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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation In January 2020, the Company’s board of directors approved the 2020 Equity Incentive Plan, (2020 Plan), which became effective January 30, 2020 in connection with the IPO. The 2020 Plan serves as the successor incentive award plan to the Company’s 2017 Equity Incentive Plan, (2017 Plan), and has 2,134,000 shares of
common stock available for issuance pursuant to a variety of stock-based compensation awards, including stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards and other stock-based awards, plus 1,550,150 shares of common stock that were reserved for issuance pursuant to future awards under the 2017 Plan at the time the 2020 Plan became effective, plus shares represented by awards outstanding under the 2017 Plan that are forfeited or lapsed unexercised and which following the effective date of the 2020 Plan are not issued under the 2017 Plan. In addition, the 2020 Plan reserve will increase on January 1, 2021 and each subsequent anniversary through 2030, by an amount equal to the lesser of (a) four percent of the shares of stock outstanding (on an as converted basis) on the day immediately prior to the date of increase and (b) such smaller number of shares of stock as determined by our board of directors; provided, however, that no more than 11,000,000 shares of stock may be issued upon the exercise of incentive stock options. As of September 30, 2020, the Company had 2,280,765 shares available for future grant under the 2020 Plan.
The 2020 Plan provides for the Company to sell or issue common stock or restricted common stock, or to grant incentive stock options or nonqualified stock options for the purchase of common stock, to employees, members of the board of directors and consultants of the Company under terms and provisions established by the board of directors. Under the terms of the 2020 Plan, options may be granted at an exercise price not less than fair market value. The Company generally grants stock-based awards with service conditions. Options granted typically vest over a four-year period but may be granted with different vesting terms.
Following the Company’s IPO and in connection with the effectiveness of the Company’s 2020 Plan, the 2017 Plan terminated and no further awards will be granted under that plan. However, all outstanding awards under the 2017 Plan will continue to be governed by their existing terms.
Stock Option Activity
The following summarizes option activity (in thousands, except share amounts):
Number of
Options
Weighted-
Average
Exercise
Price
Remaining
Contractual
Term
(Years)
Aggregate
Intrinsic
Value
Balance—December 31, 20192,516,470 $3.47 9.44$7,673 
Granted1,263,825 $27.14 
Exercised(151,932)$2.07 
Forfeited(24,000)$27.61 
Balance—September 30, 20203,604,363 $11.67 9.01$64,019 
Exercisable—September 30, 20201,972,132 (1)$7.37 8.80$43,245 
______________
(1)Options exercisable includes early exercisable options.
The aggregate intrinsic value is calculated as the difference between the exercise price of the options and the fair value of the Company’s common stock as of September 30, 2020. As of December 31, 2019, prior to the Company's IPO, the estimated fair value of the Company's common stock was determined by the board of directors.
The intrinsic value of options exercised for the nine months ended September 30, 2020 was $2.6 million.
The total grant-date fair value of the options vested during the nine months ended September 30, 2020 was $1.6 million. The weighted-average grant-date fair value of employee options granted during the nine months ended September 30, 2020 was $18.35.
Restricted Stock Unit Activity
The following table summarizes information regarding our restricted stock units (RSUs):
Number of UnitsWeighted-Average
Grant Date Fair Value
Balance—December 31, 2019— $— 
Granted163,560 $27.26 
Vested— $— 
Forfeited— $— 
Unvested Balance—September 30, 2020163,560 $27.26 
The grant date fair value of an RSU equals the closing price of our common stock on the grant date. RSUs generally vest equally over 4 years. There were no RSU grants prior to January 1, 2020.

Stock-Based Compensation Expense
Stock-based compensation expense recognized in our condensed statements of operations and comprehensive loss was as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Research and development
$1,067 $57 $2,209 $146 
General and administrative
1,194 82 3,091 223 
Total stock-based compensation expense
$2,261 $139 $5,300 $369 
As of September 30, 2020, there was $23.8 million of total unrecognized compensation cost related to unvested options that are expected to vest, which is expected to be recognized over a weighted-average period of 3.4 years. As of September 30, 2020, there was $3.9 million of total unrecognized compensation cost related to RSUs that is expected to vest, which is expected to be recognized over a weighted-average period of 3.8 years.
In determining the fair value of the stock options granted, the Company uses the Black-Scholes option-pricing model and assumptions discussed below. Each of these inputs is subjective and generally requires significant judgment.
Fair value of common stock—For options granted prior to IPO in the year ended December 31, 2019, given the absence of a public trading market, the Company’s board of directors with input from management considered numerous objective and subjective factors to determine the fair value of common stock. The factors included, but were not limited to: (i) third-party valuations of the Company’s common stock; (ii) the Company’s stage of development; (iii) the status of research and development efforts; (iv) the rights, preferences and privileges of the Company’s convertible preferred stock relative to those of the Company’s common stock; (v) the Company’s operating results and financial condition, including the Company’s levels of available capital resources; and (vi) equity market conditions affecting comparable public companies; (vii) general U.S. market conditions; and (viii) the lack of marketability of the Company’s common stock. For options granted after IPO, the Company uses its closing stock price as reported on Nasdaq on the grant date for the fair value of its stock.
Expected Term—The Company’s expected term represents the period that the Company’s stock-based awards are expected to be outstanding. The Company used the simplified method (based on the mid-point between the vesting date and the end of the contractual term) to determine the expected term.
Expected Volatility—Since the Company does not have sufficient trading history for its common stock, the expected volatility was estimated based on the average historical volatilities for comparable publicly traded pharmaceutical companies over a period equal to the expected term of the stock option grants. The comparable companies were chosen based on their similar size, stage in the life cycle and 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 option.
Dividend Yield—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.
The fair value of stock option awards granted was estimated at the date of grant using a Black-Scholes option-pricing model with the following assumptions:
Nine Months Ended
September 30, 2020		Year Ended
December 31, 2019
Expected term (in years)
5.5 – 6.2
5.1 – 6.6
Expected volatility
78.4 – 80.8%
68.6 – 72.5%
Risk-free interest rate
0.3 – 1.4%
1.6 – 2.6%
Dividend yield
—%—%
Early Exercise of Employee Options
The terms of the 2017 and 2020 Plans permit certain option holders to exercise options before their options are vested, subject to certain limitations. Upon early exercise, the awards become subject to a restricted stock agreement. The shares of restricted stock granted upon early exercise of the options are subject to the same vesting provisions in the original stock option awards. Shares issued as a result of early exercise that have not vested are subject to repurchase by the Company upon termination of the purchaser’s employment, at the price paid by the purchaser. While such shares have been issued, they are not considered outstanding for accounting purposes until they vest and are therefore excluded from shares used in determining loss per share until the repurchase right lapses and the shares are no longer subject to the repurchase feature. The liability is reclassified into common stock and additional paid-in capital as the shares vest and the repurchase right lapses. Accordingly, the Company has recorded the unvested portion of the exercise proceeds of $311,000 and $409,000 as a liability from the early exercise in the accompanying balance sheets as of September 30, 2020 and December 31, 2019, respectively. As of September 30, 2020 and December 31, 2019, there were $198,000 and $225,000 recorded in accrued liabilities, respectively, and $113,000 and $184,000 recorded in other long-term liabilities, respectively related to shares that were subject to repurchase.
Founder Awards
In August 2016, the Company issued 1,187,738 shares of restricted common stock to founders of which 1,102,903 shares vest under a service condition and 84,835 shares vest under a performance condition. The shares were issued under the terms of the respective restricted stock purchase agreements, or the Stock Purchase Agreement, and unvested shares were subject to repurchase by the Company at the original purchase price per share upon the holder’s termination of his relationship with the Company. The restricted shares were not considered outstanding for accounting purposes until they vested and are therefore excluded from shares used in determining loss per share until the repurchase right lapses and the shares are no longer subject to the repurchase feature. One-fourth of the 1,102,903 shares of restricted common stock were vested on the first-anniversary date and the remaining 827,177 shares will vest on a monthly basis thereafter. In July 2018, performance conditions prescribed by the Stock Purchase Agreement were met and 84,835 shares of the restricted common stock were fully vested. As of December 31, 2019, 1,049,875 shares subject to the award had vested, and an additional 137,863 shares vested during the nine months ended September 30, 2020. As of September 30, 2020, all shares of restricted stock subject to the award had been vested.
2020 Employee Stock Purchase Plan
The Company adopted the 2020 Employee Stock Purchase Plan, or the ESPP, which became effective on January 30, 2020 in connection with the IPO. The ESPP is designed to allow the Company’s eligible employees to purchase shares of the Company’s common stock, at semi-annual intervals, with their accumulated payroll
deductions. Under the ESPP, participants are offered the option to purchase shares of the Company’s common stock at a discount during a series of successive offering periods. The option purchase price will be the lower of 85% of the closing trading price per share of the Company’s common stock on the first trading date of an offering period in which a participant is enrolled or 85% of the closing trading price per share on the purchase date, which will occur on the last trading day of each offering period.
The ESPP is intended to qualify under Section 423 of the U.S. Internal Revenue Service Code of 1986, as amended. The maximum number of the Company’s common stock which will be authorized for sale under the ESPP is equal to the sum of (a) 351,000 shares of common stock and (b) an annual increase on the first day of each year beginning in 2021 and ending in 2030, equal to the lesser of (i) 1% of the shares of common stock outstanding (on an as converted basis) on the last day of the immediately preceding fiscal year and (ii) such number of shares of common stock as determined by the Company’s board of directors; provided, however, no more than 5,265,000 shares of the Company’s common stock may be issued under the ESPP.
The Company commenced an offering period on January 31, 2020, which ended on May 31, 2020, and resulted in 19,862 shares of stock being issued under the ESPP during the six months ended June 30, 2020. Subsequently, the Company commenced another offering period on June 1, 2020, which will end on November 30, 2020. Stock-based compensation expense related to the ESPP was $88,000 and $249,000 for the three and nine months ended September 30, 2020, respectively.