Summary of Significant Accounting Policies | 2. Summary of Significant Accounting Policies Condensed Financial Statements (Unaudited) The financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and applicable rules and regulations of the U.S. Securities and Exchange Commission (SEC) for interim reporting. As permitted under those rules and regulations, certain footnotes or other financial information normally included in financial statements prepared in accordance with GAAP have been condensed or omitted. The interim condensed financial statements have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal, recurring adjustments that are necessary to present fairly the Company’s results for the interim periods presented. The condensed balance sheet as of December 31, 2020, is derived from the Company’s audited financial statements. The results of operations during the three months ended March 31, 2021, are not necessarily indicative of the results to be expected for the year ending December 31, 2021, or for any other future annual or interim period. The accompanying interim unaudited condensed financial statements should be read in conjunction with the audited financial statements and the related notes thereto for the year ended December 31, 2020, which are included in the Company’s Annual Report on Form 10-K, filed with the SEC on March 19, 2021. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company bases its estimates on historical experience and market-specific or other relevant assumptions that it believes are reasonable under the circumstances. Assets and liabilities reported in the Company’s condensed balance sheet and expenses and income reported are affected by estimates and assumptions, which are used for, but are not limited to, estimating research and development expenses and determining the fair value of assets and liabilities, including common stock valuation, income tax uncertainties, and measurement of stock-based compensation expense. The Company assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to the Company and the unknown future impacts of the COVID-19 pandemic. Actual results could differ from such estimates or assumptions. Concentration of Credit Risk and Other Risks and Uncertainties Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, and investments. The Company invests in U.S. Treasury securities. The Company maintains bank deposits in federally insured financial institutions and these deposits may exceed federally insured limits. The Company is exposed to credit risk in the event of default by the financial institutions holding its cash, cash equivalents, and investments to the extent recorded in the condensed balance sheet. The Company has not experienced any losses on its deposits of cash, cash equivalents, and investments. The Company is subject to a number of risks similar to other early-stage biopharmaceutical companies, including, but not limited to, the need to obtain adequate additional funding, possible failure of current or future preclinical studies or clinical trials, its reliance on third parties to conduct its clinical trials, the need to obtain regulatory and marketing approvals for its product candidates, competitors developing new technological innovations, the need to successfully commercialize and gain market acceptance of the Company’s product candidates, protection of its proprietary technology, and the need to secure and maintain adequate manufacturing arrangements with third parties. If the Company does not successfully commercialize or partner any of its product candidates, it will be unable to generate product revenue or achieve profitability. Operating Segment The Company operates and manages its business as one reportable and operating segment, which is the business of designing and developing a pipeline of novel oral biologic product candidates to treat autoimmune, inflammatory, metabolic, and other diseases. The Company’s chief executive officer, who is the chief operating decision maker, reviews financial information on an aggregate basis for allocating and evaluating financial performance. Cash and Cash Equivalents Cash and cash equivalents are held in accounts at financial institutions. Such deposits have and will continue to exceed federally insured limits in the foreseeable future. The Company considers all highly liquid investments purchased with original maturities of 90 days or less from the purchase date to be cash equivalents. Cash equivalents consist of amounts invested in money market funds exclusively composed of U.S. government obligations. Restricted Cash The Company has cash in two collateral accounts related to letters of credit issued on behalf of the Company for the security deposits on the leased and subleased properties in South San Francisco. As of March 31, 2021, the collateralized cash in connection with the letter of credit was classified as restricted cash on the condensed balance sheet based on the terms of the agreements. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed statements of cash flows (in thousands): March 31, March 31, 2021 2020 Cash and cash equivalents $ 26,202 $ 5,967 Restricted cash 1,025 108 Total cash, cash equivalents and restricted cash $ 27,227 $ 6,075 Investments The Company’s investments have been classified and accounted for as available-for-sale securities. Fixed income securities consist of U.S. Treasury securities. The specific identification method is used to determine the cost basis of fixed income securities sold. These securities are recorded on the condensed balance sheets at fair value. Unrealized gains and losses on these securities are included as a separate component of accumulated other comprehensive income or loss. The cost of investment securities is adjusted for amortization of premiums and accretion of discounts to maturity. Such amortization and accretion are included in other income or expense, net. The Company classifies its investments as short or long term primarily based on the remaining contractual maturity of the securities. Property and Equipment, Net Property and equipment are presented at cost, net of accumulated depreciation. Depreciation is recorded using the straight-line method. Depreciation begins at the time the asset is placed in service. Maintenance and repairs are charged to expense as incurred and costs of major replacement or improvement are capitalized. The Company’s estimated useful lives of its property and equipment are as follows: Laboratory and manufacturing equipment 5 years Computer and office equipment 3 years Leasehold improvements Shorter of remaining lease term or estimated useful life Impairment of Long-Lived Assets The Company evaluates the carrying amount of its long-lived assets whenever events or changes in circumstances indicate that the assets may not be recoverable. An impairment loss is recognized when the remaining book value of an asset is not recoverable. There was no impairment on long-lived assets during the three months ended March 31, 2021 and March 31, 2020. Leases In February 2016, the Financial Accounting Standards Board (FASB) issued a new standard that requires lessees to recognize leases on the balance sheet and disclose key information about leasing arrangements. The Company adopted the new standard on January 1, 2021 using the modified retrospective approach. The new standard establishes a right-of-use (ROU) model that requires a lessee to recognize a ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the condensed statements of operations and comprehensive loss. At the inception of an arrangement, the Company determines if an arrangement is, or contains, a lease based on the facts and circumstances present in that arrangement. Lease classification, recognition, and measurement are then determined at the lease commencement date. For arrangements that contain a lease, the Company (i) identifies lease and non-lease components, (ii) determines the consideration in the contract, (iii) determines whether the lease is an operating or finance lease; and (iv) recognizes lease ROU assets and liabilities. Lease liabilities and their corresponding ROU assets are recorded based on the present value of lease payments over the expected lease term. The interest rate implicit in lease contracts is typically not readily determinable and as such, the Company uses the incremental borrowing rate based on the information available at the lease commencement date, which represents an internally developed rate that would be incurred to borrow, on a collateralized basis, over a similar term, an amount equal to the lease payments in a similar economic environment. Most leases include options to renew and, or terminate the lease, which can impact the lease term. The exercise of these options is at the Company’s discretion. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options. The Company has operating leases for its corporate offices, laboratory and warehouse facilities, and a contract research organization (CRO) embedded lease arrangement. Fixed lease payments on operating leases are recognized over the expected term of the lease on a straight-line basis. Variable lease expenses that are not considered fixed are recognized as incurred. Fixed and variable lease expense on operating leases is recognized within operating expenses within our condensed statements of operations and comprehensive loss. The Company has finance leases for lab equipment. Fixed payments on finance leases are recognized using the effective interest method. Finance lease ROU asset amortization and interest expense are recorded within operating expenses and interest income, net, respectively, within our condensed statements of operations and comprehensive loss. The Company has elected the short-term lease exemption and, therefore, does not recognize an ROU asset or corresponding liability for lease arrangements with an original term of 12 months or less. Research and Development Expenses Research and development expenses are expensed as incurred. Research and development expenses include personnel costs related to research and development activities, materials costs, external clinical drug product manufacturing and clinical trial costs, outside services costs, repair, maintenance and depreciation costs for research and development equipment, as well as facility costs for laboratory space used for research and development activities. Accrued Research and Development Expenses The Company records accruals for estimated costs of research, preclinical studies, clinical trials, manufacturing and development, within accrued expenses which are significant components of research and development expenses. A substantial portion of the Company’s ongoing research and development activities is conducted by third-party service providers, CROs and contract development and manufacturing organizations (CDMOs). The Company’s contracts with the CROs and CDMOs generally include fees such as clinical trial fees, initiation fees, reservation fees, costs related to animal studies and safety tests, verification run costs, materials and reagents expenses, taxes, etc. The financial terms of these contracts are subject to negotiations, which vary from contract to contract and may result in payment flows that do not match the periods over which materials or services are provided to the Company under such contracts. The Company accrues the costs incurred under agreements with these third parties based on estimates of actual work completed in accordance with the respective agreements. The Company determines the estimated costs through discussions with internal personnel and external service providers as to the progress, stage of completion or actual timeline (start-date and end-date) of the services and the agreed-upon fees to be paid for such services. If the actual timing of the performance of services or the level of effort varies from the estimate, the Company adjusts accrued expenses or prepaid expenses accordingly, which impact research and development expenses. Although the Company does not expect its estimates to be materially different from amounts actually incurred, the Company’s understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and may result in reporting amounts that are too high or too low in any particular period. To date, there have not been any material adjustments to the Company’s prior estimates of research and development expenses. Stock-Based Compensation Expense The Company maintains both an equity incentive plan and an employee stock purchase plan (ESPP) as long-term incentives for its employees, consultants, and directors. The equity incentive plan allows for the issuance of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock grants, and restricted stock units. The ESPP has an offering period of two years comprised of four purchase periods. The ESPP allows employees to purchase shares of the Company’s common stock each purchase period based on a percentage of their compensation subject to certain limits. As of March 31, 2021, no stock appreciation rights, restricted stock grants, restricted stock units or performance-based awards were issued. The Company accounts for stock-based compensation expense by measuring and recognizing compensation expense for all share-based payments made to employees and non-employees based on estimated grant-date fair values. The grant-date fair values for options are recorded as stock-based compensation expense on a straight-line basis over each recipient’s requisite service period, which is generally the vesting period. The grant-date fair values for the ESPP are recorded as stock-based compensation expense on a straight-line basis over the applicable purchase period. The Company recognizes actual forfeitures by reducing the stock-based compensation expense in the same period as that forfeitures occur. The Company estimates the fair value of stock options granted to employees and non-employees using the Black-Scholes model. The Company estimates the fair value of ESPP for each purchase period at the beginning of the offering period using the Black-Scholes model. The Black-Scholes model requires the input of assumptions, including expected volatility, expected dividend yield, expected term and the risk-free rate of return. The fair value of ESPP also factors in a discount which is typically 15% of the purchase price as well as a call output and a put output of the Black-Scholes model. Fair Value Measurement Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability, or an exit price, in the principal or most advantageous market for that asset or liability in an orderly transaction between market participants on the measurement date. Fair value measurement establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. The Company determined the fair value of financial assets and liabilities using the fair value hierarchy that describes three levels of inputs that may be used to measure fair value, as follows: ▪ Level 1—Quoted prices in active markets for identical assets and liabilities; ▪ Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and ▪ Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. As of March 31, 2021 and December 31, 2020, fair value measurements consisted mainly of cash equivalents and investments. The carrying amounts of these instruments approximate their fair value. Comprehensive Loss Comprehensive loss includes net loss and other comprehensive (loss) income for the period. Other comprehensive (loss) income represents unrealized (loss) or gain on investments. Deferred Offering Costs Deferred offering costs, consisting of legal, accounting and filing fees, are capitalized and subsequently offset against offering proceeds. During the three months ended March 31, 2021, $0.7 million of deferred offering costs were incurred in connection with the Company’s follow-on offering which is described in Note 10. Emerging Growth Company Status The Company is an emerging growth company (EGC) as defined in the Jumpstart Our Business Startups Act of 2012 (JOBS Act) and may take advantage of reduced reporting requirements that are otherwise applicable to public companies. Section 107 of the JOBS Act exempts EGCs from being required to comply with new or revised financial accounting standards until private companies are required to comply with those standards. The Company has elected to use the extended transition period for complying with new or revised accounting standards. Commitments and Contingencies Liabilities for loss contingencies arising from claims, assessments, litigation, fines, and penalties and other sources are recorded if and when it is probable that a liability has been incurred and the amount can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred. Recent Accounting Pronouncements From time to time, new accounting pronouncements are issued by the FASB or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed, the impact of recently issued standards that are not yet effective will not have a material impact on the Company’s financial position or results of operations upon adoption. Recently Adopted Accounting Pronouncements In February 2016, the FASB issued Accounting Standards Update (ASU) 2016-02, Leases (Topic 842) The Company adopted the new standard on January 1, 2021 using the modified retrospective approach. The Company has elected to apply the transition method that allows companies to continue applying the guidance under the lease standard in effect at that time in the comparative periods presented in the condensed financial statements and recognize a cumulative-effect adjustment to the opening balance of accumulated deficit on the date of adoption. The Company has elected to combine lease components (for example fixed rent payments) with non-lease components (for example, common-area maintenance costs) on our facility, lab equipment and CRO embedded lease asset classes. The Company also elected the “package of practical expedients”, which permits the Company not to reassess under the new standard the Company’s prior conclusions about lease identification, lease classification and initial direct costs. Lastly, the Company elected a practical expedient to use hindsight in determining the lease term for all its leases. Results for reporting period beginning after January 1, 2021 are presented under the new standard, while prior period amounts are not adjusted and continue to be reported under the accounting standards in effect for the prior period. Upon adoption of the new lease standard, on January 1, 2021, the Company capitalized operating lease ROU assets of $6.0 million, with opening adjustments of $0.5 million related to deferred rent existing at transition, and $6.5 million of operating lease liabilities, within our condensed balance sheets upon adoption. There was no impact to the finance lease ROU asset and the finance lease liabilities upon adoption. Also, for both operating and finance leases, there was no impact to the accumulated deficit upon the adoption of the new standard on January 1, 2021. In October 2020, the FASB issued ASU 2020-10, Codification Improvements |