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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Summary of Stock Option Activity | A summary of the stock option activity under the 2018 Plan and the 2019 Plan is presented below:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding as of January 1, 2018 |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Granted |  |  | 971,353 |  |  |  | 1.01 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2018 |  |  | 971,353 |  |  |  | 1.01 |  |  |  | 9.8 |  |  | $ | 4,051 |
Granted |  |  | 1,340,839 |  |  |  | 7.97 |  |  |  |  |  |  |  |  |
Exercised |  |  | (5,667 | ) |  |  | 1.01 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (176,893 | ) |  |  | 4.22 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2019 |  |  | 2,129,632 |  |  | $ | 5.12 |  |  |  | 9.2 |  |  | $ | 18,844 |
Options Exercisable at December 31, 2019 |  |  | 365,385 |  |  | $ | 1.61 |  |  |  | 8.9 |  |  | $ | 4,516 |
Schedule of Assumptions Used to Estimate Fair Value of Stock Options | The fair value of each award is estimated using Black-Scholes based on the following assumptions:
|  | For the Year Ended December 31,
|  | 2019 |  | 2018
Risk-free interest rate |  | 1.39%—2.59% |  | 2.92%—2.96%
Expected term |  | 0.3—6.1 years |  | 5.5—6.2 years
Expected volatility |  | 70%—76% |  | 72%
Expected dividend yield |  | 0% |  | 0%
Summary of Stock-Based Compensation | The Company has recorded stock-based compensation in the accompanying statements of operations as follows:
|  | For the Year Ended December 31, |
|  | 2019 |  |  | 2018 |
Research and development |  | $ | 1,304 |  |  | $ | 455 |
General and administrative |  |  | 996 |  |  |  | 151 |
Total |  | $ | 2,300 |  |  | $ | 606 |

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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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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