The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our unaudited condensed financial statements and related notes included in this Quarterly Report on Form 10-Q, or Quarterly Report, and the audited financial statements and notes thereto as of and for the fiscal year ended December 31, 2020 and the related Management's Discussion and Analysis of Financial Condition and Results of Operations, both of which are contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020 filed with the Securities and Exchange Commission, or SEC, on February, 24, 2021.

This Quarterly Report includes forward-looking statements and information within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, which are subject to the "safe harbor" created by those sections, that involve a number of risks, uncertainties and assumptions. These forward-looking statements can generally be identified as such because the context of the statement will include words such as "may," "will," "intend," "plan," "believe," "anticipate," "expect," "seek", "estimate," "predict," "potential," "continue," "likely," or "opportunity," the negative of these words or other similar words. Similarly, statements that describe our plans, strategies, intentions, expectations, objectives, goals or prospects and other statements that are not historical facts are also forward-looking statements. For such statements, we claim the protection of the Private Securities Litigation Reform Act of 1995. Readers of this Quarterly Report are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the time this Quarterly Report was filed with the SEC. These forward-looking statements are based largely on our expectations and projections about future events and future trends affecting our business, and are subject to risks and uncertainties that could cause actual results to differ materially from those anticipated in the forward-looking statements. These risks and uncertainties include, without limitation, the risk factors identified in our SEC reports, including this Quarterly Report. In addition, past financial or operating performance is not necessarily a reliable indicator of future performance, and you should not use our historical performance to anticipate results or future period trends. We can give no assurances that any of the events anticipated by the forward-looking statements will occur or, if any of them do, what impact they will have on our results of operations and financial condition. Except as required by law, we undertake no obligation to update publicly or revise our forward-looking statements.

References to "we," "us" and "our" refer to Kura Oncology, Inc.

Overview

We are a clinical-stage biopharmaceutical company committed to realizing the promise of precision medicines for the treatment of cancer. Our pipeline consists of small molecule product candidates that target cancer signaling pathways where there is a strong scientific and clinical rationale to improve outcomes, and we intend to pair them with molecular or cellular diagnostics to identify those patients most likely to respond to treatment. We presently have two clinical-stage product candidates for which we own global commercial rights, tipifarnib and KO-539, as well as additional programs that are at a discovery stage. We plan to advance our product candidates through a combination of internal development and strategic partnerships while maintaining significant development and commercial rights.

Our first product candidate, tipifarnib, is a potent, selective and orally bioavailable inhibitor of farnesyl transferase that has been previously studied in more than 5,000 cancer patients and demonstrated compelling and durable anti-cancer activity in certain patients with a manageable side effect profile. We are currently evaluating tipifarnib in multiple solid tumor and hematologic indications.

Our most advanced solid tumor indication for tipifarnib is in patients with head and neck squamous cell carcinoma, or HNSCC, that carry mutations in the HRAS gene. In September 2017, we reported that our ongoing proof-of-concept Phase 2 clinical trial of tipifarnib in patients with HRAS mutant relapsed or refractory HNSCC, or RUN-HN, achieved its primary efficacy endpoint. In October 2018, we reported updated data from RUN-HN showing a significant association between tumor HRAS mutant allele frequency and clinical benefit from tipifarnib. Based upon these observations, we introduced a minimum HRAS mutant variant allele frequency as an entry criterion in the RUN-HN trial. Following feedback from the U.S. Food and Drug Administration, or the FDA, and other regulatory authorities, we initiated a global, multi-center, open-label, non-comparative registration-directed clinical trial of tipifarnib in HRAS mutant HNSCC in November 2018. The clinical trial has two cohorts: a treatment cohort, which we call AIM-HN, and a non-interventional screening and outcomes cohort, which we call SEQ-HN. AIM-HN is designed to enroll at least 59 evaluable HNSCC patients with high HRAS mutant variant allele frequency who have received prior platinum-based therapy. In October 2019, we reported updated data from the ongoing RUN-HN trial that we believe confirms the association between HRAS mutant variant allele frequency and



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anti-tumor activity, and we believe further supports the design of our amended AIM-HN registration-directed trial in HRAS mutant HNSCC. On December 16, 2019, we reported that the FDA granted Fast Track Designation to tipifarnib for the treatment of patients with HRAS mutant HNSCC after progression on platinum therapy. On May 29, 2020, we announced updated clinical data for our RUN-HN study presented at the American Society of Clinical Oncology Virtual Scientific Program, including data collected as part of the trial showing a median overall survival of 15.4 months, a median progression free survival of 5.9 months and an objective response rate, or ORR, of 50% observed in patients with recurrent/metastatic HRAS mutant HNSCC among the 18 patients on the RUN-HN study who were evaluable for efficacy.

In July 2020, we amended the AIM-HN trial protocol to enable enrollment of patients with any HRAS mutation in order to assess the potential for clinical benefit in the overall HRAS mutant HNSCC population. We also introduced a number of modifications to the protocol that seek to enable us to enroll patients in the study more efficiently as well as modifications that we believe better reflected the evolving standards of care for recurrent/metastatic HNSCC. While these amendments do not change the primary outcome measure of ORR in patients with high HRAS mutant variant allele frequency, the modifications will require us to enroll an increased number of evaluable HNSCC patients. As a result of the pandemic caused by the coronavirus disease 2019, or COVID-19, and the additional patients required for the trial, we anticipate we will face delays in our timelines and milestones for the AIM-HN trial and, accordingly, are unable to reasonably forecast when our AIM-HN trial will become fully enrolled.

On February 24, 2021, we announced that tipifarnib has been granted Breakthrough Therapy Designation from the FDA for the treatment of patients with recurrent or metastatic HRAS mutant head and neck squamous cell carcinoma with variant allele frequency ? 20% after disease progression on platinum-based chemotherapy. The Breakthrough Therapy Designation is based upon data from our Phase 2 RUN-HN trial, which has been accepted for publication in an upcoming issue of the Journal of Clinical Oncology, or JCO, and was published online by JCO ahead of print on March 22, 2021.

In addition to evaluating tipifarnib as a monotherapy in patients with recurrent or metastatic HRAS mutant HNSCC, we have also been evaluating the use of tipifarnib in combination with other oncology therapeutics to address larger patient populations and to pursue earlier lines of therapy. Among these potential combinations, we have prioritized the combination of tipifarnib and an inhibitor of the PI3 Kinase alpha enzyme for clinical evaluation in patients with HNSCC. In particular, we are planning to commence a Phase 1/2 open-label, biomarker-defined cohort study in the second half of 2021 to evaluate the safety and tolerability of the combination, determine the recommended dose and schedule for the combination, and assess early antitumor activity of tipifarnib and a PI3 kinase alpha inhibitor for the treatment of adult participants who have HRAS-overexpressing, PIK3CA-mutated and/or PIK3CA-amplified HNSCC.

While we believe tipifarnib has potential to modulate the CXCR4-expressing primary tumor cells in AITL, PTCL and other diseases such as relapsed or refractory acute myeloid leukemia, or AML, chronic myelomonocytic leukemia, or CMML, diffuse large B-cell lymphoma, cutaneous T-cell lymphoma and pancreatic cancer, we suspended the initiation of a planned registration directed study for tipifarnib in T-cell lymphoma and of a planned Phase 2 clinical trial for tipifarnib in pancreatic cancer as a result of a strategic review conducted in the spring of 2020. We have continued preclinical work to validate tipifarnib in the CXCR4 receptor pathway and to assess the timing and strategy for further development.

Our second product candidate, KO-539, is a potent, selective, reversible and oral small molecule inhibitor of the mixed-lineage leukemia 1, or MLL1, gene (now renamed Lysine K-specific Methyltransferase 2A, or KMT2A), or menin-KMT2A, protein-protein interaction. We have generated preclinical data that support the potential anti-tumor activity of KO-539 in genetically defined subsets of acute leukemia, including those with rearrangements or partial tandem duplications in the KMT2A gene as well as those with oncogenic driver mutations in genes such as nucleophosmin 1, or NPM1. The novel mechanism of action targets epigenetic dysregulation and removes a key block to cellular differentiation to drive anti-tumor activity. We believe KO-539 has the potential to address approximately 35% of acute myeloid leukemia, or AML, including NPM1-mutant AML and KMT2A-rearranged AML. In the pediatric population, KMT2A-rearranged leukemias make up approximately 10% of acute leukemias in all age groups and in the case of infant leukemias, the frequency of KMT2A rearrangements is 70-80%. These pediatric leukemia sub-types portend a poorer prognosis and five-year survival rate that is lower than other leukemia sub-types and therefore represent significant unmet medical needs given the lack of curative therapeutic options. In April 2020, a competitor reported that its menin-KMT2A inhibitor showed potential anti-tumor activity in KMT2A-rearranged AML.



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We received orphan drug designation for KO-539 for the treatment of acute myeloid leukemia, or AML, from the FDA in July 2019. We initiated our Phase 1/2 clinical trial of KO-539 in relapsed or refractory AML in September 2019 and are actively recruiting at multiple sites in the United States and France with the anticipation of expanding to additional sites in the United States, France and other countries during the expansion phase of the study. Our menin-KMT2A Phase 1/2 clinical trial, which we call the Kura Oncology MEnin-KMT2A Trial, or KOMET-001, has an accelerated design and seeks to determine a recommended Phase 2 dose and schedule, or RP2D, using a modified toxicity probability interval, or MTPI, model.

On December 5, 2020, we announced preliminary results from our KOMET-001 Phase 1/2 clinical trial at an oral presentation at the 2020 American Society of Hematology, or ASH. As of the data cutoff date for the ASH presentation, November 2, 2020, the trial had enrolled 12 patients with relapsed or refractory AML, of whom ten were evaluable for safety and tolerability and eight were evaluable for efficacy. Clinical or biological activity was reported in six of the eight efficacy-evaluable patients, including two patients achieving a complete remission, one patient achieving a morphological leukemia-free state, and one patient experiencing a marked decrease in hydroxyurea requirements and having attained peripheral blood count stabilization. As presented at ASH, KO-539 has been well tolerated with a manageable safety profile to date. As of the data cutoff date, no drug discontinuations due to treatment-related adverse events and no evidence of QTc prolongation were reported. Treatment related adverse effects (grade ? 3) were reported to include pancreatitis, increased lipase, decreased neutrophil count, tumor lysis syndrome and deep venous thrombosis.

On May 6, 2021, we reported that KO-539 continues to demonstrate a wide therapeutic window and compelling single-agent activity in an all-comer population of the KOMET-001 trial and that we have amended the trial protocol to include two Phase 1b expansion cohorts at doses that have already cleared the safety threshold in dose escalation. Both cohorts will be enriched with NPM1-mutant and KMT2A-rearranged relapsed/refractory AML patients. We expect to enroll at least 12 patients in each of the Phase 1b expansion cohorts and assess those patients for safety and tolerability, pharmacokinetics and pharmacodynamics and efficacy in order to determine the recommended Phase 2 dose. In addition, the amended Phase 1b protocol gives us flexibility to enroll up to 18 additional patients per cohort, as appropriate. We believe the patients enrolled in the cohort selected as the recommended Phase 2 dose have the potential to be included in the subsequent, registration-directed portion of the KOMET-001 trial. Patient enrollment in the genetically enriched Phase 1b expansion cohorts is expected to begin at existing and new clinical sites in mid-2021.

Liquidity Overview

As of March 31, 2021, we had cash, cash equivalents and short-term investments of $603.9 million. We have an at-the-market issuance sales agreement with SVB Leerink LLC and Stifel, Nicolaus & Company, Incorporated, or ATM facility, under which we may offer and sell, from time to time, at our sole discretion, shares of our common stock having an aggregate offering price of up to $75.0 million. We have not yet sold any shares of our common stock under the ATM facility. To date, we have not generated any revenues from product sales, and we do not have any approved products. Since our inception, we have funded our operations primarily through equity and debt financings. We anticipate that we will require significant additional financing in the future to continue to fund our operations as discussed more fully below under the heading "Liquidity and Capital Resources."

Financial Operations Overview

Research and Development Expenses

We focus on the research and development of our product programs. Our research and development expenses consist of costs associated with our research and development activities including salaries, benefits, share-based compensation and other personnel costs, clinical trial costs, manufacturing costs for non-commercial products, fees paid to external service providers and consultants, facilities costs and supplies, equipment and materials used in clinical and preclinical studies and research and development. All such costs are charged to research and development expense as incurred. Payments that we make in connection with in-licensed technology for a particular research and development project that have no alternative future uses in other research and development projects or otherwise and therefore, no separate economic values, are expensed as research and development costs at the time such costs are incurred. As of March 31, 2021, we have no in-licensed technologies that have alternative future uses in research and development projects or otherwise.

We cannot determine with certainty the timing of initiation, the duration or the completion costs of current or future preclinical studies and clinical trials of our product candidates. At this time, due to the inherently unpredictable nature of preclinical and clinical development, we are unable to estimate with any certainty the costs we will incur and the timelines we will require in the continued development of our product candidates and our other pipeline programs. Clinical and preclinical



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development timelines, the probability of success and development costs can differ materially from expectations. Our future research and development expenses will depend on the preclinical and clinical success of each product candidate that we develop, as well as ongoing assessments of the commercial potential of such product candidates. In addition, we cannot forecast which product candidates may be subject to future collaborations, when such arrangements will be secured, if at all, and to what degree such arrangements would affect our development plans and capital requirements.

Completion of clinical trials may take several years or more, and the length of time generally varies according to the type, complexity, novelty and intended use of a product candidate. The cost of clinical trials may vary significantly over the life of a project as a result of differences arising during clinical development, including, among others:



    •   managing the impact of COVID-19 pandemic and related precautions on the
        operation of our clinical trials;


  • per patient clinical trial costs;


  • the number of clinical trials required for approval;


  • the number of sites included in the clinical trials;


  • the length of time required to enroll suitable patients;


  • the number of doses that patients receive;


  • the number of patients that participate in the clinical trials;


  • the drop-out or discontinuation rates of patients;


  • the duration of patient follow-up;


    •   potential additional safety monitoring or other studies requested by
        regulatory agencies;


    •   the number and complexity of analyses and tests performed during the
        clinical trial;


  • the phase of development of the product candidate; and


  • the efficacy and safety profile of the product candidate.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries, benefits, share-based compensation and other personnel costs for employees in executive, finance, business development and support functions. Other significant general and administrative expenses include the costs associated with obtaining and maintaining our patent portfolio, professional services for audit, legal, pre-commercial planning, investor and public relations, corporate activities and allocated facilities.

Other Income (Expense)

Other income (expense) consists primarily of management fee income, interest income and interest expense. Management fee income is earned in accordance with the management services agreement, as amended, with Araxes Pharma LLC. Interest expense mainly consists of interest on long-term debt.

Income Taxes

We have incurred net losses and have not recorded any U.S. federal or state income tax benefits for the losses as they have been offset by valuation allowances.



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Results of Operations

Comparison of the Three Months Ended March 31, 2021 and 2020



The following table sets forth our results of operations for the periods
presented, in thousands:


                                         Three Months Ended March 31,
                                           2021                 2020          Change

Research and development expenses $ 20,324 $ 12,575 $ 7,749 General and administrative expenses

           10,572                7,625       2,947
Other income, net                                202                  990        (788 )


Research and Development Expenses. The following table illustrates the
components of our research and development expenses for the periods presented,
in thousands:


                                             Three Months Ended March 31,
                                               2021                 2020          Change
Tipifarnib-related costs                  $       10,177       $        5,793     $ 4,384
KO-539-related costs                               2,661                  888       1,773
KO-947-related costs                                 108                  769        (661 )
Discovery stage programs                             770                  399         371
Personnel costs and other expenses                 5,237                3,556       1,681
Share-based compensation expense                   1,371                1,170         201

Total research and development expenses $ 20,324 $ 12,575 $ 7,749

The increase in tipifarnib-related research and development expenses for the three months ended March 31, 2021 compared to the same period in 2020 was primarily due to increases in companion diagnostics development activities, subject screening costs and other clinical costs related to our registration-directed trial of tipifarnib. The increase in KO-539-related research and development expenses for the three months ended March 31, 2021 compared to the same period in 2020 was primarily due to increases in costs related to our Phase 1/2 clinical trial of KO-539 which was initiated in September 2019 and manufacturing development activities. The decrease in KO-947-related costs for the three months ended March 31, 2021 compared to the same period in 2020 was due to the termination of the ERK inhibitor program in May 2020. The increase in discovery stage programs for the three months ended March 31, 2021 compared to the same period in 2020 was primarily due to increased research activities for new programs. The increase in personnel costs and other expenses for the three months ended March 31, 2021 compared to the same period in 2020 was to support our registration-directed clinical trial of tipifarnib and the Phase 1/2 clinical trial of KO-539. Personnel costs and other expenses include employee salaries and related expenses, facilities expense and overhead expenses. We expect our research and development expenses to increase in future periods as we continue clinical development activities for tipifarnib and KO-539.

General and Administrative Expenses. The increase in general and administrative expenses for the three months ended March 31, 2021 compared to the same period in 2020 was primarily due to increases of $1.7 million in non-cash share-based compensation expense and $1.6 million in personnel costs, offset by a decrease of $0.4 million in pre-commercial planning expenses. We expect our general and administrative expenses to increase in future periods to support our planned increase in research and development activities.

Other income, net. The decrease in other income, net, for the three months ended March 31, 2021 compared to the same period in 2020 was primarily due to a decrease in interest income.

Liquidity and Capital Resources

Since our inception, we have funded our operations primarily through equity and debt financings. We have devoted our resources to funding research and development programs, including discovery research, preclinical and clinical development activities.



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In March 2019, we entered into the ATM facility under which we may offer and sell, from time to time, at our sole discretion, shares of our common stock having an aggregate offering price of up to $75.0 million. We have not yet sold any shares of our common stock under the ATM facility.

In November 2018, we entered into a loan and security agreement with Silicon Valley Bank, or the SVB Loan Agreement, providing for up to $20.0 million in a series of term loans. Upon entering into the SVB Loan Agreement, we borrowed $7.5 million, or the Term Loan, the proceeds of which, in part, were used to pay off the outstanding balance of the debt under the loan and security agreement with Oxford Finance LLC and Silicon Valley Bank dated April 27, 2016, as amended in May 2017 and October 2017, or the SVB-Oxford Term Loan. Net proceeds from the Term Loan, after payoff of the SVB-Oxford Term Loan, were approximately $0.6 million. The Term Loan is due on the scheduled maturity date of May 1, 2023, or Maturity Date. Repayment of the Term Loan was interest only through November 30, 2020, followed by 30 equal monthly payments of principal plus accrued interest which commenced on December 1, 2020. The per annum interest rate for the Term Loan is the greater of (i) 5.50% and (ii) the sum of (a) the prime rate reported in The Wall Street Journal plus (b) 0.25%. In addition, a final payment of 7.75% of the amount of the Term Loan drawn will be due on the earlier of the Maturity Date, acceleration or prepayment of the Term Loan. If we elect to prepay the Term Loan, a prepayment fee equal to 1% of the then outstanding principal balance also will be due.

Our obligations under the SVB Loan Agreement are secured by substantially all of our assets other than our intellectual property, but including proceeds from the sale, licensing or other disposition of our intellectual property. Our intellectual property is subject to negative covenants, which, among other things, prohibit us from selling, transferring, assigning, mortgaging, pledging, leasing, granting a security interest in or otherwise encumbering our intellectual property, subject to limited exceptions.

We have incurred operating losses and negative cash flows from operating activities since inception. As of March 31, 2021, we had an accumulated deficit of $333.2 million. We expect our expenses to increase in connection with our ongoing activities, particularly as we continue the research and development of, continue and initiate clinical trials of, and seek marketing approval for, our product candidates. In addition, if we obtain marketing approval for any of our product candidates, we expect to incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution to the extent that such sales, marketing and distribution are not the responsibility of potential collaborators. Furthermore, we expect to continue to incur additional costs associated with operating as a public company. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations. If we are unable to raise capital when needed or on attractive terms, we would be forced to delay, reduce or eliminate our research and development programs or future commercialization efforts.

As of March 31, 2021, we had cash, cash equivalents and short-term investments of $603.9 million. Based on our current plans, we believe that our existing cash, cash equivalents and short-term investments will be sufficient to enable us to fund our operating expenses and capital expenditure requirements into 2024. Our future capital requirements will depend on many factors, including:



    •   the scope, progress, results and costs of drug discovery, preclinical
        development, laboratory testing and clinical trials for our product
        candidates;


  • the costs, timing and outcome of regulatory review of our product candidates;


    •   the costs of establishing or contracting for sales, marketing and
        distribution capabilities if we obtain regulatory approvals to market our
        product candidates;


    •   the costs of securing and producing drug substance and drug product
        material for use in preclinical studies, clinical trials and for use as
        commercial supply;


    •   the costs of securing manufacturing arrangements for development
        activities and commercial production;


    •   the scope, prioritization and number of our research and development
        programs;


    •   the extent to which we are obligated to reimburse, or entitled to
        reimbursement of, clinical trial costs under future collaboration
        agreements, if any;


    •   the extent to which we acquire or in-license other product candidates and
        technologies;


    •   the success of our current or future companion diagnostic test
        collaborations for companion diagnostic tests; and


    •   the costs of preparing, filing and prosecuting patent applications,
        maintaining and enforcing our intellectual property rights and defending
        intellectual property-related claims.


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To date, we have not generated any revenues from product sales, and we do not have any approved products. We do not know when, or if, we will generate any revenues from product sales. We do not expect to generate significant revenues from product sales unless and until we obtain regulatory approval of and commercialize one of our current or future product candidates. We are subject to all of the risks incident in the development of new therapeutic products, and we may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. We anticipate that we will need substantial additional funding in connection with our continuing operations.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of stock offerings, debt financings, collaborations, strategic partnerships or licensing arrangements. We do not have any committed external source of funds. Additional capital may not be available on reasonable terms, if at all. Subject to limited exceptions, our term loan facility also prohibits us from incurring indebtedness without the prior written consent of the Lender. To the extent that we raise additional capital through the sale of stock or convertible debt securities, the ownership interest of our stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Debt financing, if available, may involve agreements that include increased fixed payment obligations and covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures, declaring dividends, selling or licensing intellectual property rights and other operating restrictions that could adversely impact our ability to conduct our business. If we raise additional funds through collaborations, strategic partnerships or licensing arrangements with third parties, we may have to relinquish valuable rights to our product candidates, including our other technologies, future revenue streams or research programs, or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds when needed, we may be unable to carry out our business plan. As a result, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and commercialize our product candidates even if we would otherwise prefer to develop and commercialize such product candidates ourselves, and our business, financial condition and results of operations would be materially adversely affected.

The following table provides a summary of our net cash flow activities for the periods presented, in thousands:






                                              Three Months Ended March 31,
                                               2021                  2020             Change

Net cash used in operating activities $ (28,517 ) $ (19,822 ) $ (8,695 ) Net cash (used in) provided by investing activities

                                       (186,220 )             27,461         (213,681 )
Net cash provided by financing activities              79                  247             (168 )


Operating Activities. The increase in net cash used in operating activities for the three months ended March 31, 2021 compared to the same period in 2020 was primarily due to the increase of $11.5 million in net loss and $1.4 million in changes in prepaid expenses and other current assets, partially offset by increases of $1.9 million in non-cash share-based compensation expense, $1.0 million in amortization of premiums and accretion of discounts on marketable securities, net and $0.9 million in changes in accounts payable and accrued expenses.

Investing Activities. The increase in net cash used in investing activities for the three months ended March 31, 2021 compared to the same period in 2020 was primarily due to an increase of $211.9 million in purchases of marketable securities and a decrease of $2.3 million in maturities of marketable securities, offset by a decrease of $0.5 million in purchases of property and equipment.

Financing Activities. The decrease in net cash provided by financing activities for the three months ended March 31, 2021 compared to the same period in 2020 was primarily due to an increase of $0.8 million in the repayment of long-term debt, offset by an increase of $0.6 million in proceeds from exercises of stock options.

Contractual Obligations

There were no material changes in contractual obligations from the amounts disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

Off-Balance Sheet Arrangements

As of March 31, 2021, we did not have any off-balance sheet arrangements as defined in the rules and regulations of the SEC.



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Critical Accounting Policies and Management Estimates

The SEC defines critical accounting policies as those that are, in management's view, important to the portrayal of our financial condition and results of operations and demanding of management's judgment. Management's discussion and analysis of our financial condition and results of operations are based on our unaudited condensed financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles. The preparation of these unaudited condensed financial statements required estimates and judgments that affect the reported amounts of assets, liabilities, and expenses and the disclosure of contingent assets and liabilities in the unaudited condensed financial statements. On an ongoing basis, we evaluate our estimates and judgments, including those related to accrued expenses and share-based compensation. We base our estimates on historical experience, known trends and events, and various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Though the impact of the COVID-19 pandemic to our business and operating results presents additional uncertainty, we continue to use the best information available to inform our critical accounting estimates.

There have been no material changes to our critical accounting policies and estimates from the information provided in Part II, Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations - Critical Accounting Policies and Management Estimates," included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

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