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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of our option activity |
Schedule of our option activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Shares (in thousands) |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding at January 1, 2022 |  |  | 682 |  |  | $ | 12.53 |  |  |  | 8.98 |  |  | $ | - |
Granted |  |  | 310 |  |  |  | 1.18 |  |  |  | - |  |  |  | - |
Cancelled/expired |  |  | (65 | ) |  |  | 23.40 |  |  |  | - |  |  |  | - |
Outstanding at December 31, 2022 |  |  | 927 |  |  | $ | 7.97 |  |  |  | 8.34 |  |  | $ | - |
Exercisable at December 31, 2022 |  |  | 927 |  |  | $ | 7.97 |  |  |  | 8.34 |  |  | $ | - |
Schedule of assumptions to estimate the fair value of options |
Schedule of assumptions to estimate the fair value of options |  |  |  |  |  |  |  |
|  | For the Years Ended December 31, |
|  | 2022 |  |  | 2021 |
Weighted-average risk-free interest rate |  |  | 1.9 | % |  |  | 0.5 | %
Expected dividend payments |  |  | - |  |  |  | - |
Expected holding period (years)(1) |  |  | 5.26 |  |  |  | 5.45 |
Weighted-average volatility factor(2) |  |  | 1.16 |  |  |  | 1.14 |
Estimated forfeiture rates for options granted |  |  | 6 | % |  |  | 30 | %
| (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.
Schedule of the stock-based compensation expense |
Schedule of the stock-based compensation expense |  |  |  |  |  |  |  |
|  | For the Years Ended December 31, |
|  | 2022 |  |  | 2021 |
Research and development |  | $ | 553 |  |  | $ | 749 |
General and administrative |  |  | 394 |  |  |  | 756 |
Total stock-based compensation expenses |  | $ | 947 |  |  | $ | 1,505 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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