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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Non-cash, Share-based Compensation Expense | For the three and six month periods ended June 30, 2021 and 2020, 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, |
| 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Research and development | $ | 38 |  |  | $ | 4 |  |  | $ | 74 |  |  | $ | 13 |
General and administrative |  | 95 |  |  |  | — |  |  |  | 200 |  |  |  | 7 |
Total | $ | 133 |  |  | $ | 4 |  |  | $ | 274 |  |  | $ | 20 |
Summary of Stock Option Activities | Stock option transactions for the six month period ended June 30, 2021 under the Company’s stock incentive plans were as follows:
| Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |
Options outstanding at December 31, 2020 |  | 531,238 |  |  | $ | 8.71 |  |  |  | 9.68 |
Granted |  | 147,200 |  |  |  | 3.63 |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited and cancelled |  | (53,537 | ) |  |  | 10.84 |  |  |  |  |
Options outstanding at June 30, 2021 |  | 624,901 |  |  | $ | 7.33 |  |  |  | 9.23 |
Options exercisable at June 30, 2021 |  | 100,180 |  |  | $ | 24.37 |  |  |  | 7.58 |
Options vested and expected to vest |  | 624,293 |  |  | $ | 7.33 |  |  |  | 9.23 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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