September 30, 2024 |  | 8 | ​ | $ | 3,847.14
(1) | At September 30, 2024, there were 2 shares of common stock related to RSU awards that had vested and the shares were not distributed to the participants.
| ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ |  | Grant Date
​ | ​ | Shares | ​ | Fair Value
Unvested RSUs at December 31, 2021 | ​ | 591 | ​ | $ | 12,644.00
Granted | ​ | 566 | ​ | ​ | 981.36
Vested(1) | ​ | (865) | ​ | ​ | (5,651.52)
Cancelled/Forfeited | ​ | (213) | ​ | ​ | (11,013.04)
Unvested RSUs at December 31, 2022 |  | 79 | ​ | ​ | 10,100.70
Granted |  | — | ​ | ​ | —
Vested(1) |  | (54) | ​ | ​ | (11,298.98)
Cancelled/Forfeited |  | — | ​ | ​ | —
Non-vested RSUs at December 31, 2023 |  | 25 | ​ | $ | 7,505.04
(1) | At December 31, 2023 and 2022, there were 2 and 5 shares of common stock, respectively, related to RSU awards that have vested and the shares were not released to the participants subsequently. Additionally, during the year ended December 31, 2023 due to a decline in our stock price 8 shares of common stock were not issued in order to cover employee taxes.
Summary of assumptions used to estimate grant date fair value of stock options granted |  | ​
​ | ​ | ​ | ​
Risk-free interest rate |  | 2.67 | %
Expected term (in years) | ​ | 6.25 | ​
Expected dividend yield | ​ | 0 | %
Expected volatility | ​ | 80.40 | %
2003 Stock Incentive Plan, as amended and restated |  |
Stock-based Compensation |  |
Summary of stock option activity |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | ​ |  | Exercise Price | ​ | Contractual | ​ | Value
​ | ​ | Shares | ​ | Per Share |  | Life (years) |  | (in thousands)
Outstanding at December 31, 2021 | ​ | 306 | ​ | $ | 23,117.06 | ​ | ​ | ​ | $ | —
Options granted | ​ | 194 | ​ | ​ | 3,422.00 | ​ | ​ | ​ | ​ | ​
Options exercised | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Options cancelled | ​ | (130) | ​ | ​ | 8,071.28 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2022 |  | 370 | ​ | ​ | 18,075.70 | ​ | ​ | ​ | $ | —
Options granted |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Options exercised |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Options cancelled |  | (107) | ​ | ​ | 8,661.72 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2023 |  | 263 | ​ | ​ | 21,909.50 | ​ | 6.4 | ​ | $ | —
Exercisable at December 31, 2023 | ​ | 213 | ​ | ​ | 25,839.58 | ​ | 6.0 | ​ | ​ | —
Vested and expected to vest at December 31, 2023 | ​ | 274 | ​ | ​ | 21,909.50 | ​ | 6.4 | ​ | ​ | —

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