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Common Stock | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Common Stock | 9. Common Stock Common Stock Pursuant to the Amended and Restated Certificate of Incorporation filed in August 2018, the Company was authorized to issue a total of 21,147,115 shares of common stock, of which 3,848,320 shares were issued and outstanding at December 31, 2018. In January 2019, the Company’s certificate of incorporation was further amended to authorize the issuance of 29,000,000 shares of common stock. In October 2019, the Company’s certificate of incorporation was further amended to authorize the issuance of 143,590,481 shares of voting common stock and 6,409,519 shares of non-voting common stock. Holders of voting common stock shall have the exclusive right to vote for the election of directors of the Company and on all other matters requiring stockholder action. In connection with the issuance of the Notes in May 2018 (Note 6), several of the Company’s founders agreed to modify their shares of common stock outstanding to include vesting provisions that require continued service to the Company in order to vest in those shares. As such, the 2,904,000 modified shares of common stock became compensatory upon such modification. The fair value of the awards on the modification date was determined to be $0.74 per share of common stock, by calibrating to the recent Notes issuance considering the maximum conversion price and the seniority of the Notes. The total compensation cost resulting from the modification was $2,126. The total compensation cost is being recognized over the three-year vesting term attendant to the founders’ common shares. During the year ended December 31, 2019, the Company recognized $529 and $177 of this amount in research and development expense and general and administrative expense, respectively. During the year ended December 31, 2018, the Company recognized $399 and $118 of this amount in research and development expense and general and administrative expense, respectively. Common stockholders are entitled to dividends, if and when declared by the board of directors, subject to the prior rights of the Convertible Preferred Stockholders. As of December 31, 2019, no dividends on common stock had been declared. Non-Voting Common Stock Election In October 2019, certain holders of the Company’s Convertible Preferred Stock elected to have such shares convert into 6,409,519 shares of non-voting Common Stock following the closing of the Company’s IPO. The non-voting shares of Common Stock shall have the same rights and preferences as the Common Stock, but shall be non-voting. 2018 Stock Option and Grant Plan In September 2018, the Company adopted the 2018 stock option and grant plan (the 2018 Plan), which provided for the Company to sell or issue common stock, or other stock-based awards, to employees, members of the board of directors and consultants of the Company. The 2018 Plan was administered by the board of directors, or at the discretion of the board of directors, by a committee of the board of directors. The exercise prices, vesting and other restrictions were determined at the discretion of the board of directors, or their committee if so delegated, except that the exercise price per share of stock options may not be less than 100% of the fair market value of the share of common stock on the date of grant and the term of stock option may not be greater than 10 years. The Company generally granted stock-based awards with service conditions only (service-based awards), although there has been one grant with performance conditions. Stock options granted under the 2018 Plan generally vest over three to four years. There were 1,959,411 options granted under the 2018 Plan prior to the plan termination upon consummation of the Company’s IPO in October 2019. 2019 Stock Option and Incentive Plan The 2019 Stock Option and Incentive Plan (2019 Plan) was approved by the Company’s board of directors on October 14, 2019, and became effective on October 23, 2019. The 2019 Plan provides for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock units, restricted stock awards, unrestricted stock awards, cash-based awards and dividend equivalent rights to the Company’s officers, employees, directors and consultants. The number of shares initially reserved for issuance under the 2019 Plan is 2,342,288, which shall be cumulatively increased on January 1, 2020 and each January 1 thereafter by 4% of the number of shares of the Company’s common stock outstanding on the immediately preceding December 31 or such lesser number of shares determined by the Company’s board of directors or compensation committee of the board of directors. 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 |
The aggregate intrinsic value of options granted is calculated as the difference between the exercise price of the options and the estimated fair value of the Company’s common stock. The weighted average grant-date fair value of stock options granted during the year ended December 31, 2019 and 2018 was $5.24 and $1.91, respectively. The aggregate grant-date fair value of options vested during the year ended December 31, 2019 and 2018 was $753 and $26, respectively. 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%
Black-Scholes requires the use of subjective assumptions which determine the fair value of stock-based awards. These assumptions include: Fair value of common stock—Historically, because there has been no public market for the Company’s common stock, the fair value of the Company’s common stock underlying stock-based awards was estimated on each grant date by the Company’s board of directors. In order to determine the fair value of the Company’s common stock underlying stock-based awards, the Company’s board of directors considered, among other things, a valuation of the Company’s common stock prepared by an unrelated third-party valuation firm in accordance with the guidance provided by the American Institute of Certified Public Accountants Practice Guide, Valuation of Privately-Held-Company Equity Securities Issued as Compensation. Expected term—The expected term represents the period that stock-based awards are expected to be outstanding. The expected term for option grants is determined using the simplified method. The simplified method deems the term to be the average of the time-to-vesting and the contractual life of the stock-based awards. Expected volatility—As a privately held company historically, the Company has limited trading history for its common stock and, as such, the expected volatility is estimated based on the average volatility for comparable publicly traded biotechnology companies over a period equal to the expected term of the stock-based awards. The comparable companies were chosen based on their similar size, stage in the life cycle or area of specialty. The Company will continue to apply this process until a sufficient amount of historical information regarding the volatility of its own stock price becomes available. Risk-free interest rate—The risk-free interest rate is based on the U.S. Treasury zero coupon issues in effect at the time of grant for periods corresponding with the expected term of a stock-based award. Expected dividend—The Company has never paid dividends on its common stock and has no plans to pay dividends on its common stock. Therefore, the Company used an expected dividend yield of zero. 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 |
As of December 31, 2019, there was $6,797 of unrecognized compensation cost related to unvested option awards, including $176 with respect to one grant with performance-based vesting terms, which is expected to be recognized over a weighted-average period of 2.2 years. As of December 31, 2019, there was $912 of unrecognized compensation cost related to unvested founder stock awards, which is expected to be recognized over a weighted-average period of 1.3 years. 2019 Employee Stock Purchase Plan The 2019 Employee Stock Purchase Plan (2019 ESPP) was approved by the Company’s board of directors on October 14, 2019, and became effective on October 23, 2019. A total of 234,229 shares of common stock were initially reserved for issuance under the 2019 ESPP, which shall be cumulatively increased on January 1, 2020 and each January 1 thereafter through January 1, 2029 by the least of (i) 234,229 shares of common stock, (ii) 1% of the number of shares of the Company’s common stock outstanding on the immediately preceding December 31 or (iii) such lesser number of shares determined by the 2019 ESPP’s administrator. The 2019 ESPP allows eligible employees to purchase shares during certain offering periods.

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- Definition The entire disclosure for shareholders' equity and share-based payment arrangement. Includes, but is not limited to, disclosure of policy and terms of share-based payment arrangement, deferred compensation arrangement, and employee stock purchase plan (ESPP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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