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Stock-Based Compensation Expense (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense included in the Company’s consolidated statements of operations and comprehensive loss was as follows (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Research and development |  | $ | 229 |  |  | $ | 26 |
General and administrative |  |  | 1,584 |  |  |  | 218 |
Total |  | $ | 1,813 |  |  | $ | 244 |
Schedule of Fair Value of Stock Option Estimated on Date of Grant Using Black-Scholes Option-Pricing Model | The fair value of each stock option granted to employees, directors and non-employees was estimated on the date of grant using the Black-Scholes option-pricing model, with the following weighted-average assumptions:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Risk-free interest rate |  |  | 0.6 | % |  |  | 2.2 | %
Expected dividend yield |  |  | — | % |  |  | — | %
Expected term (in years) |  |  | 6.0 |  |  |  | 6.1 |
Expected volatility |  |  | 80.7 | % |  |  | 76.8 | %
Summary of Stock Option Activity Under Plans | A summary of the stock option activity under the Plans for the year ended December 31, 2020 was as follows:
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding December 31, 2019 |  |  | 792,439 |  |  | $ | 6.59 |  |  |  | 7.3 |  |  | $ | 3,363 |
Granted |  |  | 763,505 |  |  |  | 14.16 |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,814 | ) |  |  | 2.92 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (124,244 | ) |  |  | 9.30 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2020 |  |  | 1,428,886 |  |  | $ | 10.41 |  |  |  | 7.7 |  |  | $ | 5,165 |
Exercisable at December 31, 2020 |  |  | 626,578 |  |  | $ | 9.30 |  |  |  | 6.0 |  |  | $ | 3,099 |
Vested and expected to vest at December 31, 2020 |  |  | 1,428,886 |  |  | $ | 10.41 |  |  |  | 7.7 |  |  | $ | 5,165 |

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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