Summary of Significant Accounting Policies | 2. Summary of Significant Accounting Policies Basis of Presentation and Use of Estimates The accompanying consolidated financial statements have been prepared in accordance with GAAP. The preparation of the accompanying consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates. The accompanying unaudited condensed consolidated statement of financial position as of June 30, 2020 and the results of operations for the three and six months ended June 30, 2020 and cashflows for the six months ended June 30, 2020 include the accounts of Aravive, Inc. and its wholly-owned subsidiary Private Aravive. The accompanying unaudited condensed consolidated statement of financial position as of December 31, 2019, the results of operations for the three and six months ended June 30, 2019, and cash flows for the six months ended June 30, 2019 include the accounts of Aravive, Inc. and its wholly-owned subsidiaries, Versartis Cayman Holdings Company, incorporated in 2014, Versartis GmbH, incorporated in 2015 and Private Aravive, incorporated in 2007. After 2015, the Cayman and GmbH subsidiaries became dormant. In 2019, the Cayman and GmbH subsidiaries were liquidated in their respective countries and no longer exist as of December 31, 2019. All intercompany accounts and transactions have been eliminated. The U.S. dollar is the functional currency for all the Company's subsidiaries and consolidated operations. Liquidity and Capital Resources Since inception, the Company has incurred net losses and negative cash flows from operations. At June 30, 2020, the Company had an accumulated deficit of $486.0 million and working capital of $56.7 million. The Company expects to continue to incur losses from costs related to the development of AVB-500 and related administrative activities for the foreseeable future. As of June 30, 2020, the Company had a cash and cash equivalents balance of approximately $60.1 million consisting of cash and . Segments The Company operates in one segment. Management uses one measurement of performance and does not segregate its business for internal reporting. All long-lived assets are maintained in the United States of America. Concentration of credit risk Financial instruments that potentially subject the Company to a concentration of credit risk consist of cash and cash equivalents. All of the Company’s cash and cash equivalents are held at several financial institutions that management believes are of high credit quality. Such deposits may exceed federally insured limits. Risk and Uncertainties The Company’s future results of operations involve a number of risks and uncertainties. Factors that could affect the Company’s future operating results and cause actual results to vary materially from expectations include, but are not limited to, uncertainty of results of clinical trials and reaching milestones, including due to the COVID-19 pandemic, uncertainty of regulatory approval of the Company’s potential drug candidates, uncertainty of market acceptance of the Company’s products, competition from substitute products and larger companies, securing and protecting proprietary technology, strategic relationships and dependence on key individuals and sole source suppliers. Products developed by the Company require clearances from the FDA, the Pharmaceuticals Medicines and Devices Agency (“PMDA”), or other international regulatory agencies prior to commercial sales. There can be no assurance that the products will receive the necessary clearances. If the Company is denied clearance, clearance is delayed or the Company is unable to maintain clearance, it could have a material adverse impact on the Company. The Company expects to incur substantial operating losses for the next several years and will need to obtain additional financing in order to launch and commercialize any product candidates for which it receives regulatory approval. In March 2020, the World Health Organization declared COVID-19 a global pandemic. This contagious disease outbreak, which has continued to spread, and any related adverse public health developments, has adversely affected workforces, economies, and financial markets globally, potentially leading to an economic downturn. It has also disrupted the normal operations of many businesses. With the global spread of the ongoing COVID-19 pandemic in the first quarter of 2020, the Company has implemented business continuity plans designed to address and mitigate the impact of the COVID-19 pandemic on its business. The Company anticipates that the COVID-19 pandemic will have an impact on the clinical development timeline of AVB-500. The extent to which the COVID-19 pandemic impacts the Company’s business, the clinical development of AVB-500, the business of the Company’s suppliers and other commercial partners, the Company’s corporate development objectives and the value of and market for the Company’s common stock, will depend on future developments that are highly uncertain and cannot be predicted with confidence at this time, such as the ultimate duration of the pandemic, travel restrictions, quarantines, social distancing and business closure requirements in the United States, Europe and other countries, and the effectiveness of actions taken globally to contain and treat the disease. The global economic slowdown, the overall disruption of global healthcare systems and the other risks and uncertainties associated with the pandemic could have a material adverse effect on our business, financial condition, results of operations and growth prospects. In addition, to the extent the ongoing COVID-19 pandemic adversely affects the Company’s business and results of operations, it may also have the effect of heightening many of the other risks and uncertainties which the Company faces. On March 27, 2020, President Trump signed the Coronavirus Aid, Relief, and Economic Security (CARES) Act (“The Act”). The Act includes several significant business tax provisions that, among other things, eliminate the taxable income limit for certain net operating losses (NOL) and allow businesses and individuals to carry back NOLs arising in 2018, 2019, and 2020 to the five prior tax years; suspend the excess business loss rules under section 461(l); accelerate refunds of previously generated corporate alternative minimum tax (AMT) credits; generally loosen the business interest limitation under section 163(j) from 30 percent to 50 percent (special partnership rules apply); and fix the “retail glitch” for qualified improvement property in the 2017 tax code overhaul known informally as the Tax Cuts and Jobs Act (TCJA, P.L. 115-97). It also appropriated funds for the SBA Paycheck Protection Program loans that are forgivable in certain situations to promote continued employment, as well as Economic Injury Disaster Loans to provide liquidity to small businesses harmed by COVID-19. The Company has determined, based on its preliminary analysis, that the provisions of CARES Act are not expected to impact our 2020 financials. The Company will monitor the updates, both to our business as well as guidance issued with respect to CARES Act that could impact the current interpretation of the issued provisions. Cash and c e The Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. At June 30, 2020 and December 31, 2019, the Company’s cash and cash equivalents were held at multiple institutions in the United States and included deposits in money market funds which were unrestricted as to withdrawal or use. Restricted cash consists of a letter of credit to secure the Company’s obligations to the landlord under the right-of-use (“ROU”) lease for the property located at 1020 Marsh Road, Menlo Park, California (the “1020 Space”). Property and e Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the assets, generally between three and five years. Leasehold improvements are amortized on a straight-line basis over the lesser of their useful life or the term of the lease. Maintenance and repairs are charged to expense as incurred, and improvements are capitalized. When assets are retired or otherwise disposed of, the cost and accumulated depreciation are removed from the balance sheet and any resulting gain or loss is reflected in operations in the period realized. Leases The Company leases all of its office space in conducting its business. At inception, the Company determines whether an agreement represents a lease and at commencement the Company evaluates each lease agreement to determine whether the lease is an operating or financing lease. The Company records an operating lease ROU asset and an operating lease obligation on the consolidated balance sheet when entering into a lease. ROU assets represent the Company’s ROU of the underlying asset for the lease term and the lease obligation represents the Company’s commitment to make the lease payments arising from the lease. Lease obligations are recognized at the commencement date based on the present value of remaining lease payments over the lease term and ROU assets are calculated as the lease liability, adjusted by unamortized initial direct costs, unamortized lease incentives received, cumulative deferred or prepaid lease payments, and accumulated impairment losses. As the Company’s leases do not provide an implicit rate, the Company has used an estimated incremental borrowing rate based on the information available at the adoption date in determining the present value of lease payments. The lease term may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Operating lease expense is recognized on a straight-line basis over the lease term, subject to any changes in the lease or expectations regarding the terms. Variable lease costs such as common area costs and property taxes are expensed as incurred. Variable lease costs and short-term lease payments not included in the lease liability are classified within operating activities in the consolidated statements of cash flows. For all lease agreements, the Company has combined lease and nonlease components. Leases with an initial term of 12 months or less are not recorded on the consolidated balance sheet. These expenses are recognized within operating expenses in the consolidated statements of operations. Impairment of Long-Lived Assets The Company reviews property and equipment for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability is measured by the comparison of the carrying amount to the future net cash flows which the assets are expected to generate. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value (i.e. determined through estimating projected discounted future net cash flows or other acceptable methods of determining fair value) arising from the asset. There were no such impairments of long-lived assets as of December 31, 2019. The Company accounts for the sublease with EVA Automation, Inc. (“EVA”) as an operating lease and reviews the ROU asset recorded associated with the sublease for impairment whenever events or changes in circumstances indicate that the carrying amount of the ROU asset may not be recoverable in accordance with ASC 360-10. Recoverability is measured if the lease cost for the term of the sublease exceeds the anticipated sublease income for the same period on an undiscounted basis and the Company shall treat this circumstance as an indicator that the carrying amount of the ROU asset may not be recoverable. At the end of the first quarter ended March 31, 2020, the Company was informed by EVA, our sublease tenant, it will not be in a position to pay future sublease rental payments and intends to exit the sublease. Given the uncertainty of the sublease tenant’s ability to pay the remaining sublease rental payments, the Company determined the carrying amounts of the ROU asset and leasehold improvements associated with the 1020 Marsh Road facility may not be recoverable. Accordingly, the Company performed a recoverability test, using an undiscounted cash flow analysis as of March 31, 2020. Based on the undiscounted cash flow analysis, the Company determined that the ROU and leasehold improvement assets had net carrying values that exceeded their estimated undiscounted future cash flows. The Company then measured the impairment of the asset group using a discounted cash flow analysis of the estimated future sublease payments to be received from an expected sublessee as the Company is currently marketing the 1020 Marsh Road location for subletting. In determining the fair value of the asset group, the Company utilized current real estate market rates, time needed to sublet the building and estimated a discount rate of 9.5%. Fair Value of Financial Instruments The carrying value of the Company’s cash and cash equivalents, prepaid expenses, accounts payable and accrued liabilities approximate fair value due to the short-term nature of these items. Fair value is defined as the exchange price that would be received for an asset or an exit price paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy defines a three-level valuation hierarchy for disclosure of fair value measurements as follows: Level 1 Unadjusted quoted prices in active markets for identical assets or liabilities; Level 2 Inputs other than quoted prices included within Level Level 3 Unobservable inputs that are supported by little or no market activity for the related assets or liabilities. The categorization of a financial instrument within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. As of June 30, 2020 and December 31, 2019, the Company’s cash and cash equivalents consist solely of Level 1 assets. Level 1 assets are comprised of highly liquid money market funds. Preclinical and Clinical Trial Accruals The Company’s clinical trial accruals are based on estimates of patient enrollment and related costs at clinical investigator sites as well as estimates for the services received and efforts expended pursuant to contracts with multiple research institutions and CROs that conduct and manage clinical trials on the Company’s behalf. The Company estimates preclinical and clinical trial expenses based on the services performed, pursuant to contracts with research institutions and clinical research organizations that conduct and manage preclinical studies and clinical trials on its behalf. In accruing service fees, the Company estimates the time period over which services will be performed and the level of patient enrollment and activity expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, the Company will adjust the accrual accordingly. Payments made to third parties under these arrangements in advance of the receipt of the related services are recorded as prepaid expenses until the services are rendered. Research and d Research and development costs are charged to operations as incurred. Research and development costs include, but are not limited to, payroll and personnel expenses, laboratory supplies, consulting costs, external research and development expenses and allocated overhead, including rent, equipment depreciation, and utilities. Costs to acquire technologies to be used in research and development that have not reached technological feasibility and have no alternative future use are expensed to research and development costs when incurred. Income t The Company accounts for income taxes under the asset and liability approach. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company assesses all material positions taken in any income tax return, including all significant uncertain positions, in all tax years that are still subject to assessment or challenge by relevant taxing authorities. Assessing an uncertain tax position begins with the initial determination of the position’s sustainability and is measured at the largest amount of benefit that is greater than percent likely of being realized upon ultimate settlement. As of each balance sheet date, unresolved uncertain tax positions must be reassessed, and the Company will determine whether (i) the factors underlying the sustainability assertion have changed and (ii) the amount of the recognized tax benefit is still appropriate. The recognition and measurement of tax benefits requires significant judgment. Judgments concerning the recognition and measurement of a tax benefit might change as new information becomes available. Stock-Based c For stock options granted to employees, the Company recognizes compensation expense for all stock-based awards based on the grant-date estimated fair value. The value of the portion of the award that is ultimately expected to vest is recognized as expense ratably over the requisite service period. The fair value of stock options is determined using the Black-Scholes option pricing model. The determination of fair value for stock-based awards on the date of grant using an option pricing model requires management to make certain assumptions regarding a number of complex and subjective variables. Stock-based compensation expense related to stock options granted to nonemployees is recognized based on the fair value of the stock options, determined using the Black-Scholes option pricing model, as they are earned. The awards generally vest over the time period the Company expects to receive services from the nonemployee. Stock-based compensation expense, net of estimated forfeitures, is reflected in the condensed consolidated statements of operations as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Operating Expenses Research and development $ 135 $ 112 $ 256 $ 198 General and administrative 353 829 949 1,791 Total $ 488 $ 941 $ 1,205 $ 1,989 Net Loss per Share of Common Stock Basic net loss per common share is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common shares and potentially dilutive securities outstanding for the period. For purposes of the diluted net loss per share calculation, stock options and restricted stock units are considered to be potentially dilutive securities. Because the Company has reported a net loss for each of the three and six months ended June 30, 2020 and 2019, diluted net loss per common share is the same as basic net loss per common share for those periods. Intangible Asset Intangible assets consist of an assembled workforce which was acquired as part of the Merger. Intangible assets with definite lives are amortized based on their pattern of economic benefit over their estimated useful lives and reviewed periodically for impairment. The estimated useful life of the assembled workforce is 3 years. Recent Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) or other standard setting bodies and adopted by us as of the specified effective date. Unless otherwise discussed, the impact of recently issued standards that are not yet effective is not expected to have a material impact on the Company’s financial position or results of operations upon adoption. In December 2019, the FASB issued ASU 2019-12, Income Taxes The new guidance simplifies the accounting for income taxes by eliminating certain exceptions related to the approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period, hybrid taxes and the recognition of deferred tax liabilities for outside basis differences. It also clarifies and simplifies other aspects of the accounting for income taxes. For public companies, the amendments in this ASU are effective for fiscal years beginning after December 15, 2020 and interim periods within those fiscal years. Early adoption is permitted in interim or annual periods with any adjustments reflected as of the beginning of the annual period that includes that interim period. Additionally, entities that elect early adoption must adopt all the amendments in the same period. Amendments are to be applied prospectively, except for certain amendments that are to be applied either retrospectively or with a modified retrospective approach through a cumulative effect adjustment recorded to retained earnings. |