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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of Non-cash, Share-based Compensation Expense | For the three and six months ended June 30, 2023 and 2022, the Company recognized the following non-cash, share-based compensation expense in the statements of operations (in thousands):
| Three Months Ended June 30, |  |  | Six Months Ended June 30, |
| 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Research and development | $ | 42 |  |  | $ | 51 |  |  | $ | 83 |  |  | $ | 92 |
General and administrative |  | 145 |  |  |  | 121 |  |  |  | 308 |  |  |  | 247 |
Total | $ | 187 |  |  | $ | 172 |  |  | $ | 391 |  |  | $ | 339 |
Summary of Stock Option Activities | Stock option transactions for the six months ended June 30, 2023 under the Company’s stock incentive plans were as follows:
|  | Options Outstanding |
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |
Options outstanding - December 31, 2022 |  |  | 704,960 |  |  | $ | 5.62 |  |  |  | 8.29 |
Granted |  |  | — |  |  |  | — |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |
Forfeited and cancelled |  |  | (85,178 | ) |  |  | 5.80 |  |  |  |
Options outstanding - June 30, 2023 |  |  | 619,782 |  |  | $ | 5.60 |  |  |  | 7.82 |
Options exercisable - June 30, 2023 |  |  | 367,516 |  |  | $ | 7.25 |  |  |  | 7.62 |
Options vested and expected to vest |  |  | 619,689 |  |  | $ | 5.60 |  |  |  | 7.82 |
Summary of Stock Award Transactions under Stock Incentive Plans | Stock award transactions for the six months ended June 30, 2023 under the Company’s stock incentive plans were as follows:
|  | Restricted Stock Units Outstanding |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
RSUs outstanding - December 31, 2022 |  |  | 91,000 |  |  | $ | 2.21 |
Granted |  |  | — |  |  |  | — |
Vested and released |  |  | — |  |  |  | — |
Forfeited and cancelled |  |  | — |  |  |  | — |
RSUs outstanding - June 30, 2023 |  |  | 91,000 |  |  | $ | 2.21 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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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