Summary of Significant Accounting Policies | 2. Summary of Significant Accounting Policies Basis of Presentation and Use of Estimates The accompanying interim condensed consolidated financial statements are unaudited and are comprised of the consolidation of CymaBay and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Company has no unconsolidated subsidiaries or investments accounted for under the equity method. These unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP, which requires management to make informed estimates and assumptions that impact the amounts and disclosures reported in the condensed consolidated financial statements and accompanying notes), and following the requirements of the United States Securities and Exchange Commission (SEC) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by GAAP can be condensed or omitted. In management’s opinion, the unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited financial statements and include normal recurring adjustments necessary for the fair presentation of the Company’s financial position and its results of operations and comprehensive loss and its cash flows for the periods presented. These statements do not include all disclosures required by GAAP and should be read in conjunction with the Company’s financial statements and accompanying notes for the fiscal year ended December 31, 2019, which is contained in the Company’s Annual Report on Form 10-K The condensed consolidated financial statements have been prepared in accordance with GAAP, which requires management to make estimates and assumptions that affect the amounts and disclosures reported in the condensed consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and on assumptions believed to be reasonable under the circumstances. The estimation process often may yield a range of potentially reasonable estimates of the ultimate future outcomes, and management must select an amount that falls within that range of reasonable estimates. Actual results could differ materially from those estimates and assumptions. The Company believes a high level of judgment is involved in determining and estimating the valuation of stock-based compensation, and accrued clinical expenses. These estimates form the basis for making judgments about the carrying values of assets and liabilities when these values are not readily apparent from other sources. Estimates are assessed each reporting period and updated to reflect current information and any changes in estimates will generally be reflected in the period first identified. Fair Value of Financial Instruments The Company’s financial instruments during the periods reported consist of cash and cash equivalents, marketable securities, accrued interest receivable, prepaid research and development expenses, other prepaid expenses, other assets, accounts payable, accrued research and development expenses, accrued restructuring, and other accrued liabilities. Fair value estimates of these instruments are made at a specific point in time based on relevant market information. These estimates may be subjective in nature and involve uncertainties and matters of significant judgment. The carrying amounts of financial instruments such as cash and cash equivalents, accrued interest receivable, prepaid research and development expenses, other prepaid expenses, other assets, accounts payable, and accrued expenses approximate the related fair values due to the short maturities of these instruments. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. Assets and liabilities that are measured at fair value are reported using a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. This hierarchy maximizes the use of observable inputs and maximizes the use of unobservable inputs and is as follows: Level 1—Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2—Inputs other than quoted prices in active markets that are observable for the asset or liability, either directly or indirectly. Level 3—Inputs that are significant to the fair value measurement and are unobservable (i.e. supported by little market activity), which requires the reporting entity to develop its own valuation techniques and assumptions. The following tables present the fair value of the Company’s financial assets and liabilities measured at fair value on a recurring basis using the above input categories (in thousands): As of March 31, 2020 Level 1 Level 2 Level 3 Total Fair Cash equivalents: Money market funds $ 53,147 $ — $ — $ 53,147 Total cash equivalents 53,147 — — 53,147 Marketable securities: U.S. and foreign commercial paper — 52,277 — 52,277 U.S. and foreign corporate debt securities — 31,008 — 31,008 Asset-backed securities — 18,069 — 18,069 U.S. treasury securities — 18,084 — 18,084 Total marketable securities — 119,438 — 119,438 Total assets measured at fair value $ 53,147 $ 119,438 $ — $ 172,585 As of December 31, 2019 Level 1 Level 2 Level 3 Total Fair Cash equivalents: Money market funds $ 18,597 $ — $ — $ 18,597 Total cash equivalents 18,597 — — 18,597 Marketable securities: U.S. and foreign commercial paper — 51,102 — 51,102 U.S. and foreign corporate debt securities — 56,729 — 56,729 Asset-backed securities — 39,788 — 39,788 U.S. treasury securities — 18,457 — 18,457 Total marketable securities — 166,076 — 166,076 Total assets measured at fair value $ 18,597 $ 166,076 $ — $ 184,673 The Company estimates the fair value of its money market funds, corporate debt, asset backed securities, commercial paper, and U.S. treasury securities by taking into consideration valuations obtained from third-party pricing services. The pricing services utilize industry standard valuation models, including both income and market-based approaches, for which all significant inputs are observable, either directly or indirectly, to estimate fair value. These inputs include reported trades of and broker/dealer quotes on the same or similar securities, issuer credit spreads; benchmark securities; prepayment/default projections based on historical data; and other observable inputs. Cash, Cash Equivalents and Marketable Securities The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of purchase to be cash equivalents. Cash and cash equivalents consist of deposits with commercial banks in checking, interest-bearing, demand money market accounts, and commercial paper. The Company invests excess cash in marketable securities with high credit ratings that are classified in Level 1 and Level 2 of the fair value hierarchy. These securities consist primarily of corporate debt, commercial paper, asset-backed securities, and U.S. treasury securities and are classified as “available-for-sale.” Realized gains and losses from the sale of marketable securities, if any, are calculated using the specific-identification method. Realized gains and losses and declines in value judged to be other-than-temporary are included in interest income or expense in the condensed consolidated statements of operations and comprehensive loss. Unrealized holding gains and losses are reported in accumulated other comprehensive loss in the condensed consolidated balance sheets. To date, the Company has not recorded any impairment charges on its marketable securities related to other-than-temporary declines in market value. In determining whether a decline in market value is other-than-temporary, various factors are considered, including the cause, duration of time and severity of the impairment, any adverse changes in the investees’ financial condition, and the Company’s intent and ability to hold the security for a period of time sufficient to allow for an anticipated recovery in market value. The following tables summarize amortized cost, unrealized gain and loss, and fair value of the Company’s available for sale marketable securities (in thousands): Gross Gross Amortized Unrealized Unrealized Total Cost Gains Losses Fair Value As of March 31, 2020: Cash equivalents: Money market funds $ 53,147 $ — $ — $ 53,147 Total cash equivalents 53,147 53,147 Short-term investments: U.S. and foreign commercial paper $ 52,278 $ — $ — $ 52,278 U.S. and foreign corporate debt securities 31,135 — (128 ) 31,007 Asset-backed securities 18,153 — (84 ) 18,069 U.S. treasury securities 18,003 81 — 18,084 Total short-term investments 119,569 81 (212 ) 119,438 Total marketable securities $ 172,715 $ 81 $ (212 ) $ 172,585 Gross Gross Amortized Unrealized Unrealized Total Cost Gains Losses Fair Value As of December 31, 2019: Cash equivalents: Money market funds $ 18,597 $ — $ — $ 18,597 Total cash equivalents 18,597 — — 18,597 Short-term investments: U.S. and foreign commercial paper $ 51,102 $ — $ — $ 51,102 U.S. and foreign corporate debt securities 56,691 38 — 56,729 Asset-backed securities 39,756 33 — 39,789 U.S. treasury securities 18,447 9 — 18,456 Total short-term investments 165,996 80 — 166,076 Total marketable securities $ 184,593 $ 80 $ — $ 184,673 Concentrations of Risk Cash, cash equivalents, and marketable securities consist of financial instruments that potentially subject the Company to a concentration of credit risk to the extent of the fair value recorded on the balance sheet. The Company invests cash that is not required for immediate operating needs primarily in highly liquid instruments that bear minimal risk. The Company has established guidelines relating to the quality, diversification, and maturities of securities to enable the Company to manage its credit risk. The Company is exposed to credit risk in the event of a default by the financial institutions holding its cash, cash equivalents and investments and issuers of investments to the extent recorded on the condensed consolidated balance sheets. Certain materials and key components that the Company utilizes in its operations are obtained through single suppliers. Since the suppliers of key components and materials must be named in an NDA filed with the FDA for a product, significant delays can occur if the qualification of a new supplier is required. If delivery of material from the Company’s suppliers were interrupted for any reason, the Company may be unable to supply any of its product candidates for clinical trials. Other Risks and Uncertainties In March 2020, the World Health Organization declared the global novel coronavirus disease (COVID-19) COVID-19 COVID-19 COVID-19 COVID-19 Leases The Company recognizes a lease asset for its right to use the underlying asset and a lease liability for the corresponding lease obligation. The Company determines whether an arrangement is or contains a lease at contract inception. Operating leases are included in operating lease right-of-use right-of-use The operating lease right-of-use non-lease non-lease Research and Development Expenses Research and development expenses consist of costs incurred in identifying, developing, and testing product candidates. These expenses consist primarily of costs for research and development personnel, including related stock-based compensation; contract research organizations (CRO) and other third parties that assist in managing, monitoring, and analyzing clinical trials; investigator and site fees; laboratory services; consultants; contract manufacturing services; non-clinical The Company records expenses related to clinical studies and manufacturing development activities based on its estimates of the services received and efforts expended pursuant to contracts with multiple CROs and manufacturing vendors that conduct and manage these activities on its behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract, and may result in uneven payment flows. There may be instances in which payments made to the Company’s vendors will exceed the level of services provided and result in a prepayment of the expense. Payments under some of these contracts depend on factors such as the successful enrollment of subjects and the completion of clinical trial milestones. In amortizing or accruing service fees, the Company estimates the time period over which services will be performed, enrollment of subjects, number of sites activated and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from the Company’s estimate, the Company will adjust the accrued or prepaid expense balance accordingly. To date, there have been no material differences from the Company’s estimates to the amounts actually incurred. Restructuring Charges The Company recognizes restructuring charges related to reorganization plans that have been committed to by management and when liabilities have been incurred. In connection with these activities, the Company records restructuring charges at fair value for, a) contractual employee termination benefits when obligations are associated to services already rendered, rights to such benefits have vested, and payment of benefits is probable and can be reasonably estimated, b) one-time One-time The recognition of restructuring charges requires the Company to make certain judgments and estimates regarding the nature, timing and amount of costs associated with the planned reorganization plan. To the extent the Company’s actual results differ from its estimates and assumptions, the Company may be required to revise the estimates of future accrued restructuring liabilities, requiring the recognition of additional restructuring charges or the reduction of accrued restructuring liabilities already recognized. Such changes to previously estimated amounts may be material to the consolidated financial statements. Changes in the estimates of the restructuring charges are recorded in the period the change is determined. At the end of each reporting period, the Company evaluates the remaining accrued restructuring balances to ensure that no excess accruals are retained, and the utilization of the provisions are for their intended purpose in accordance with developed restructuring plans. Stock-Based Compensation Employee and director stock-based compensation is measured at fair value on the grant date of the award. Compensation cost is recognized as expense on a straight-line basis over the vesting period for options and on an accelerated basis for stock options with performance conditions, net of estimated forfeitures. For stock options with performance conditions, the Company evaluates the probability of achieving performance conditions at each reporting date. The Company begins to recognize the expense when it is deemed probable that the performance conditions will be met. The Company uses the Black-Scholes option pricing model to determine the fair value of stock option awards. The determination of fair value for stock-based awards using an option-pricing model requires management to make certain assumptions regarding subjective input variables such as expected term, dividends, volatility and risk-free rate. The Company is also required to make estimates as to the probability of achieving the specific performance criteria. If actual results are not consistent with the Company’s assumptions and judgments used in making these estimates, the Company may be required to increase or decrease compensation expense, which could be material to the Company’s results of operations. Equity awards granted to non-employees 2018-07, Compensation—Stock Compensation Income Taxes On March 27, 2020, the President signed into law the Coronavirus Aid, Relief, and Economic Security Act, or the CARES Act, an economic stimulus package in response to the COVID-19 COVID-19-related 5-year Net Loss Per Common Share Basic net loss per share of common stock is based on the weighted average number of shares of common stock outstanding equivalents during the period. Diluted net loss per share of common stock is calculated as the weighted average number of shares of common stock outstanding adjusted to include the assumed exercises of stock options, if dilutive. In all periods presented, the Company’s outstanding stock options were excluded from the calculation of diluted net loss per share because their effects were antidilutive. The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per share amounts): Three Months Ended March 31, 2020 2019 Numerator: Net loss allocated to common stock—basic $ (13,088 ) $ (23,075 ) Net loss allocated to common stock—diluted $ (13,088 ) $ (23,075 ) Denominator: Weighted average number of common stock shares O 68,882,459 61,890,632 Weighted average number of common stock shares O 68,882,459 61,890,632 Net loss per share—basic: $ (0.19 ) $ (0.37 ) Net loss per share—diluted: $ (0.19 ) $ (0.37 ) The following table shows the total outstanding securities considered anti-dilutive and therefore excluded from the computation of diluted net loss per share (in thousands): Three Months Ended March 31, 2020 2019 Common stock options 6,117 7,349 Incentive awards 101 127 Total 6,218 7,476 Recently Adopted Accounting Pronouncements ASU 2018-18 In November 2018, the FASB issued ASU 2018-18, Clarifying the Interaction between Topic 808 and Topic 606 ASU 2018-15 In August 2018, the FASB issued ASU No. 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract internal-use ASU 2018-13 In August 2018, the FASB issued ASU 2018-13, Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement Recently Issued Accounting Pronouncements ASU 2016-13 In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments available-for-sale 2019-10, ASU 2019-12 In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes step-up |