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Stock Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of our option activity |
Schedule of our option activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Options (in thousands) |  |  | Weighted Average Exercise Price per share |  |  | Weighted Average Remaining Option Term (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding at December 31, 2022 |  |  | 927 |  |  | $ | 7.97 |  |  |  | 8.34 |  |  | $ | - |
Granted |  |  | 1,475 |  |  |  | 0.93 |  |  |  | - |  |  |  | 235 |
Forfeited or expired |  |  | (91 | ) |  |  | 23.01 |  |  |  | - |  |  |  | - |
Outstanding at September 30, 2023 |  |  | 2,311 |  |  |  | 2.89 |  |  |  | 8.84 |  |  |  | 213 |
Exercisable at September 30, 2023 |  |  | 2,311 |  |  |  | 2.89 |  |  |  | 8.84 |  |  |  | 213 |
Schedule of the stock-based compensation expense |
Schedule of the stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
(in thousands) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Research and development |  | $ | 52 |  |  | $ | 306 |  |  | $ | 106 |  |  | $ | 553 |
Selling, general and administrative |  |  | 359 |  |  |  | 217 |  |  |  | 859 |  |  |  | 414 |
Total stock-based compensation |  | $ | 411 |  |  | $ | 523 |  |  | $ | 965 |  |  | $ | 967 |
Schedule of assumptions to estimate the fair value of options |
Schedule of assumptions to estimate the fair value of options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Weighted-average risk-free interest rate |  |  | 4.08 | % |  |  | - | % |  |  | 4.06 | % |  |  | 1.91 | %
Expected dividend payments |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Expected holding period (years)1 |  |  | 4.8 |  |  |  | - |  |  |  | 5.3 |  |  |  | 5.3 |
Weighted-average volatility factor2 |  |  | 1.14 |  |  |  | - |  |  |  | 1.10 |  |  |  | 1.16 |
Estimated forfeiture rates for options granted3 |  |  | 7.5 | % |  |  | - | % |  |  | 7.0 | % |  |  | 5.6 | %
(1) | Expected holding period is based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and the expectations of future employee behavior.
(2) | Weighted average volatility is based on the historical volatility of our common stock.
(3) | Estimated forfeiture rates are based on historical data.

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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