You should read the following discussion and analysis of our financial condition and results of operations together with the consolidated financial statements and related notes included elsewhere in this Annual Report. This discussion contains forward-looking statements based upon current expectations that involve risks and uncertainties. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of various factors, including those discussed in "Item 1A. Risk Factors" and in other parts of
this Annual Report. Overview
Our most advanced clinical asset, rusfertide (generic name for PTG-300) is an injectable hepcidin mimetic in development for the potential treatment of erythrocytosis, iron overload and other blood disorders. Hepcidin is a key hormone in regulating iron equilibrium and is critical to the proper development of red blood cells. Rusfertide mimics the effect of the natural hormone hepcidin, but with greater potency, solubility and stability. We initiated Phase 2 proof of concept ("POC") studies in the blood disorders polycythemia vera ("PV") in the third quarter of 2019 and hereditary hemochromatosis ("HH") inJanuary 2020 . InDecember 2020 , we presented four posters and one oral presentation relating to rusfertide at theAmerican Society for Hematology's virtual annual meeting, including updated interim Phase 2 results for rusfertide in PV. We believe these interim results provide evidence regarding the potential of rusfertide to eliminate the need for phlebotomy by controlling hematocrit levels below 45% on an individual patient basis. Rusfertide has a unique mechanism of action in the potential treatment of PV, which may enable it to decrease and maintain hematocrit levels within the range of recommended clinical guidelines without causing the iron deficiency that may occur with frequent phlebotomy. We selected PV as our first indication for potential pivotal study in rusfertide and expect to complete patient enrollment in the ongoing Phase 2 clinical trial by mid-2021. We are consulting with regulatory authorities in the first half of 2021 to discuss the registrational clinical development plan. InJune 2020 , theU.S. Food and Drug Administration ("FDA") granted orphan drug designation for rusfertide for the treatment of PV. InOctober 2020 , theEuropean Medicines Agency granted orphan drug designation for rusfertide for the treatment of PV. InDecember 2020 , the FDA granted Fast Track designation for rusfertide for the treatment of PV. In addition, we expect to disclose preliminary data from our Phase 2 POC study in HH, our second indication, in the second half of 2021. We discontinued development of rusfertide for anemia associated with beta-thalassemia and myelodysplastic syndromes during the first half of 2020. Our clinical assets PTG-943 and PTG-200 are orally delivered investigational drugs currently in development for inflammatory bowel disease ("IBD"), a gastrointestinal ("GI") disease consisting primarily of ulcerative colitis ("UC") and Crohn's disease ("CD"), that are designed to block biological pathways currently targeted by marketed injectable antibody drugs. Our orally stable peptide approach may offer targeted delivery to the GI tissue compartment. We believe that, compared to antibody drugs, these product candidates have the potential to provide improved safety due to minimal exposure in the blood, increased convenience and compliance due to oral delivery, and the opportunity for the earlier introduction of targeted oral therapy. As a result, if successfully developed and approved, we believe they may transform the existing treatment paradigm for IBD. PN-943 is an investigational, orally delivered, gut-restricted alpha-4-beta-7 ("?4?7") specific integrin antagonist. We developed PN-943 as a potentially more potent orally delivered, gut-restricted ?4?7 backup compound to PTG-100, our first-generation orally delivered gut-restricted ?4?7 inhibitor that was being developed for treatment of IBD. In 2019, we completed a Phase 1 single ascending dose ("SAD") and multiple ascending dose ("MAD") clinical study of PN-943 in healthy volunteers to evaluate safety, pharmacokinetics and pharmacodynamics. The pharmacodynamic results indicated that the administration of PN-943 was well tolerated and showed results of target engagement that were 55
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suggestive of higher potency for PN-943 as compared to PTG-100. We submitted aU.S. Investigational New Drug application ("IND") with the FDA for PN-943 inDecember 2019 , which took effect inJanuary 2020 , and we initiated a Phase 2 POC study in UC in the second quarter of 2020 which is expected to be completed in 2022, subject to delays related to the COVID-19 pandemic. PTG-200 (also referenced as JNJ-67864238) is an investigational, orally delivered, gut-restricted Interleukin-23 receptor ("IL-23R") antagonist for the treatment of IBD. InMay 2017 , we entered into a worldwide license and collaboration agreement withJanssen Biotech, Inc. ("Janssen"), a Johnson & Johnson company, to co-develop and co-detail PTG-200 and certain related compounds for all indications, including IBD. The agreement with Janssen was amended inMay 2019 to expand the collaboration by supporting efforts towards second-generation IL- 23R antagonists, triggering a$25.0 million milestone payment to us. InJanuary 2020 , as part of the expanded research collaboration, we announced the identification and nomination of an orally delivered IL-23R antagonist peptide as a second-generation development candidate, triggering a$5.0 million milestone payment to us. Janssen initiated a global Phase 2 POC clinical study for PTG-200 in moderate-to-severe CD in the fourth quarter of 2019. Due to the uncertain effect on the timing of clinical trials caused by the COVID-19 pandemic, we have suspended guidance on a timeline for completion of the PTG-200 Phase 2 study. InOctober 2020 , we announced the selection of two second-generation IL-R antagonists for advancement into clinical development, PN-235 (also referenced as JNJ-77242113) and PN-232 (also referenced as JNJ-75105186). A Phase 1 study was initiated for PN-235 inDecember 2020 and is expected to be completed in 2021. PN-232 is in the late preclinical stage and we expect to initiate and complete a Phase 1 study for PN-232 in 2021. The advancement of three different oral co-development candidates provides us with several strategic options for development in multiple indications. We are also continuing our joint research efforts to identify additional IL-23R antagonists. Our clinical assets are all derived from our proprietary discovery platform. Our platform enables us to engineer novel, structurally constrained peptides that are designed to retain key advantages of both orally delivered small molecules and injectable antibody drugs in an effort to overcome many of their limitations as therapeutic agents. Importantly, constrained peptides can be designed to potentially alleviate the fundamental instability inherent in traditional peptides to allow different delivery forms, such as oral, subcutaneous, intravenous, and rectal. We continue to use our peptide technology platform to discover product candidates against targets in disease areas with significant unmet medical needs. COVID-19 Business Impact We are subject to risks and uncertainties as a result of the COVID-19 pandemic. We are continuing to closely monitor the impact of the COVID-19 pandemic on our business and have taken and continue to take proactive efforts to protect the health and safety of our patients, study investigators, clinical research staff and employees, and to maintain business continuity. The extent of the impact of the COVID-19 pandemic on our activities is highly uncertain and difficult to predict, as the pandemic and the response to the pandemic continue to evolve. Capital markets and economies worldwide have been significantly impacted by the COVID-19 pandemic, and the pandemic has contributed to a global economic recession. Such economic disruption could have a material adverse effect on our business. Policymakers around the globe have responded with fiscal policy actions to support the healthcare industry and economy as a whole. The magnitude and overall effectiveness of these actions remains uncertain. The severity of the impact of the COVID-19 pandemic on our activities will depend on a number of factors, including, but not limited to, the duration and severity of the pandemic, including the severity of any additional periods of increases or spikes in the number of cases in the areas we, our suppliers and our manufacturers operate and areas where our clinical trial sites are located. Accordingly, the extent and severity of the impact on our existing and planned clinical trials, manufacturing, collaboration activities and operations is uncertain and cannot be fully predicted. We have experienced delays in our existing and planned clinical trials due to the worldwide impacts of the pandemic. Our future results of operations and liquidity could be adversely impacted by further delays in existing and planned clinical trials and collaboration activities, continued difficulty in recruiting patients for these clinical trials, delays in manufacturing and collaboration activities, supply chain disruptions, the ongoing impact on operating activities and employees, and the ongoing impact of any initiatives or programs that we may undertake to address financial and operational challenges. As 56
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of the date of issuance of this Annual Report on Form 10-K, the extent to which the COVID-19 pandemic may materially impact our future financial condition, liquidity or results of operations is uncertain.
Operations
We have incurred net losses in each year since inception and we do not anticipate achieving sustained profitability in the foreseeable future. Our net losses were$66.2 million ,$77.2 million and$38.9 million for the years endedDecember 31, 2020 , 2019 and 2018, respectively. As ofDecember 31, 2020 , we had an accumulated deficit of$283.8 million . Substantially all of our net losses have resulted from costs incurred in connection with our research and development programs and from general and administrative costs associated with our operations. We expect to continue to incur significant research, development and other expenses related to our ongoing operations, product development, including clinical development activities under our worldwide license and collaboration agreement with Janssen, and pre-commercialization activities. As a result, we expect to continue to incur losses in the future as we continue our development of, and seek regulatory approval for, our product candidates.
Janssen License and Collaboration Agreement
OnMay 26, 2017 , we and Janssen, one of the Janssen Pharmaceutical Companies of Johnson & Johnson, entered into an exclusive license and collaboration agreement for the clinical development, manufacture and potential commercialization of PTG-200 worldwide for the treatment of CD and UC (the "Janssen License and Collaboration Agreement"), which was subsequently amended effectiveMay 7, 2019 (the "First Amendment"). The First Amendment expanded the scope of the Janssen License and Collaboration Agreement by supporting efforts towards identifying and development second-generation compounds. Janssen is a related party to us asJohnson & Johnson Innovation - JJDC, Inc. , a significant stockholder of ours, and Janssen are both subsidiaries of Johnson & Johnson. During the third quarter of 2017, we received a non-refundable, upfront cash payment of$50.0 million from Janssen. During the second quarter of 2019, we received a non-refundable cash payment of$25.0 million upon execution of the First Amendment. During the first quarter of 2020, we received a cash payment of$5.0 million upon the successful nomination of a second-generation development candidate. See Note 3 to the Consolidated Financial Statements included elsewhere in this Annual Report on Form 10-K for additional information.
Critical Accounting Polices and Estimates
Our management's discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, which have been prepared in accordance withUnited States generally accepted accounting principles. The preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, as well as the reported revenue generated and expenses incurred during the reporting periods. Our estimates are based on our historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. We believe that the accounting policies discussed below are critical to understanding our historical and future performance, as these policies relate to the more significant areas involving management's judgments and estimates.
Use of Estimates
Due to the COVID-19 pandemic, there has been uncertainty and disruption in the global economy and financial markets. We have taken into consideration any known COVD-19 impacts in our accounting estimates to date and are not aware of any additional specific events or circumstances that would require any additional updates to our estimates or judgments or a revision of the carrying value of our assets or liabilities as of the date of issuance of this Annual Report on Form 10-K. These estimates may change as new events occur and additional information is obtained. Actual results could differ materially from these estimates under different assumptions or conditions. 57 Table of Contents Leases
We adopted Accounting Standards Codification Topic 842, Leases, ("ASC 842") effectiveJanuary 1, 2019 . We determine if an arrangement is a lease at inception. Pursuant to ASC 842, operating leases are included in operating lease right-of-use ("ROU") assets, operating lease liabilities, and noncurrent operating lease liabilities on the consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. If our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives and initial direct costs incurred. Lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. We record tenant improvement allowances as a reduction to the ROU asset with the impact of the decrease recognized prospectively over the remaining lease term. The leasehold improvements will be amortized over the shorter of their useful life or the remaining term of the lease.
Revenue Recognition
We follow Accounting Standards Codification Topic 606, Revenue from Contracts with Customers ("ASC 606"). Under ASC 606, we recognize revenue when our customer obtains control of promised goods or services, in an amount that reflects the consideration which we expect to receive in exchange for those goods or services. To determine revenue recognition for arrangements that we determine are within the scope of ASC 606, we perform the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) we satisfy a performance obligation. We apply the five-step model to contracts when it is probable that we will collect the consideration we are entitled to in exchange for the goods or services we transfer to the customer. At contract inception, we assess the goods or services promised within each contract, determine those that are performance obligations, and assess whether each promised good or service is distinct. We then recognize as revenue the amount of the transaction price that is allocated to the respective performance obligations when (or as) the performance obligations are satisfied. We constrain our estimate of the transaction price up to the amount (the "variable consideration constraint") that a significant reversal of recognized revenue is not probable. Licenses of intellectual property: If a license to our intellectual property is determined to be distinct from the other performance obligations identified in an arrangement, we recognize revenue from non-refundable, upfront fees allocated to the license when the license is transferred to the customer and the customer is able to use and benefit from the license. For licenses that are bundled with other promises, we utilize judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring proportional performance for purposes of recognizing revenue from non-refundable, upfront fees. We evaluate the measure of proportional performance each reporting period and, if necessary, adjust the measure of performance and related revenue recognition. Milestone payments: At the inception of each arrangement or amendment that includes development, regulatory or commercial milestone payments, we evaluate whether the milestones are considered probable of being reached and estimate the amount to be included in the transaction price. ASC 606 suggests two alternatives to use when estimating the amount of variable consideration: the expected value method and the most likely amount method. Under the expected value method, an entity considers the sum of probability-weighted amounts in a range of possible consideration amounts. Under the most likely amount method, an entity considers the single most likely amount in a range of possible consideration amounts. Whichever method is used, it should be consistently applied throughout the life of the contract; however, it is not necessary for us to use the same approach for all contracts. We expect to use the most likely amount method for development and regulatory milestone payments. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within our control or the control of the licensee, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. If there is more than one performance obligation, the transaction price is then allocated to 58 Table of Contents
each performance obligation on a relative stand-alone selling price basis. We recognize revenue as or when the performance obligations under the contract are satisfied. At the end of each subsequent reporting period, we re-evaluate the probability or achievement of each such milestone and any related constraint, and if necessary, adjust our estimates of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis, which would affect revenues and earnings in the period of adjustment. Royalties: For arrangements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, we recognize revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied). Upfront payments and fees are recorded as deferred revenue upon receipt or when due and may require deferral of revenue recognition to a future period until we perform our obligations under these arrangements. Amounts payable to us are recorded as accounts receivable when our right to consideration is unconditional. Amounts payable to us and not yet billed to the collaboration partner are recorded as contract assets. We do not assess whether a contract has a significant financing component if the expectation at contract inception is such that the period between payment by the customer and the transfer of the promised goods or services to the customer will be one year or less. Contractual cost sharing payments made to a customer or collaboration partner are accounted for as a reduction to the transaction price if such payments are not related to distinct goods or services received from the customer or collaboration partner. Contracts may be amended to account for changes in contract specifications and requirements. Contract modifications exist when the amendment either creates new, or changes existing, enforceable rights and obligations. When contract modifications create new performance obligations and the increase in consideration approximates the standalone selling price for goods and services related to such new performance obligations as adjusted for specific facts and circumstances of the contract, the modification is considered to be a separate contract and revenue is recognized prospectively. If a contract modification is not accounted for as a separate contract, we account for the promised goods or services not yet transferred at the date of the contract modification (the remaining promised goods or services) prospectively, as if it were a termination of the existing contract and the creation of a new contract, if the remaining goods or services are distinct from the goods or services transferred on or before the date of the contract modification. We account for a contract modification as if it were a part of the existing contract if the remaining goods or services are not distinct and, therefore, form part of a single performance obligation that is partially satisfied at the date of the contract modification. In such case the effect that the contract modification has on the transaction price, and on the entity's measure of progress toward complete satisfaction of the performance obligation, is recognized as an adjustment to revenue (either as an increase in or a reduction of revenue) at the date of the contract modification (the adjustment to revenue is made on a cumulative catch-up basis). The period between when we transfer control of promised goods or services and when we receive payment is expected to be one year or less, which is consistent with our historical experience. Upfront payment contract liabilities resulting from our license and collaboration agreements do not represent a financing component as the payment is not financing the transfer of goods and services, and the technology underlying the licenses granted reflects research and development expenses already incurred by us. As such, we do not adjust our revenues for the effects of a significant financing component.
Research and Development Costs
Research and development costs are expensed as incurred, unless there is an alternate future use in other research and development projects or otherwise. Research and development costs include salaries and benefits, stock-based compensation expense, laboratory supplies and facility-related overhead, outside contracted services including clinical trial costs, manufacturing and process development costs for both clinical and pre-clinical materials, research costs, development milestone payments under license and collaboration agreements,
and other consulting services. 59 Table of Contents We accrue for estimated costs of research and development activities conducted by third-party service providers, which include the conduct of pre-clinical studies and clinical trials, and contract manufacturing activities. We record the estimated costs of research and development activities based upon the estimated services provided but not yet invoiced and includes these costs in accrued expenses and other payables in the consolidated balance sheets and within research and development expense in the consolidated statements of operations. We accrue for these costs based on factors such as estimates of the work completed and in accordance with agreements established with its third-party service providers. As actual costs become known, we adjust our accrued liabilities. We have not experienced any material differences between accrued liabilities and actual costs incurred. However, the status and timing of actual services performed, number of patients enrolled, the rate of patient enrollment and number and location of sites activated may vary from our estimates, resulting in adjustments to expense in future periods. Changes in these estimates that result in material changes to our accruals could materially affect our results of operations.
We have received orphan drug designation from the
Stock-Based Compensation
We recognize compensation costs related to stock options accounted for under Accounting Standards Codification Topic 718 - "Stock Compensation" based on the estimated fair value of the awards on the date of grant. We estimate the fair value, and the resulting stock-based compensation expense, using the Black-Scholes option-pricing model. The estimated fair value of the stock-based awards is generally recognized on a straight-line basis over the requisite service period, which is generally the vesting period of the respective awards. The Black-Scholes option-pricing model requires the use of subjective assumptions which determine the fair value of stock-based awards. Expected volatility generally requires significant judgement to determine. Prior toJanuary 1, 2020 , our expected volatility was estimated based on the average volatility for comparable publicly traded biopharmaceutical companies over a period equal to the expected term of the stock option grants. BeginningJanuary 1, 2020 , our expected volatility was estimated based upon a mix of 75% of the average volatility for comparable publicly traded biopharmaceutical companies over a period equal to the expected term of the stock option grants and 25% of the volatility of our own stock price since our initial public offering inAugust 2016 . These comparable companies are chosen based on their similar size, stage in the life cycle, or area of specialty. We will continue to apply this process until a longer period of historical information regarding the volatility of our own stock price becomes available.
Income Taxes
We use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and the tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. We assess the likelihood that the resulting deferred tax assets will be realized. A valuation allowance is provided when it is more likely than not that all or some portion of a deferred tax asset will not be realized. AtDecember 31, 2020 , our total gross deferred tax assets were$72.9 million and our gross deferred tax liabilities were$1.0 million . Due to our lack of earnings history and uncertainties surrounding our ability to generate future taxable income, our net deferred tax assets have been offset by a valuation allowance of$71.9 million . The deferred tax assets were primarily comprised of federal and state tax net operating loss and tax credit carryforwards. AtDecember 31, 2020 , we had$222.8 million of federal net operating loss carryforwards and$214.3 million of state net operating loss carryforwards.$78.7 million of the federal net operating loss carryforwards will begin to expire in 2033, if not utilized, and the remaining$144.1 million have no expiration date. The state net operating loss carryforwards will begin to expire in 2035, if not utilized. As ofDecember 31, 2020 , we also had accumulated Australian tax losses of AUD 3.7 million ($2.8 million ) available for carry forward against future earnings, which under relevant tax laws do not expire but may not be available under certain circumstances. 60
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Utilization of the net operating loss carryforwards may be subject to a substantial annual limitation due to ownership changes that may have occurred or that could occur in the future, as required by Section 382 of the Internal Revenue Code (the "Code"), and similar state provisions. These ownership change limitations may limit the amount of net operating loss carryforwards and other tax attributes that can be utilized annually to offset future taxable income and tax, respectively. In general, an "ownership change" as defined by Section 382 of the Code results from a transaction or series of transactions over a three-year period resulting in an ownership change of more than 50 percentage points (by value) of the outstanding stock of a company by certain stockholders.
Recent Accounting Pronouncements
Information regarding recent accounting pronouncements applicable to us is included in Note 2 to the Consolidated Financial Statements included elsewhere in this Annual Report on Form 10-K.
Components of Our Results of Operations
License and Collaboration Revenue
Our license and collaboration revenue is derived from payments we receive under the Janssen License and Collaboration Agreement. See Note 3 to the Consolidated Financial Statements included elsewhere in this Annual Report on Form 10-K for additional information.
Research and Development Expenses
Research and development expenses represent costs incurred to conduct research, such as the discovery and development of our product candidates. We recognize all research and development costs as they are incurred, unless there is an alternative future use in other research and development projects or otherwise. Non-refundable advance payments for goods and services that will be used in future research and development activities are expensed when the activity has been performed or when the goods have been received rather than when payment has been made. In instances where we enter into agreements with third parties to provide research and development services to us, costs are expensed as services are performed. Amounts due under such arrangements may be either fixed fee or fee for service and may include upfront payments, monthly payments, and payments upon the completion of milestones or the receipt of deliverables.
Research and development expenses consist primarily of the following:
? expenses incurred under agreements with clinical study sites that conduct
research and development activities on our behalf;
? employee-related expenses, which include salaries, benefits and stock-based
compensation;
? laboratory vendor expenses related to the preparation and conduct of
pre-clinical, non-clinical, and clinical studies;
? costs related to production of clinical supplies and non-clinical materials,
including fees paid to contract manufacturers;
? license fees and milestone payments under license and collaboration agreements;
and
facilities and other allocated expenses, which include expenses for rent and
? maintenance of facilities, information technology, depreciation and
amortization expense and other supplies.
We recognize the funds from grants under government programs as a reduction of research and development expenses when the related research costs are incurred. In addition, we recognize the funds related to our Australian 61
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research and development refundable cash tax incentive that are not subject to refund provisions as a reduction of research and development expenses. The research and development tax incentives are recognized when there is reasonable assurance that the incentives will be received, the relevant expenditure has been incurred and the amount of the consideration can be reliably measured. We evaluate our eligibility under the tax incentive program as of each balance sheet date and make accruals and related adjustments based on the most current and relevant data available. We may alternatively be eligible for a taxable credit in the form of a non-cash tax incentive. We allocate direct costs and indirect costs incurred to product candidates when they enter clinical development. For product candidates in clinical development, direct costs consist primarily of clinical, pre-clinical, and drug discovery costs, costs of supplying drug substance and drug product for use in clinical and pre-clinical studies, including clinical manufacturing costs, contract research organization fees, and other contracted services pertaining to specific clinical and pre-clinical studies. Indirect costs allocated to our product candidates on a program specific basis include research and development employee salaries, benefits, and stock-based compensation, and indirect overhead and other administrative support costs. Program-specific costs are unallocated when the clinical expenses are incurred for our early stage research and drug discovery projects, our internal resources, employees and infrastructure are not tied to any one research or drug discovery project and are typically deployed across multiple projects. As such, we do not provide financial information regarding the costs incurred for early stage pre-clinical and drug discovery programs on a program-specific basis prior to the clinical development stage.
The following table summarizes our research and development expenses incurred during the periods indicated:
Year Ended December 31, 2020 2019 2018 (Dollars in thousands) Clinical and development expense - rusfertide (PTG-300)$ 32,395 $ 30,325 $ 14,304 Clinical and development expense - PN-943 23,354 20,924 523 Clinical and development expense - PTG-200 925 9,414 16,120 Clinical and development expense - PN-235 317 - - Clinical and development expense - PTG-100 540 288 20,443 Milestone payment obligation to former collaboration partner - - 500 Pre-clinical and drug discovery research expense 18,453 4,162 9,837 Grants and tax incentives expense reimbursement, net (1,478) (110) (2,230) Total research and development expenses$ 74,506 $ 65,003 $ 59,497 We expect our research and development expenses will increase as we progress our product candidates into later stage clinical trials, expand the number of ongoing clinical trials, advance development activities under the Janssen License and Collaboration Agreement, advance our discovery research projects into the pre-clinical stage and continue our early-stage research. The process of conducting research, identifying potential product candidates and conducting pre-clinical and clinical trials necessary to obtain regulatory approval is costly and time intensive. We may never succeed in achieving marketing approval for our product candidates regardless of our costs and efforts. The probability of success of our product candidates may be affected by numerous factors, including pre-clinical data, clinical data, competition, manufacturing capability, our ability to receive, and the timing of, regulatory approvals, market conditions, and our ability to successfully commercialize our products if they are approved for marketing. As a result, we are unable to determine the duration and completion costs of our research and development projects or when and to what extent we will generate revenue from the commercialization and sale of any of our product candidates. Our research and development programs are subject to change from time to time as we evaluate our priorities and available resources.
General and Administrative Expenses
General and administrative expenses consist of personnel costs, allocated facilities costs and other expenses for outside professional services, including legal, human resources, audit and accounting services, and pre-commercial selling and marketing costs. Personnel costs consist of salaries, benefits and stock-based compensation. Allocated expenses consist of expenses for rent and maintenance of facilities, information technology, depreciation and amortization expense and other supplies. We expect to continue to incur expenses to support our continued operations as 62 Table of Contents
a public company, including expenses related to existing and future compliance
with rules and regulations of the
Interest Income
Interest income consists of interest earned on our cash, cash equivalents, and marketable securities, which is comprised of contractual interest, premium amortization and discount accretion.
Interest Expense
Interest expense consists of interest recognized on our long-term debt, which is comprised of contractual interest, amortization of origination fees and other issuance costs, and accretion of final payment fees.
Loss on Early Repayment of Debt
Loss on early repayment of debt consists of prepayment and final payment fees paid upon the early repayment of our long-term debt.
Other Expense, Net
Other expense, net consists primarily of amounts related to foreign exchange gains and losses and related items.
Results of Operations
Comparison of the Year ended
Year Ended December 31, Dollar % 2020 2019 Change Change (Dollars in thousands)
License and collaboration revenue - related party
231$ 28,397 * Operating expenses: Research and development (1) 74,506 65,003 9,503 15 General and administrative (2) 18,638 15,749 2,889 18 Total operating expenses 93,144 80,752 12,392 15 Loss from operations (64,516) (80,521) 16,005 (20) Interest income 900 2,813 (1,913) (68) Interest expense (598) (169) (429) 254
Loss on early repayment of debt (585) - (585) 100 Other expense, net (46) (1) (45) * Loss before income tax (expense) benefit (64,845) (77,878) 13,033 (17) Income tax (expense) benefit (1,305)
691 (1,996) (289) Net loss$ (66,150) $ (77,187) $ 11,037 (14)
(1) Includes
(2) Includes
*Percentage not meaningful 63 Table of Contents
License and Collaboration Revenue
License and collaboration revenue increased$28.4 million from$0.2 million for the year endedDecember 31, 2019 to$28.6 million for the year endedDecember 31, 2020 . The increase in license and collaboration revenue was primarily due to an update in the amounts forecast for future services remaining to be performed under the Janssen License and Collaboration Agreement, correspondingly increasing our overall cumulative percentage of completion of our performance obligation during year endedDecember 31, 2020 , coupled with continued performance and delivery of services under the ongoing Janssen License and Collaboration Agreement. The increase in license and collaboration revenue for the year endedDecember 31, 2020 also included the impact of a one-time cumulative adjustment related to the application of revenue recognition principles following theMay 2019 amendment of the Janssen License and Collaboration Agreement that reduced 2019 revenue by$9.4 million . The contract modification resulted in an increase in the transaction price and additional deliverables under the initial performance obligation, leading to an overall corresponding decrease in the cumulative percentage of completion of our performance obligation for the Janssen License and Collaboration Agreement during the second quarter of 2019. We determined that the transaction price of the Janssen License and Collaboration Agreement was$98.6 million as ofDecember 31, 2020 , a decrease of$14.3 million from the transaction price of$112.9 million atDecember 31, 2019 . In order to determine the transaction price, we evaluated all payments expected to be received during the duration of the contract, net of development costs reimbursement expected to be payable to Janssen. We determined that the transaction price includes the$50.0 million upfront payment, the$25.0 million payment received upon the effectiveness of the First Amendment, the$5.0 million payment triggered by the successful nomination of a second-generation compound,$17.9 million of reimbursement from Janssen for services performed for PTG-200 Phase 2 and for second-generation compound research costs and other services, and estimated variable consideration consisting of a$7.5 million milestone payment subject to the completion of a Phase 1 study for a second-generation compound, offset by$6.8 million of net cost reimbursement to Janssen for services performed. The decrease in transaction price fromDecember 31, 2019 toDecember 31, 2020 was due primarily to a decrease in the forecast of remaining services to be provided under the initial performance obligation. We re-evaluate the transaction price each reporting period and as uncertain events are resolved or other changes in circumstances occur.
Research and Development Expenses
Year Ended December 31, Dollar % 2020 2019 Change Change (Dollars in thousands) Clinical and development expense - rusfertide (PTG-300)$ 32,395 $ 30,325 $ 2,070 7 Clinical and development expense - PN-943 23,354 20,924 2,430 12 Clinical and development expense - PTG-200 925 9,414 (8,489) (90) Clinical and development expense - PN-235 317 - 317 100 Clinical and development expense - PTG-100 540 288 252 88 Preclinical and drug discovery research expense 18,453 4,162 14,291 344 Grants and tax incentive expense reimbursement, net (1,478)
(110) (1,368) *
Total research and development expenses
*Percentage not meaningful Research and development expenses increased$9.5 million , or 15%, from$65.0 million for the year endedDecember 31, 2019 to$74.5 million for the year endedDecember 31, 2020 . The increase included a$14.3 million increase in pre-clinical and discovery research expenses, including pre-clinical costs related to our second-generation research collaboration efforts with Janssen, a$2.4 million increase in PN-943 clinical trial and development expenses following the initiation of the Phase 2 trial in UC in 2020, a$2.1 million increase in rusfertide clinical trial and development expenses, including the ongoing Phase 2 trials in PV and HH, and$0.3 million of Phase 1 clinical trial and development expenses for PN-235. These increases were partially offset by a decrease of$8.5 million for PTG-200 clinical trial and development expenses under the Janssen License and Collaboration Agreement due to timing of 64
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deliverables and related cost sharing arrangements, and the impact of a$1.3 million reversal of previously recorded reductions to research and development expenses in connection with the tax incentive fromAustralia in 2019. Research and development expenses for the year endedDecember 31, 2020 included increased personnel costs due to an increase in research and development headcount from 54 full-time equivalent employees atDecember 31, 2019 to 59 full-time equivalent employees atDecember 31, 2020 .
General and Administrative Expenses
General and administrative expenses increased$2.9 million , or 18%, from$15.7 million for the year endedDecember 31, 2019 to$18.6 million for the year endedDecember 31, 2020 primarily due to increases of$1.4 million in compensation-related expenses to support the growth of our operations,$1.3 million in legal expenses and$0.8 million in insurance expense, partially offset by a$0.6 decrease in other expenses, including accounting fees, market research, recruiting fees and travel expense.
Interest Income
Interest income decreased$1.9 million , or 68%, from$2.8 million for the year endedDecember 31, 2019 to$0.9 million for the year endedDecember 31, 2020 . This decrease was primarily due to the declining interest rate environment and a change in the mix of marketable securities compared to the prior year period, despite higher interest-earning asset balances.
Interest Expense
Interest expense increased$0.4 million , or 254%, from$0.2 million for the year endedDecember 31, 2019 to$0.6 million for the year endedDecember 31, 2020 . Interest expense reflects contractual interest, amortization of origination fees and other issuance costs, and accretion of final payment fees on our term loan that funded inOctober 2019 and was repaid in full inJune 2020 .
Income Tax Expense
Income tax expense increased by$2.0 million , or 289%, from an income tax benefit of$0.7 million for the year endedDecember 31, 2019 to income tax expense of$1.3 million for the year endedDecember 31, 2020 . Our effective income tax rate was (2.0)% for the year endedDecember 31, 2020 as compared to 0.9% for the year endedDecember 31, 2019 . Our effective income tax rate differs from our federal statutory rate of 21% primarily because our losses cannot be benefited due to our full valuation allowance position. During the second quarter of 2020, ourAustralia subsidiary sold beneficial rights to discovery intellectual property to ourU.S. entity, and theU.S. entity reimbursed theAustralia subsidiary for certain direct development costs. Upon completion of the sale, we analyzed tax planning strategies and future income and concluded that a valuation allowance is necessary for ourAustralia subsidiary. Income tax expense for year endedDecember 31, 2020 reflects this sale of intellectual property rights, cost reimbursements and related adjustments to the deferred tax asset, establishing a valuation allowance and certain uncertain tax position liabilities. Income tax benefit for the year endedDecember 31, 2019 included a discrete tax benefit of approximately$1.1 million for the 2017 Australia refundable R&D tax offset. 65 Table of Contents
Comparison of the Years ended
Year Ended December 31, Dollar % 2019 2018 Change Change (Dollars in thousands)
License and collaboration revenue - related party $ 231$ 30,925 $ (30,694) (99) Operating expenses: Research and development (1) 65,003 59,497 5,506 9 General and administrative (2) 15,749 13,697 2,052 15 Total operating expenses 80,752 73,194 7,558 10 Loss from operations (80,521) (42,269) (38,252) 90 Interest income 2,813 2,566 247 10 Interest expense (169) - (169) 100 Other expense, net (1) (20) 19 (95) Loss before income tax benefit (77,878) (39,723) (38,155) 96 Income tax benefit 691 799 (108) (14) Net loss$ (77,187) $ (38,924) $ (38,263) 98
(1) Includes
(2) Includes
License and Collaboration Revenue
License and collaboration revenue decreased$30.7 million , or 99%, from$30.9 million for the year endedDecember 31, 2018 to$0.2 million for the year endedDecember 31, 2019 . The decrease in license and collaboration revenue was primarily due to a contract modification for the First Amendment to the Janssen License and Collaboration Agreement and the related cumulative catchup adjustment during the second quarter of 2019. The contract modification resulted in an increase in the transaction price and additional deliverables under the performance obligation, leading to an overall corresponding decrease in the cumulative percentage of completion of our performance obligation for the Janssen License and Collaboration Agreement. We determined that the transaction price of the Janssen License and Collaboration Agreement was$112.9 million as ofDecember 31, 2019 , an increase of$52.2 million from the transaction price of$60.7 million atDecember 31, 2018 . In order to determine the transaction price, we evaluated all payments to be received during the duration of the contract, net of Phase 2 development costs reimbursement expected to be payable to Janssen. We determined that the transaction price includes the$50.0 million upfront payment, the$25.0 million payment received upon the effectiveness of the First Amendment, the$5.0 million payment triggered by the successful nomination of a second-generation compound,$18.3 million of reimbursement from Janssen for services performed for PTG-200 Phase 2 and for second-generation compound research costs and other services, and$14.6 million of estimated variable consideration, which includes a$7.5 million milestone payment subject to the completion of a Phase 1 study for a second-generation compound. The increase in transaction price fromDecember 31, 2018 toDecember 31, 2019 was due to an increase in fixed and variable consideration related to the contract modification for First Amendment to the Janssen License and Collaboration Agreement effectiveMay 7, 2019 . 66 Table of Contents
Research and Development Expenses
Year Ended December 31, Dollar % 2019 2018 Change Change (Dollars in thousands) Clinical and development expense - rusfertide (PTG-300)$ 30,325 $ 14,304 16,021 112 Clinical and development expense - PN-943 20,924 523 20,401 * Clinical and development expense - PTG-200 9,414 16,120 (6,706) (42) Clinical and development expense - PTG-100 288 20,443 (20,155) (99) Milestone payment obligation to former collaboration partner - 500 (500) (100) Preclinical and drug discovery research 9,837 (5,675) (58) expense 4,162 Grants and tax incentive expense reimbursement, net (110)
(2,230) 2,120 (95)
Total research and development expenses
*Percentage not meaningful Research and development expenses increased$5.5 million , or 9%, from$59.5 million for the year endedDecember 31, 2018 to$65.0 million for the year endedDecember 31, 2019 . The increase included$20.4 million of PN-943 clinical trial and development expenses, an increase of$16.0 million in rusfertide clinical trial and development expenses and a$1.3 million reversal of previously recorded reductions to research and development expenses in connection with the tax incentive fromAustralia , partially offset by a decrease of$20.1 million in PTG-100 clinical trial and development expenses due to the halting of further development during 2018 and related credit adjustments, a decrease of$6.7 million for PTG-200 clinical trial and development expenses under the Janssen License and Collaboration Agreement due to timing of deliverables and a decrease of$5.7 million in pre-clinical and discovery research expenses. Research and development expenses for the year endedDecember 31, 2019 included increased personnel costs due to an increase in research and development headcount from 49 employees atDecember 31, 2018 to 54 employees atDecember 31, 2019 .
General and Administrative Expenses
General and administrative expenses increased$2.0 million , or 15%, from$13.7 million for the year endedDecember 31, 2018 to$15.7 million for the year endedDecember 31, 2019 primarily due to increases of$1.0 million in personnel costs to support the growth of our operations,$0.7 million in professional fees and$0.3 million in insurance expense. The increase in personnel costs for the year endedDecember 31, 2019 reflected an increase in general and administrative headcount from 15 employees atDecember 31, 2018 to 19 employees atDecember 31, 2019 . Interest Income Interest income increased$0.2 million , or 10%, from$2.6 million for the year endedDecember 31, 2018 to$2.8 million for the year endedDecember 31, 2019 primarily due to higher interest income related to an increase in marketable securities balances. Income Tax Benefit Income tax benefit decreased$0.1 million , or 14%, from$0.8 million for the year endedDecember 31, 2018 , representing an effective income tax rate of 2.0%, to$0.7 million for the year endedDecember 31, 2019 , representing an effective income tax rate of 0.9%. Our effective income tax rate differs from our federal statutory rate of 21%, primarily because ourU.S. loss cannot be benefited due to the full valuation allowance position and reduced by foreign taxes. 67
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Liquidity and Capital Resources
Liquidity and Capital Expenditures
As ofDecember 31, 2020 , we had$307.8 million of cash, cash equivalents and marketable securities and an accumulated deficit of$283.8 million . Our operations have been financed primarily by net proceeds from the sale of shares of our capital stock and payments under the Janssen License and Collaboration Agreement. During the third quarter of 2017 we received a non-refundable, upfront payment of$50.0 million from Janssen. During the second quarter of 2019, we received a nonrefundable$25.0 million payment from Janssen upon execution of the First Amendment. During the first quarter of 2020, we received a nonrefundable$5.0 million payment from Janssen. InSeptember 2017 , we filed a registration statement on Form S-3 with theSecurities and Exchange Commission (File No. 333-220314) that was declared effective as ofOctober 5, 2017 and permits the offering, issuance, and sale by us of up to a maximum aggregate offering price of$200.0 million of our common stock, preferred stock and certain debt securities (the "2017 Form S-3"). Up to a maximum of$50.0 million of the maximum aggregate offering price of$200.0 million could be issued and sold pursuant to an at-the-market ("ATM") financing facility under a sales agreement (the "2017 Sales Agreement"). The 2017 Sales Agreement was terminated in 2019. During the year endedDecember 31, 2019 , prior to the termination of the 2017 Sales Agreement, we sold 2,846,641 shares of our common stock for net proceeds of$34.5 million , after deducting issuance costs. We sold 151,273 shares of our common stock pursuant to the 2017 Sales Agreement during the year endedDecember 31, 2018 for net proceeds of$1.5 million , after deducting issuance costs. The 2017 Form S-3 expired inOctober 2020 . InAugust 2018 , we entered into a Securities Purchase Agreement with certain accredited investors (each, an "Investor" and, collectively, the "Investors"), pursuant to which we sold an aggregate of 2,750,000 shares of our common stock at a price of$8.00 per share, for aggregate net proceeds of$21.7 million , after deducting offering expenses payable by us. In a concurrent private placement, we issued the Investors warrants to purchase an aggregate of 2,750,000 shares of our common stock (each, a "Warrant" and, collectively, the "Warrants"). Each Warrant is exercisable fromAugust 8, 2018 throughAugust 8, 2023 . Warrants to purchase 1,375,000 shares of our common stock have an exercise price of$10.00 per share and Warrants to purchase 1,375,000 shares of our common stock have an exercise price of$15.00 per share. The exercise price and number of shares of common stock issuable upon the exercise of the Warrants (the "Warrant Shares") are subject to adjustment in the event of any stock dividends and splits, reverse stock split, recapitalization, reorganization or similar transaction, as described in the Warrants. Under certain circumstances, the Warrants may be exercisable on a "cashless" basis. In connection with the issuance and sale of the common stock and Warrants, we granted the Investors certain registration rights with respect to the Warrants and the Warrant Shares. The common stock and Warrants are classified as equity in accordance with Accounting Standards Codification Topic 480, Distinguishing Liabilities from Equity ("ASC 480"), and the net proceeds from the transaction were recorded as a credit to additional paid-in capital. As ofDecember 31, 2020 , none of the Warrants have been exercised. InDecember 2018 , we entered into an exchange agreement (the "Exchange Agreement") with an Investor and its affiliates (the "Exchanging Stockholders"), pursuant to which we exchanged an aggregate of 1,000,000 shares of our common stock, par value$0.00001 per share, owned by the Exchanging Stockholders for pre-funded warrants (the "Exchange Warrants") to purchase an aggregate of 1,000,000 shares of common stock (subject to adjustment in the event of any stock dividends and splits, reverse stock split, recapitalization, reorganization or similar transaction, as described in the Exchange Warrants), with an exercise price of$0.00001 per share. The Exchange Warrants will expire ten years from the date of issuance. The Exchange Warrants are exercisable at any time prior to expiration except that the Exchange Warrants cannot be exercised by the Exchanging Stockholders if, after giving effect thereto, the Exchanging Stockholders would beneficially own more than 9.99% of our common stock, subject to certain exceptions. In accordance with Accounting Standards Codification Topic 505, Equity, we recorded the retirement of the common stock exchanged as a reduction of common stock shares outstanding and a corresponding debit to additional paid-in-capital at the fair value of the Exchange Warrants on the issuance date. The Exchange Warrants are classified as equity in accordance with ASC 480, and fair value of the Exchange Warrants was recorded as a credit to additional paid-in capital and is not subject to remeasurement. We determined that the fair value of the Exchange Warrants is substantially similar to the fair value of the retired shares on the issuance date due to the negligible exercise price for the Exchange Warrants. 68
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During the year endedDecember 31, 2019 , Exchange Warrants to purchase 600,000 shares were net exercised, resulting in the issuance of 599,997 shares of common stock. As ofDecember 31, 2020 , 400,000 of the Exchange Warrants remain unexercised. InOctober 2019 , we filed a registration statement on Form S-3 (File no. 333-234414) that was declared effective as ofNovember 22, 2019 and permits the offering, issuance, and sale by us of up to a maximum aggregate offering price of$250.0 million of our common stock, preferred stock, debt securities and warrants (the "2019 Form S-3"). Up to a maximum of$75.0 million of the maximum aggregate offering price of$250.0 million may be issued and sold pursuant to an ATM financing facility under a sales agreement we entered into onNovember 27, 2019 (the "2019 Sales Agreement"). InMay 2020 , we completed an underwritten public offering of 7,000,000 shares of common stock at a public offering price of$14.00 per share and issued an additional 1,050,000 shares of our common stock at a price of$14.00 per share following the underwriters' exercise of their option to purchase additional shares. Net proceeds, after deducting underwriting commissions and offering costs paid us, were$105.3 million . We sold 2,483,719 shares of our common stock pursuant to the 2019 Sales Agreement during the year endedDecember 31, 2020 for net proceeds of$41.9 million , after deducting issuance costs. As ofDecember 31, 2020 , a total of$94.2 million of common stock remained available for sale under the 2019 Form S-3,$31.9 million of which remained available for sale under the ATM financing facility. InOctober 2019 , we entered into a credit and security agreement pursuant to which the lenders party thereto agreed to make term loans available to us for working capital and general business purposes, in a principal amount of up to$50.0 million , including a$10.0 million term loan which was funded at closing (October 30, 2019 ), with the ability to access the remaining$40.0 million in two additional tranches of$20.0 million , subject to specified availability periods, the achievement of certain clinical development milestones, minimum cash requirements and other customary conditions. InJune 2020 , we prepaid the outstanding$10.0 million balance on the term loan as well as$0.6 million for related prepayment and exit fees. We did not exercise our option to borrow the$20.0 million second tranche of Term Loans, which expired onDecember 31, 2020 , and therefore have one remaining$20.0 million tranche available under the Term Loan Credit Agreement and no related outstanding balance as ofDecember 31, 2020 . Additional information about this credit facility and our long-term debt is presented in Note 9 to the consolidated financial statements included elsewhere in this Annual Report on Form 10-K. InDecember 2020 , we filed an automatic registration statement on Form S-3ASR and an accompanying prospectus (Registration Statement No. 333-251254), pursuant to which we completed an underwritten public offering of 4,761,904 shares of common stock at a public offering price of$21.00 per share and issued an additional 714,285 shares of our common stock at a price of$21.00 per share following the underwriters' exercise of their option to purchase additional shares. Net proceeds, after deducting underwriting commissions and offering costs paid by us, were$107.6 million . This Form S-3ASR expires inDecember 2023 . Our primary uses of cash are to fund operating expenses, primarily research and development expenditures and pre-commercialization costs. Cash used to fund operating expenses is impacted by the timing of when we pay these expenses, as reflected in the change in our outstanding accounts payable and accrued expenses. We believe, based on our current operating plan and expected expenditures, that our existing cash, cash equivalents and marketable securities and access to our term loan facility will be sufficient to meet our anticipated operating and capital expenditure requirements for at least the next 12 months from the date of this filing. We have based this estimate on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we currently expect. If our planned pre-clinical and clinical trials are successful, or our other product candidates enter clinical trials or advance beyond the discovery stage, we will need to raise additional funding, which may come from raising additional capital, seeking access to additional debt, and additional collaborative or other arrangements with corporate sources in order to further advance our product candidates towards potential regulatory approval, but such funding may not be available at terms acceptable to us, if at all. We will continue to require additional financing to advance our current product candidates through clinical development, to develop, acquire or in-license
other potential 69 Table of Contents
product candidates and to fund operations for the foreseeable future. We anticipate that we will need to raise substantial additional funding, the requirements of which will depend on many factors, including:
the progress, timing, scope, results and costs of our pre-clinical studies and
? clinical trials for our product candidates, including the ability to enroll
patients in a timely manner for our clinical trials;
? the costs of and ability to obtain clinical and commercial supplies and any
other product candidates we may identify and develop;
? our ability to successfully commercialize the product candidates we may
identify and develop;
the selling and marketing costs associated with our current product candidates
? and any other product candidates we may identify and develop, including the
cost and timing of expanding our sales and marketing capabilities;
the achievement of development, regulatory and sales milestones resulting in
? payments to us from Janssen under the Janssen License and Collaboration
Agreement or other such arrangements we may enter into, and the timing of
receipt of such payments, if any;
the timing, receipt and amount of royalties under the Janssen License and
? Collaboration Agreement on worldwide net sales of PTG-200, including any
second-generation compounds, upon regulatory approval or clearance, if any;
the amount and timing of sales and other revenues from our current product
? candidates and any other product candidates we may identify and develop,
including the sales price and the availability of adequate third-party
reimbursement;
? the cash requirements of any future acquisitions or discovery of product
candidates;
? the time and cost necessary to respond to technological and market
developments;
? the extent to which we may acquire or in-license other product candidates and
technologies;
? costs necessary to attract, hire and retain qualified personnel;
? the costs of maintaining, expanding and protecting our intellectual property
portfolio; and
? the costs of ongoing general and administrative activities to support the
growth of our business.
Adequate additional funding may not be available to us on acceptable terms, or at all. Any failure to raise capital as and when needed could have a negative impact on our financial condition and on our ability to pursue our business plans and strategies. Further, our operating plans may change, and we may need additional funds to meet operational needs and capital requirements for clinical trials, other research and development activities and pre-commercialization costs. If we do raise additional capital through public or private equity offerings or convertible debt securities, the ownership interest of our existing stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect our stockholders' rights. If we raise additional capital through debt financing, we may be subject to covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. Because of the numerous risks and uncertainties associated with the development and commercialization of our product candidates, we are unable to estimate the amounts of increased capital outlays and operating expenditures associated with our current and anticipated product development programs. 70 Table of Contents
The following table summarizes our cash flows for the periods indicated:
Year Ended December 31, 2020 2019 2018 (In thousands) Cash used in operating activities$ (72,484) $ (41,527) $ (49,947) Cash (used in) provided by investing activities (90,965) (53,710) 2,213 Cash provided by financing activities 247,626 46,036 24,115
Cash Flows from Operating Activities
Cash used in operating activities for the year endedDecember 31, 2020 was$72.5 million , consisting or our net loss of$66.2 million and a net change of$19.0 million in net operating assets and liabilities, partially offset by non-cash charges of$12.7 million . Non-cash charges were primarily comprised of$7.9 million of stock-based compensation,$1.8 million of operating lease ROU asset amortization, a$1.4 million change in net deferred tax asset,$0.8 million of depreciation and amortization, a$0.6 million loss on early prepayment of long-term debt and$0.2 million of amortization of debt issuance costs and accretion of debt discount. The change in net operating assets and liabilities was primarily due to a decrease of$27.0 million in deferred revenue related to the Janssen License and Collaboration Agreement, a$1.9 million decrease in operating lease liability, a$1.1 million increase in prepaid expenses and other assets and a$1.0 million increase inAustralia research and development refundable cash tax incentive receivable, partially offset by an increase of$5.8 million in accrued expenses and other liabilities, a decrease of$4.3 million in receivable from collaboration partner, an increase of$1.5 million in payable to collaboration partner, an increase of$0.3 million in accounts payable, and an increase of$0.1 million in other liability. Cash used in operating activities for the year endedDecember 31, 2019 was$41.5 million , consisting of our net loss of$77.2 million , partially offset by a net change of$26.1 million in net operating assets and liabilities and non-cash charges of$9.5 million . The change in net operating assets and liabilities was primarily due to a net increase of$33.5 million in deferred revenue related to the Janssen License and Collaboration Agreement, a decrease of$1.4 million in research and development refundable cash tax incentive receivable and an increase of$1.1 million in accrued expenses and other payables, partially offset by an decrease of$3.0 million in accounts payable, an increase of$2.8 million in prepaid expenses and other assets, an increase of$2.2 million in receivable from collaboration partner and a decrease of$1.9 million in operating lease liability. Non-cash charges were primarily comprised of$8.4 million of stock-based compensation,$1.8 million of operating lease right-of-use asset amortization and$0.7 million of depreciation and amortization, partially offset by a$0.8 million increase in deferred tax assets and$0.6 million of net accretion of discount on marketable securities. Cash used in operating activities for the year endedDecember 31, 2018 was$49.9 million , consisting of our net loss of$38.9 million and a net change of$18.0 million in net operating assets and liabilities, partially offset by non-cash charges of$7.0 million . The change in net operating assets and liabilities was primarily due to a net decrease of$23.5 million in deferred revenue related to the Janssen License and Collaboration Agreement and an increase of$2.8 million in receivable from collaboration partner, partially offset by an increase of$4.4 million in accounts payable, an increase of$1.9 million in accrued expenses and other payables, an increase of$1.1 million in payable to collaboration partner and a decrease of$1.1 million in prepaid expenses and other assets. Non-cash charges were primarily comprised of$6.9 million of stock-based compensation,$0.5 million of depreciation and amortization and$0.2 million of net amortization of premium on marketable securities, partially offset by a$0.7 million increase in deferred tax assets.
Cash Flows from Investing Activities
Cash used in investing activities for the year endedDecember 31, 2020 was$91.0 million , consisting of purchases of marketable securities of$280.0 million and purchases of property and equipment of$0.5 million , partially offset by proceeds from maturities of marketable securities of$189.5 million . Purchases of property and equipment were primarily related to purchases of laboratory equipment, furniture and computer equipment. 71
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Cash used in investing activities for the year endedDecember 31, 2019 was$53.7 million , consisting of purchases of marketable securities of$166.9 million and purchases of property and equipment of$1.0 million , partially offset by proceeds from maturities of marketable securities of$114.2 million . Purchases of property and equipment were primarily related to purchases of scientific equipment and leasehold improvements. Cash provided by investing activities for the year endedDecember 31, 2018 was$2.2 million , consisting of proceeds from marketable securities of$73.8 million , partially offset by purchases of marketable securities of$71.1 million and purchases of property and equipment of$0.5 million . Purchases of property and equipment were primarily related to purchases of scientific equipment.
Cash Flows from Financing Activities
Cash provided by financing activities for the year endedDecember 31, 2020 was$247.6 million , consisting primarily of cash proceeds from our public offerings of common stock of$213.3 million , cash proceeds from ATM sales of$42.1 million , and proceeds from the issuance of common stock upon exercise of stock options and purchases of common stock under our employee stock purchase plan of$2.8 million , partially offset by early repayment of long-term debt of$10.5 million . Cash provided by financing activities for the year endedDecember 31, 2019 was$46.0 million , consisting of$34.5 million of net proceeds from sales of common stock through our ATM financing facility,$9.8 million of net proceeds from long-term debt and$1.8 million from the issuance of common stock upon exercise of stock options and purchases of common stock under our employee stock purchase plan. Cash provided by financing activities for the year endedDecember 31, 2018 was$24.1 million , consisting of$21.7 million of net proceeds from issuance of our common stock and warrants in a private placement,$1.5 million of net proceeds from sales through our ATM financing facility and$0.9 million from the issuance of common stock upon exercise of stock options and purchases of common stock under our employee stock purchase plan.
Contractual Obligations and Other Commitments
Our contractual obligations include minimum lease payments under our operating lease obligations. See Note 10 to the consolidated financial statements elsewhere in this Annual Report on Form 10-K for additional information.
We enter into agreements in the normal course of business with contract research organizations for clinical trials and with vendors for pre-clinical studies and other services and products for operating purposes, which are cancelable at any time by us, generally upon 30 to 60 days prior written notice. Under the Janssen License and Collaboration Agreement, we share with Janssen certain development, regulatory and compound supply costs. The actual amounts that we pay Janssen or that Janssen pays us will depend on numerous factors, some of which are outside of our control and some of which are contingent upon the success of certain development and regulatory activities. InJune 2012 , we entered into a Research Collaboration and License Agreement with Zealand Pharma A/S to identify, optimize and develop novel disulfide-rich peptides to discover a hepcidin mimetic. We amended this agreement onFebruary 28, 2014 , at which point Protagonist assumed responsibility for the development program. See "Item 3. Legal Proceedings", "Item 7. Management's Discussion and Analysis - Contractual Obligations and Other Commitments" and Note 7 and Note 11 to the Consolidated Financial Statements included elsewhere in this Annual Report on Form 10-K for additional information. 72 Table of Contents
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