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v3.23.2

Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Share-based Compensation [Abstract] |  |  |  |  |  |  |
Additional shares authorized (in shares) | 3,500,000 |  |  |  |  |  |
Shares available for grant (in shares) | 5,253,971 | 5,253,971 |  |  |  | 5,253,971 |
Stock-based compensation expense |  |  |  |  |  | $ 1,364 | $ 1,590
Taxes paid on cashless exercise of restricted stock units |  |  |  |  |  | 5 | 29
General and Administrative Expense [Member] |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 393 |  | $ 487 |  | 764 | 953
Research and Development Expense [Member] |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 289 |  | $ 325 |  | $ 600 | $ 637
Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |
Options granted (in shares) |  | 37,500 |  | 801,004 |  | 37,500 | 801,004
Weighted average grant date fair value (in dollars per share) |  | $ 0.35 |  | $ 1.09 |  | $ 0.35 | $ 1.09
Dividend yield |  |  |  |  |  | 0.00% | 0.00%
Volatility |  |  |  |  |  | 81.00% | 86.00%
Risk free interest rate |  |  |  |  |  | 4.00% | 3.00%
Expected term |  |  |  |  |  | 6 years | 6 years
Unrecognized stock-based compensation expense expected to be recognized related to unvested stock options | $ 3,009 | $ 3,009 |  |  |  | $ 3,009 |
Weighted average amortization period |  |  |  |  |  | 2 years 3 months |
Common stock issued upon exercise of options (in shares) |  | 0 |  | 0 |  | 0 | 0
Number of stock options returned to plan upon expiration (in shares) |  | 213,125 |  | 255,000 |  | 253,125 | 255,000
Stock options expiration period |  | 10 years |  | 10 years |  | 10 years | 10 years
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |
RSUs granted (in shares) |  | 24,999 | 0 | 258,363 | 0 |  |
Weighted average fair value at date of grant (in dollars per share) |  | $ 0.5 |  | $ 1.46 |  |  |
Taxes paid on cashless exercise of restricted stock units |  | $ 5 |  | $ 29 |  |  |
Unrecognized stock-based compensation expense expected to be recognized related to unvested RSUs | $ 1,074 | $ 1,074 |  |  |  | $ 1,074 |
Weighted average amortization period |  |  |  |  |  | 2 years 2 months 26 days |
Common stock issued upon vesting RSUs (in shares) |  | 215,255 | 0 | 191,795 | 0 |  |

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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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