The following discussion contains forward-looking statements that involve risks
and uncertainties. Our actual results could differ materially from those
discussed here. Factors that could cause or contribute to such differences
include, but are not limited to, those discussed in this section as well as
factors described in "Part I, Item 1A - Risk Factors."
Overview
Strategic Direction of Our Business
  Nektar Therapeutics is a research-based biopharmaceutical company that
discovers and develops innovative new medicines in areas of high unmet medical
need. Our research and development pipeline of new investigational drugs
includes treatments for cancer, autoimmune disease and viral infections. We
leverage our proprietary and proven chemistry platform to discover and design
new drug candidates. These drug candidates utilize our advanced polymer
conjugate technology platforms, which are designed to enable the development of
new molecular entities that target known mechanisms of action. We continue to
make significant investments in building and advancing our pipeline of
proprietary drug candidates as we believe that this is the best strategy to
build long-term stockholder value.
In immuno-oncology (I-O), we are executing a clinical development program
evaluating bempegaldesleukin (previously referred to as NKTR-214) in combination
with Opdivo®, in collaboration with Bristol-Myers Squibb Company (BMS) as well
as other independent development work evaluating bempegaldesleukin in
combination with other checkpoint inhibitors and agents with potential
complementary mechanisms of action. We announced in August of 2019 that the FDA
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granted a Breakthrough Therapy designation for bempegaldesleukin in combination
with Opdivo® for the treatment of patients with untreated unresectable or
metastatic melanoma. We expect our research and development expense to continue
to grow over the next few years as we expand and execute our broad clinical
development program for bempegaldesleukin.
On January 9, 2020, we and BMS entered into Amendment No. 1 (the Amendment) to
the February 13, 2018, Strategic Collaboration Agreement (the BMS Collaboration
Agreement). Pursuant to the Amendment, we and BMS agreed to update the
Collaboration Development Plan under which we are collaborating and developing
bempegaldesleukin. Specifically, pursuant to the updated Collaboration
Development Plan, bempegaldesleukin in combination with Opdivo® is currently
being evaluated in ongoing registrational trials in first-line metastatic
melanoma, first-line cisplatin ineligible, PD-L1 low, locally advanced or
metastatic urothelial cancer, first-line metastatic renal cell carcinoma (RCC),
muscle-invasive bladder cancer, and adjuvant melanoma, as well as a Phase 1/2
dose escalation and expansion study to evaluate bempegaldesleukin plus Opdivo®
in combination with either axitinib or cabozantinib in first line RCC in order
to support a future Phase 3 registrational trial. Several other
registrational-supporting pediatric and safety studies for the combination of
bempegaldesleukin and Opdivo® are currently underway.
The Amendment did not alter the cost-sharing methodology under the BMS
Collaboration Agreement. The parties share development costs based on each
party's relative ownership interest in the compounds included in the regimen.
For example, we share clinical development costs for bempegaldesleukin in
combination with Opdivo®, BMS 67.5% and Nektar 32.5%. For costs of manufacturing
bempegaldesleukin, however, BMS is responsible for 35% and Nektar is responsible
for 65% of costs. BMS supplies Opdivo® free of charge. We also share
commercialization related costs, 35% BMS and 65% Nektar, which we present in
general and administrative expense. Our share of development costs is limited to
an annual cap of $125.0 million. To the extent this annual cap is exceeded, BMS
reimburses us for the excess, but we recognize our full share of the research
and development expense and recognize the reimbursement as a liability. We repay
the liability to the extent that our share of development costs is less than the
annual cap in a future year, or by reducing a portion of our share of net
profits following the first commercial sale of bempegaldesleukin, if approved.
The BMS Collaboration Agreement entitles Nektar to receive up to $1.455 billion
of clinical, regulatory and commercial launch milestones. Of these milestones,
we received a non-refundable, creditable milestone payment of $25.0 million for
the first patient, first visit in the registrational muscle-invasive bladder
cancer trial, which was achieved on January 30, 2020, and also received a
non-refundable, non-creditable milestone payment of $25.0 million for the first
patient, first visit in the registrational adjuvant melanoma trial, which we
achieved on July 27, 2020. Of the remaining milestones, $625.0 million are
associated with the approval and launch of bempegaldesleukin in its first
indication in the U.S., EU and Japan (which reflects the reduction for the $25.0
million nonrefundable, creditable milestone for the first patient, first visit
in the muscle-invasive bladder cancer trial). As a result, whether and when
bempegaldesleukin is approved in any indication will have a significant impact
on our future results of operations and financial condition.
Outside of the Collaboration Development Plan with BMS, we are conducting and
pursuing additional I-O research and development activities evaluating
bempegaldesleukin in combination with other agents that have potential
complementary mechanisms of action. For example, on February 12, 2021, we
entered into a financing and co-development collaboration with SFJ
Pharmaceuticals to support a Phase 2/3 registrational clinical study of
bempegaldesleukin plus Keytruda® in patients with head and neck cancer whose
tumors express PD-L1. In addition, we are independently studying
bempegaldesleukin in combination with Keytruda® in a non-small cell lung cancer
(NSCLC) Phase 1/2 trial. Our strategic objective is to establish
bempegaldesleukin as a key component of many I-O combination regimens with the
potential to enhance the standard of care in multiple oncology settings. As a
result, we expect to continue to make significant and increasing investments
exploring the potential of bempegaldesleukin with mechanisms of action that we
believe are synergistic with bempegaldesleukin based on emerging scientific
findings in cancer biology and preclinical development work.
With our non-BMS clinical collaborations for bempegaldesleukin, generally each
party supports the collaboration based on its expertise and resources. For
example, our co-development collaboration agreement with SFJ includes both
financial support in the form of up to $150.0 million to fund the Phase 2/3
registrational clinical study of bempegaldesleukin plus Keytruda® in head and
neck cancer, as well as operational support in managing the clinical trial. In
addition, we announced on February 17, 2021, that we had entered into a clinical
trial collaboration and supply agreement with Merck wherein we will receive
supplies of Keytruda® at no cost to us.
On October 22, 2020, we received FDA clearance for an Investigational New Drug
application for bempegaldesleukin to be evaluated in a Phase 1b clinical study
in adult patients who have been diagnosed with mild COVID-19 infection. The
study design allows us to evaluate whether bempegaldesleukin's adaptive
immune-stimulating mechanism to promote priming and proliferation of T cells and
NK cells could be useful in the emerging treatment options for COVID-19.
Enrollment in the Phase 1b randomized, double-blind, placebo-controlled study is
planned to start in early November.
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We are also combining bempegaldesleukin with NKTR-262. NKTR-262 is a small
molecule agonist that targets toll-like receptors (TLRs) found on innate immune
cells in the body. NKTR-262 is designed to stimulate the innate immune system
and promote maturation and activation of antigen-presenting cells (APCs), such
as dendritic cells, which are critical to induce the body's adaptive immunity
and create antigen-specific cytotoxic T cells. NKTR-262 is being developed as an
intra-tumoral injection in combination with systemic bempegaldesleukin to induce
an abscopal response and achieve the goal of tumor regression in cancer patients
treated with both therapies. The Phase 1/2 dose-escalation and expansion trial
in patients with solid tumors is currently ongoing.

Our next most advanced I-O program is NKTR-255. NKTR-255 is a biologic that
targets the IL-15 pathway in order to activate the body's innate and adaptive
immunity. Activation of the IL-15 pathway enhances the survival and function of
NK cells and induces survival of both effector and CD8 memory T cells.
Recombinant human IL-15 is rapidly cleared from the body and must be
administered frequently and in high doses limiting its utility due to toxicity.
Through optimal engagement of the IL-15 receptor complex, NKTR-255 is designed
to enhance functional NK cell populations and formation of long-term
immunological memory, which may lead to sustained anti-tumor immune response.
Preclinical findings suggest NKTR-255 has the potential to synergistically
combine with antibody-dependent cellular toxicity molecules as well as enhance
CAR-T therapies. We have initiated a Phase 1 dose escalation and expansion
clinical study of NKTR-255 in adults with relapsed or refractory non-Hodgkin
lymphoma or multiple myeloma, as well as a Phase 1/2 clinical study of NKTR-255
in patients with relapsed or refractory head and neck squamous cell carcinoma or
colorectal cancer. At the 2020 Society for Immunotherapy of Cancer (SITC) Annual
Meeting, we reported early findings from the Phase 1 dose escalation study that
demonstrated expansion of lymphocytes, increases in NK and CD8+ T cells in
patients with multiple myeloma and non-Hodgkin lymphoma.
In immunology, we are developing NKTR-358, which is designed to correct the
underlying immune system imbalance in the body that occurs in patients with
autoimmune disease. NKTR-358 is designed to optimally target the IL-2 receptor
complex in order to stimulate proliferation and growth of regulatory T cells.
NKTR-358 is being developed as a once or twice monthly self-administered
injection for a number of autoimmune diseases. In 2017, we entered into a
worldwide license agreement with Eli Lilly and Company (Lilly) to co-develop
NKTR-358. We received an initial payment of $150.0 million in September 2017 and
are eligible for up to an additional $250.0 million for development and
regulatory milestones. We were responsible for completing Phase 1 clinical
development and certain drug product development and supply activities. We also
share Phase 2 development costs with Lilly, with Lilly responsible for 75% and
Nektar responsible for 25% of these costs. We will have the option to contribute
funding to Phase 3 development on an indication-by-indication basis, ranging
from zero to 25% of the Phase 3 development costs and receive a royalty rate on
global NKTR-358 sales up to the low twenties based upon our Phase 3 development
cost contribution and the level of annual global product sales. Lilly will be
responsible for all costs of global commercialization and we will have an option
to co-promote in the U.S. under certain conditions.
We have completed a Phase 1 dose-finding trial of NKTR-358 to evaluate
single-ascending doses of NKTR-358 in approximately 100 healthy subjects.
Results from this study demonstrated a multiple-fold increase in regulatory T
cells with no change in CD8 positive or natural killer cell levels and no
dose-limiting toxicities were observed. We also completed treatment of a Phase 1
multiple-ascending dose trial to evaluate NKTR-358 in patients with SLE. Lilly
is conducting two Phase 1b studies in patients with psoriasis and atopic
dermatitis and has initiated Phase 2 studies in SLE and ulcerative colitis.
Under the terms of the agreement, Lilly is to initiate two additional Phase 2
studies in other auto-immune diseases.
We were developing NKTR-181 for the treatment of chronic low back pain in adult
patients and had submitted an NDA for NKTR-181. At the FDA advisory committee
meeting held on January 14, 2020, the joint FDA Anesthetic Drug Products
Advisory Committee and Drug Safety and Risk Management Committee did not
recommend approval of NKTR-181, and, as a result, we withdrew the NDA and
decided to make no further investment commitments to this program.
The level of our future research and development investment will depend on a
number of uncertainties including clinical outcomes, future studies required to
advance programs to regulatory approval, and the economics related to potential
future collaborations that may include up-front payments, development funding,
milestones, and royalties. Over the next several years, we plan to continue to
make significant investments to advance our early drug candidate pipeline.
We have historically derived all of our revenue and substantial amounts of
operating capital from our collaboration agreements including the BMS
Collaboration Agreement, pursuant to which we have recognized $1.11 billion in
revenue and recorded $790.2 million in additional paid in capital for shares of
our common stock issued in the transaction. While in the near-term we continue
to expect to generate substantially all of our revenue from collaboration
arrangements, including the potential remaining $1.405 billion in development
and regulatory milestones under the BMS collaboration, in the medium- to
long-term, our plan is to generate significant commercial revenue from our
proprietary drugs including bempegaldesleukin. Since we do not have experience
commercializing products or an established commercialization organization, there
will be substantial risks and uncertainties in future years as we build
commercial, organizational, and operational capabilities.
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Up until September 30, 2020, we received royalties and milestones from two
approved drugs: MOVANTIK®, for which we have a collaboration with AstraZeneca;
and ADYNOVATE®, for which we have collaboration agreement with Baxalta Inc. (a
wholly owned-subsidiary of Takeda Pharmaceutical Company Ltd.). MOVANTIK® is an
oral, peripherally-acting mu-opioid antagonist for the treatment of
opioid-induced constipation in adult patients with non-cancer pain which was
approved by the FDA and subsequently launched in March 2015 (wherein in the EU,
MOVANTIK® is sold as MOVENTIG® and is indicated for the treatment of
opioid-induced constipation in adult patients who have an inadequate response to
laxatives, which was approved by health authorities in the European Union and
many other countries beginning in 2014). ADYNOVATE®, a half-life extension
product of Factor VIII was approved by the FDA in late 2015 for use in adults
and adolescents, aged 12 years and older, who have Hemophilia A (wherein in the
EU, ADYNOVATE® is sold as ADYNOVI™ and was approved by health authorities in
Europe in January 2018, and has also been approved in many other countries).
Beginning on October 1, 2020, our rights to receive royalties arising from the
worldwide net sales of MOVANTIK®/MOVANTIG® and ADYNOVATE®/ADYNOVI®, as well as
REBINYN® and specified licensed products under a Right to Sublicense Agreement,
dated October 27, 2017, were sold for $150.0 million pursuant to a capped sale
arrangement to entities managed by Healthcare Royalty Management, LLC
(collectively, HCR) pursuant to a purchase and sale agreement (the 2020 Purchase
and Sale Agreement) entered into on December 16, 2020. With regard to the capped
sale arrangement, the 2020 Purchase and Sale Agreement will automatically
expire, and HCR's right to receive the sold royalties, will cease when HCR has
received payments of equalling $210.0 million (the 2025 Threshold), if the 2025
Threshold is achieved on or prior to December 31, 2025, or $240.0 million, if
the 2025 Threshold is not achieved on or prior to December 31, 2025 (or, if
earlier, the date on which the last royalty payment under the relevant license
agreements is made). After the 2020 Purchase and Sale Agreement expires, all
rights to receive these royalties return to Nektar.
Our business is subject to significant risks, including the risks inherent in
our development efforts, the results of our clinical trials, our dependence on
the clinical development and commercialization efforts by our collaboration
partners, uncertainties associated with obtaining and enforcing patents, the
lengthy and expensive regulatory approval process and competition from other
products. For a discussion of these and some of the other key risks and
uncertainties affecting our business, see Item 1A. Risk Factors.
While the approved drugs and clinical development programs described above are
key elements of our future success, we believe it is critically important that
we continue to make substantial investments in our earlier-stage drug candidate
pipeline. We have several drug candidates in earlier stage clinical development
or being explored in research that we are preparing to advance into the clinic
in future years. We are also advancing several other drug candidates in
preclinical development in the areas of I-O, immunology, and other therapeutic
indications. We believe that our substantial investment in research and
development has the potential to create significant value if one or more of our
drug candidates demonstrates positive clinical results, receives regulatory
approval in one or more major markets and achieves commercial success. Drug
research and development is an inherently uncertain process with a high risk of
failure at every stage prior to approval. The timing and outcome of clinical
trial results are extremely difficult to predict. Clinical development successes
and failures can have a disproportionately positive or negative impact on our
scientific and medical prospects, financial condition and prospects, results of
operations and market value.
Effects of the COVID-19 Pandemic
In March 2020, COVID-19, the disease resulting from a novel strain of
coronavirus infection, was declared a global pandemic. Many countries, including
the United States and India, initially took steps such as restricting travel,
closing schools, and issuing shelter-in-place orders to slow or moderate the
spread of the virus. More recently, states and countries have adopted
individualized approaches to respond to the COVID-19 pandemic. In particular,
local resurgences in number and rates of infections, and the further spread of
the virus may result in the return of prior restrictions or the institution of
restrictions in the affected areas. Although vaccines intended to reduce the
incidence of infection are in development, it remains unclear how long the
negative impacts caused by the coronavirus will continue into the future.
Currently, with respect to the operation of our facilities, we are closely
adhering to applicable guidelines and orders. Essential operations in research,
manufacturing and maintenance that occur within our facilities are continuing in
accordance with the permissions granted under government ordinances. Across all
our locations, we have instituted a temporary work from home policy for all
office personnel who do not need to work on site to maintain productivity. At
this time, we have not identified a material change to our productivity as a
result of these measures, but this could change, particularly if restricted
travel, closed schools, and shelter-in-place orders are not removed or
significantly eased in the areas in which we operate.
The safety and well-being of our employees, and the patients and healthcare
providers in our clinical trial programs, are of first and foremost importance
to us. We believe that the safety measures we are taking and instructing our
contractors to
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take in response to the COVID-19 pandemic meet or exceed the guidance and
requirements issued from government and public health officials.
We and our partners are currently engaged in the clinical testing of our
proprietary drug candidates and the COVID-19 pandemic introduces significant
challenges to our clinical development programs which are central to our
business. The evolving situation around the COVID-19 pandemic, along with the
resulting public health guidance measures that have been put into place, have
thus far had varying impacts on the clinical testing of our proprietary drug
candidates depending on the therapeutic indication, geographic distribution of
clinical trial sites, the clinical trial stage, and, in certain cases, our
partners' general corporate approach to the COVID-19 pandemic. The rapid
development and fluidity of the COVID-19 pandemic precludes any firm estimates
as to the ultimate effect this disease will have on our clinical trials, our
operations and our business. As a result, any current assessment of the effects
of the COVID-19 pandemic, including the impact of this disease on our specific
clinical programs as discussed below, is difficult to predict and subject to
change.
Specifically, for the ongoing registrational clinical trials studying the
combination of bempegaldesleukin and Opdivo® in cancer indications being led by
Nektar (such as adjuvant melanoma, RCC and first-line cisplatin ineligible,
PD-L1 low, locally advanced or metastatic urothelial cancer), although we have
not seen evidence to date that the COVID-19 pandemic has had a significant
impact on enrollment for these trials, the future impact of the COVID-19
pandemic on these trials is very difficult to predict and, with regard to
individual clinical trial sites within these studies, will likely vary by the
geographic region in which they are located.
For Nektar's Phase 1/2 trial studying bempegaldesleukin and Keytruda® in NSCLC,
although the COVID-19 pandemic delayed the initiation of certain investigator
sites in Europe earlier in the trial, we currently expect to have initial safety
as well as preliminary overall response rate data for the dose-escalation and
0.006 mg/kg NSCLC expansion cohorts of this study in the second half of 2021.
With regard to Nektar's ongoing clinical study of NKTR-262 (the Phase 1/2 REVEAL
study), this study has largely remained on track although we have experienced
some challenges with new investigator site initiations. Nektar's Phase 1
clinical study of NKTR-255 in patients with relapsed/refractory hematologic
malignancies has enrolled slower than anticipated due to challenges caused by
the COVID-19 pandemic, and the dose-escalation monotherapy portion of the study
is expected to be completed in the first half of 2021. For both of these
Nektar-run clinical programs, the ongoing COVID-19 pandemic could still impact
investigator site initiations and trial enrollment despite our mitigation
efforts.
For clinical studies of our proprietary drug candidates being run by our
partners, BMS is enrolling patients in each of the BMS-led registration studies
and has re-started initiation of new investigator sites in the third quarter of
2020 following a pause in the initiation of new investigator sites it instituted
for all of its studies as a result of the COVID-19 pandemic. In the summer of
2020, BMS extended their timeline estimates by approximately six months for the
first data read-outs for the first-line melanoma trial. We will continue to
monitor the progress of enrollment of the BMS-led studies and projections for
topline clinical outcome data. Our partner Lilly, which is running clinical
trials of NKTR-358, has indicated it will likely have delays of at least three
to six months following its temporary suspension of recruitment for the ongoing
Phase 1b studies in atopic dermatitis and psoriasis as a result of the COVID-19
pandemic. Lilly recently started a Phase 2 study in moderate to severe lupus
patients in October and has initiated an additional Phase 2 study in ulcerative
colitis. The rapid development and fluidity of the COVID-19 pandemic preclude
any firm estimates as to the ultimate effect this disease will have on our
collaborators' clinical trials. As a result, there remains substantial
uncertainty as to potential impacts on our collaboration partner studies.
With regard to our IND-enabling research, although the COVID-19 pandemic has
caused us to reduce the number of employees working at our sites, a subset of
our research-based employees continues to conduct laboratory work in our
research facilities (which is permitted under the applicable government
ordinances). As a result, we continue to make progress in the identification of
new drug candidates.
In an effort to mitigate the negative effects of the COVID-19 pandemic on our
clinical trials (both in terms of clinical trial timelines and integrity of
clinical study data), we have taken steps to help our clinical trial
investigators and their teams continue to provide care and uninterrupted access
to their patients. Particularly, in the context of our clinical trials directed
to investigational cancer treatments, for example, we are actively working with
our study sites to implement measures to prevent study protocol violations, to
minimize any disruption of treatment visits, to accommodate for patient visit
delays caused by limited access to healthcare facilities, to leverage
alternative methods for maintaining clinical trial integrity, and to properly
record patient event data that may be influenced by the COVID-19 pandemic. In
addition, to the extent that the integrity of individual patient data is
negatively affected by the COVID-19 pandemic, we will consider measures to
maintain the integrity of the clinical study overall (such as over-enrolling
patients into the study and removing all patients originating from an affected
study site when performing statistical analyses of study endpoints). Although
these measures may have the benefit of preserving the overall integrity of a
clinical study, implementing these measures could result in a delay in
completing the study.
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In this respect, we are also incorporating recent direction and flexibility
provided by regulatory authorities, including the FDA in its March 18, 2020
Guidance (most recently updated January 27, 2021) entitled "FDA Guidance on
Conduct of Clinical Trials of Medicinal Products during COVID-19 Public Health
Emergency." This Guidance is continually being updated by FDA and updates can be
found on the FDA's website at www.fda.gov. In addition, we may refer to guidance
documents from other regulatory agencies, such as, for example, the European
Medicines Agency's "Implications of coronavirus disease (COVID-19) on
methodological aspects of ongoing clinical trials" found on www.ema.europa.eu,
which are also continually being updated.
With respect to financing our near-term business needs, as set forth below in
"Key Developments and Trends in Liquidity and Capital Resources," we estimate we
have working capital to fund our current business plans through at least the
next twelve months.
Key Developments and Trends in Liquidity and Capital Resources
  We estimate that we have working capital to fund our current business plans
for at least the next twelve months from the date of filing. At December 31,
2020, we had approximately $1.2 billion in cash and investments in marketable
securities. On April 13, 2020, we repaid the principal and accrued interest of
our senior notes totaling $254.8 million. See Note 5 to our Consolidated
Financial Statements for additional information.
Results of Operations
Years Ended December 31, 2020 and 2019
  Additional information required by Item 7 for the year ended December 31, 2018
can be found in Item 7 in our Annual Report on Form 10-K for the year December
31, 2019, filed with the SEC on February 28, 2020 and is incorporated herein by
reference.
Revenue (in thousands, except percentages)
                                                                                                                            Percentage
                                                                                                   Increase/                 Increase/
                                                         Year Ended December 31,                  (Decrease)                (Decrease)
                                                         2020                   2019             2020 vs. 2019             2020 vs. 2019
Product sales                                    $      17,504              $  20,117          $       (2,613)                        (13) %
Royalty revenue                                         30,999                 41,222                 (10,223)                        (25) %
Non cash royalty revenue related to sale of
future royalties                                        48,563                 36,303                  12,260                          34  %
License, collaboration and other revenue                55,849                 16,975                  38,874                         > 100%
Total revenue                                    $     152,915              $ 114,617          $       38,298                          33  %


  Our revenue is derived from our collaboration agreements, under which we may
receive product sales revenue, royalties, and license fees, as well as
development and sales milestones and other contingent payments. We recognize
revenue when we transfer promised goods or services to our collaboration
partners. The amount of upfront fees received under our license and
collaboration agreements allocated to continuing obligations, such as
development or manufacturing and supply commitments, is generally recognized as
we deliver products or provide development services. As a result, there may be
significant variations in the timing of receipt of cash payments and our
recognition of revenue. We make our best estimate of the timing and amount of
products and services expected to be required to fulfill our performance
obligations. Given the uncertainties in research and development collaborations,
significant judgment is required to make these estimates.
Product sales

Product sales include predominantly fixed price manufacturing and supply agreements with our collaboration partners and are the result of firm purchase orders from those partners. The timing of shipments is based solely on the demand and requirements of our collaboration partners and is not ratable throughout the year.


  Product sales decreased for the year ended December 31, 2020 as compared to
the year ended December 31, 2019 due to decreased demand from our collaboration
partners.

We expect product sales in 2021 to increase compared to 2020 due to increased demand from our collaboration partners.


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Royalty revenue
  As discussed in Note 7 to our Consolidated Financial Statements, on December
16, 2020, we entered into the 2020 Purchase and Sale Agreement with entities
managed by Healthcare Royalty Management, LLC (collectively, HCR), under which
we agreed to sell to HCR certain of our rights to receive royalty payments
arising on worldwide net sales of MOVANTIK®, ADYNOVATE® and REBINYN® beginning
October 1, 2020. As a result, we recognized royalty revenue for these products
only for the nine months ended September 30, 2020, and recognized these
royalties as non-cash royalty revenue for the three months ended December 31,
2020. Accordingly, royalty revenue decreased for the year ended December 31,
2020 as compared to the year ended December 31, 2019. Please see Note 7 to our
Consolidated Financial Statements for additional information on the 2020
Purchase and Sale Agreement.
We do not expect to recognize any royalty revenue during 2021, because we will
recognize all such royalties as non-cash royalty revenue as a result of the 2020
Purchase and Sale Agreement.
Non-cash royalty revenue related to sale of future royalties

For a discussion of our Non-cash royalty revenue, please see our discussion below "Non-Cash Royalty Revenue and Non-Cash Interest Expense." License, collaboration and other revenue


  License, collaboration and other revenue includes the recognition of upfront
payments, milestone and other contingent payments received in connection with
our license and collaboration agreements and certain research and development
activities. The level of license, collaboration and other revenue depends in
part upon the estimated recognition period of the upfront payments allocated to
continuing performance obligations, the achievement of milestones and other
contingent events, the continuation of existing collaborations, the amount of
research and development work, and entering into new collaboration agreements,
if any.
  During the year ended December 31, 2020, pursuant to the BMS Collaboration
Agreement, we recognized $25.0 million for the achievement of the first patient,
first visit in the registrational muscle-invasive bladder cancer trial, which
was achieved on January 30, 2020, and $25.0 million for the achievement of the
first patient, first visit in the registrational adjuvant melanoma trial, which
we achieved on July 27, 2020. As a result of these milestones, license,
collaboration and other revenue increased during the year ended December 31,
2020 as compared to the year ended December 31, 2019.
  We expect that our license, collaboration and other revenue will decrease in
2021 compared to 2020 as a result of the recognition of these milestones in 2020
under our BMS Collaboration Agreement.
  The timing and future success of our drug development programs and those of
our collaboration partners are subject to a number of risks and uncertainties.
See Item 1A. Risk Factors for discussion of the risks associated with the
complex nature of our collaboration agreements.
Revenue by geography (in thousands)

Revenue by geographic area is based on the headquarters or shipping locations of our partners. The following table sets forth revenue by geographic area:


                        Year Ended December 31,
                          2020               2019
United States     $      64,966           $  27,093
Rest of World            87,949              87,524
Total revenue     $     152,915           $ 114,617

Revenue attributable to the U.S. for the year ended December 31, 2020 was higher than for the year ended December 31, 2019 primarily due to the recognition of $50.0 million of milestones from the BMS Collaboration Agreement as described above.


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Cost of goods sold (in thousands, except percentages)

                                                                                                                   Percentage
                                                     Year Ended December 31,                Increase/              Increase/
                                                                                            (Decrease)             (Decrease)
                                                                                             2020 vs.               2020 vs.
                                                   2020                    2019                2019                   2019
Cost of goods sold                            $    19,477               $ 21,374          $    (1,897)                      (9) %
Product gross profit (loss)                   $    (1,973)              $ (1,257)         $      (716)                     (57) %
Product gross margin                                  (11)  %                 (6) %


  Our strategy is to manufacture and supply polymer reagents to support our
proprietary drug candidates or our third-party collaborators where we have a
strategic development and commercialization relationship or where we derive
substantial economic benefit. We have elected to only enter into and maintain
those manufacturing relationships associated with long-term collaboration
agreements which include multiple sources of revenue, which we view holistically
and in aggregate. We have a predominantly fixed cost base associated with our
manufacturing activities. As a result, our product gross profit and margin are
significantly impacted by the mix and volume of products sold in each period.
  Product gross margin worsened for the year ended December 31, 2020 compared to
the year ended December 31, 2019 primarily due to a less favorable product mix
in 2020 compared to 2019. We have a manufacturing arrangement with a partner
that includes a fixed price which is less than the fully burdened manufacturing
cost for the reagent, and we expect this situation to continue with this partner
in future years. In addition to product sales from reagent materials supplied to
the partner where our sales are less than our fully burdened manufacturing cost,
we also receive royalty revenue from this collaboration. In the years ended
December 31, 2020 and 2019, the royalty revenue from this collaboration exceeded
the related negative gross profit.
  We expect product gross margin to continue to fluctuate in future periods
depending on the level and mix of manufacturing orders from our customers. We
currently expect product gross margin to be negative in 2021 as a result of the
anticipated unfavorable product mix described above.
Research and development expense (in thousands, except percentages)

                                                                                                                       Percentage
                                                            Year Ended December 31,              Increase/             Increase/
                                                                                                (Decrease)             (Decrease)
                                                                                                 2020 vs.               2020 vs.
                                                         2020                   2019               2019                   2019
Research and development expense                 $     408,678              $ 434,566          $  (25,888)                      (6) %


  Research and development expense consists primarily of clinical study costs,
contract manufacturing costs, direct costs of outside research, materials,
supplies, licenses and fees as well as personnel costs (including salaries,
benefits, and stock-based compensation). Research and development expense also
includes certain overhead allocations consisting of support and
facilities-related costs. Where we perform research and development activities
under a clinical joint development collaboration, such as our collaboration with
BMS, we record the expense reimbursement from our partners as a reduction to
research and development expense, and we record our share of our partners'
expenses as an increase to research and development expense.
  Research and development expense decreased for the year ended December 31,
2020 compared to the year ended December 31, 2019. The clinical trial costs for
our bempegaldesleukin, NKTR-255 and NKR-262 programs increased for the year
ended December 31, 2020 compared to the year ended December 31, 2019. These
increased costs were offset by decreases in pre-commercial manufacturing costs
for NKTR-181 which we incurred during 2019, manufacturing costs for clinical
trials materials, and costs for our clinical development program for NKTR-358.
As discussed above, as a result of our decision to withdraw the NKTR-181 NDA in
January 2020, we present all costs related to the wind-down of the NKTR-181
program, including pre-commercial manufacturing activities, in the Impairment of
assets and other costs related to terminated program line in our Consolidated
Statements of Operations for the year ended December 31, 2020. The decrease in
NKTR-358 development costs reflects the completion of our Phase 1 clinical
development and drug product development deliverables, for which we were
responsible for 100% of costs, to the Phase 1b and Phase 2 development, for
which we are responsible for 25% of costs and Lilly is responsible for 75% of
costs. Additionally, during the years ended December 31, 2020 and 2019, we
recorded net reductions to research and development expense for BMS'
reimbursements of our costs of $128.2 million and $105.4 million,
respectively. Under the BMS Collaboration Agreement, BMS generally bears 67.5%
of development costs for bempegaldesleukin in combination with Opdivo® and 35%
of costs for manufacturing bempegaldesleukin. Please see Note 10 to our
Consolidated Financial Statements for additional information regarding our BMS
Collaboration Agreement.
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  We utilize our employee and infrastructure resources across multiple
development and research programs. The following table shows expenses incurred
for clinical and regulatory services, clinical supplies, and preclinical study
support provided by third parties as well as contract manufacturing costs for
each of our drug candidates. The table also presents other costs and overhead
consisting of personnel, facilities and other indirect costs (in thousands):

                                                                  Clinical                   Year Ended December 31,
                                                                   Study
                                                                 Status(1)                   2020                   2019

Bempegaldesleukin (CD122-preferential IL-2 pathway agonist)(2)

                                                     Phase 1/2/3          $     131,900              $ 109,355
NKTR-358 (cytokine Treg stimulant)                               Phase 1/2                  20,153                 27,319
NKTR-255 (IL-15 receptor agonist)                                 Phase 1                   14,542                 12,278
NKTR-262 (toll-like receptor agonist)                            Phase 1/2                   8,928                 11,379
ONZEALDTM (next-generation topoisomerase I inhibitor)            Terminated                  4,313                 12,733

NKTR-181 (orally-available mu-opioid analgesic molecule) Terminated

                  1,931                 29,830
Other drug candidates                                             Various                   13,332                 18,585

Total clinical development, contract manufacturing and other third party costs

                                                                          195,099                221,479
Personnel, overhead and other costs(3)                                                     147,200                141,719
Stock-based compensation and depreciation                                                   66,379                 71,368
Research and development expense                                                     $     408,678              $ 434,566

_______________________________________________________________


(1)Clinical Study Status definitions are provided in the chart found in Part I,
Item 1. Business.
(2)Development expenses for bempegaldesleukin include expenses under the BMS
Collaboration Agreement, other collaboration agreements and our own independent
studies. The amounts for the years ended December 31, 2020 and 2019 include net
reductions of $90.4 million and $70.5 million, respectively, of development cost
reimbursements from BMS under our collaboration, net of our share of BMS' costs.
(3)The amounts for the year ended December 31, 2020 and 2019 include reductions
of $37.8 million and $34.9 million of employee cost reimbursements from BMS
under our collaboration.
  We expect research and development expense to increase for 2021 compared to
2020 primarily as a result of our continued development of bempegaldesleukin,
including studies outside of the BMS Collaboration Agreement. In addition, we
are collaborating with Lilly to develop NKTR-358, and Lilly will be conducting
the recently started Phase 2 studies and other ongoing studies in 2021, for
which we are responsible for 25% of costs. We are continuing to enroll patients
in the expansion cohorts of the Phase 1/2 study for NKTR-262 in combination with
bempegaldesleukin. We will continue our Phase 1/2 dose-escalation and expansion
studies for NKTR-255 in multiple myeloma, non-Hodgkin lymphoma, relapsed or
refractory head and neck squamous cell carcinoma, and colorectal cancer. The
timing and amount of our future clinical investments will vary significantly
based upon our evaluation of ongoing clinical results and the structure, timing,
and scope of additional clinical development programs and potential clinical
collaboration partnerships (if any) for these programs.
  In addition to our drug candidates that we plan to evaluate in clinical
development during 2021 and beyond, we believe it is vitally important to
continue our substantial investment in a pipeline of new drug candidates to
continue to build the value of our drug candidate pipeline and our business. Our
discovery research organization is identifying new drug candidates by applying
our polymer conjugate technology platform to a wide range of molecule classes,
including small molecules and large proteins, peptides and antibodies, across
multiple therapeutic areas. We also plan from time to time to evaluate
opportunities to in-license potential drug candidates from third parties to add
to our drug discovery and development pipeline. We plan to continue to advance
our most promising early research drug candidates into preclinical development
with the objective to advance these early stage research programs to human
clinical studies over the next several years.
  Our expenditures on current and future preclinical and clinical development
programs are subject to numerous uncertainties in timing and cost to completion.
In order to advance our drug candidates through clinical development, each drug
candidate must be tested in numerous preclinical safety, toxicology and efficacy
studies. We then conduct clinical studies for our drug candidates that take
several years to complete. The cost and time required to complete clinical
trials may vary significantly over the life of a clinical development program as
a result of a variety of factors, including but not limited to:
•the number of patients required for a given clinical study design;
•the length of time required to enroll clinical study participants;
•the number and location of sites included in the clinical studies;
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•the clinical study designs required by the health authorities (i.e. primary and
secondary endpoints as well as the size of the study population needed to
demonstrate efficacy and safety outcomes);
•the potential for changing standards of care for the target patient population;
•the competition for patient recruitment from competitive drug candidates being
studied in the same clinical setting;
•the costs of producing supplies of the drug candidates needed for clinical
trials and regulatory submissions;
•the safety and efficacy profile of the drug candidate;
•the use of clinical research organizations to assist with the management of the
trials; and
•the costs and timing of, and the ability to secure, approvals from government
health authorities.
  Furthermore, our strategy includes the potential of entering into
collaborations with third parties to participate in the development and
commercialization of some of our drug candidates such as those collaborations
that we have already completed for bempegaldesleukin, NKTR-358, or clinical
collaborations where we would share costs and operational responsibility with a
partner. In certain situations, the clinical development program and process for
a drug candidate and the estimated completion date will largely be under the
control of that third party and not under our control. We cannot forecast with
any degree of certainty which of our drug candidates will be subject to future
collaborations or how such arrangements would affect our development plans or
capital requirements.
As noted above, the evolving situation around the COVID-19 pandemic has had
varying impacts on the clinical testing of our proprietary drug candidates
depending on the therapeutic indication, geographic distribution of clinical
trial sites, the clinical trial stage, and, in certain cases, our partners'
general corporate approach to the pandemic. We have experienced delays of
approximately three months for some Nektar-run, earlier-stage clinical studies
(such as the Phase 1/2 trial studying bempegaldesleukin and Keytruda® in NSCLC
and the Phase 1 dose escalation trial studying NKTR-255 in patients with
relapsed/refractory hematologic malignancies) and given the evolving situation
around the COVID-19 pandemic it is possible there could be additional delays in
the future. In addition, for certain clinical studies involving our proprietary
drug candidates that are run by our partners, study timelines have been delayed
at least three to six months, and, given the evolving situation around the
COVID-19 pandemic, it is possible there could be additional delays in the
future. As a result of these delays and potential delays, we may incur
additional costs associated with these clinical trials. At this time, we cannot
estimate if such increases would have a material effect on our results of
operations or financial position.
The risks and uncertainties associated with our research and development
projects are discussed more fully in Item 1A. Risk Factors. As a result of the
uncertainties discussed above, we are unable to determine with any degree of
certainty the duration and completion costs of our research and development
projects, anticipated completion dates or when and to what extent we will
receive cash inflows from a collaboration arrangement or the commercialization
of a drug candidate.
General and administrative expense (in thousands, except percentages)

                                                                                                                          Percentage
                                                              Year Ended December 31,              Increase/              Increase/
                                                                                                   (Decrease)             (Decrease)
                                                                                                    2020 vs.               2020 vs.
                                                           2020                   2019                2019                   2019
General and administrative expense                 $     104,682               $ 98,712          $     5,970                        6  %


  General and administrative expense includes the cost of administrative
staffing, business development, marketing, finance, and legal activities.
General and administrative expense increased for the year ended December 31,
2020 compared with the year ended December 31, 2019 primarily due to increased
personnel costs as we begin a stage appropriate build of our commercial
capability to co-commercialize bempegaldesleukin with BMS. We expect general and
administrative expense to increase for 2021 compared to 2020, as we continue to
build our commercial capabilities.
Impairment of Assets and Other Costs for Terminated Program
On January 14, 2020, the joint FDA Anesthetic Drug Products Advisory Committee
and Drug Safety and Risk Management Committee did not recommend approval of our
NDA for NKTR-181. As a result, we withdrew our NDA and decided to make no
further investments in this program. On February 26, 2020, the Audit Committee
of our Board of Directors approved management's plan for the wind-down of the
NKTR-181 program.
As a result, in the three months ended March 31, 2020, we wrote off $19.7
million of advance payments to contract manufacturers for commercial batches of
NKTR-181. We also incurred $25.5 million of additional costs, primarily for
non-cancellable commitments to our contract manufacturers and severance costs.
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Interest expense (in thousands, except percentages)
                                                              Increase/       Percentage Increase/
                             Year Ended December 31,          (Decrease)           (Decrease)
                                                               2020 vs.             2020 vs.
                              2020                2019           2019                 2019
Interest expense     $      6,851              $ 21,310      $  (14,459)                     (68) %


  Interest expense decreased for the year ended December 31, 2020 as compared to
the year ended December 31, 2019. In October 2015, we issued $250.0 million in
aggregate principal amount of 7.75% senior secured notes due October 2020.
Interest on the 7.75% senior secured notes was calculated based on actual days
outstanding over a 360 day year. On April 13, 2020, we redeemed the senior
secured notes at par and therefore repaid the principal of $250.0 million and
accrued interest of $4.8 million. After the repayment, we incurred no interest
expense.
Non-Cash Royalty Revenue and Non-Cash Interest Expense (in thousands, except
percentages)
                                                                                          Increase/          Percentage Increase/
                                                                                          (Decrease)              (Decrease)
                                                                                           2020 vs.                2020 vs.
                                                   Year Ended December 31,                   2019                    2019
                                                 2020                    2019
2012 Purchase and Sale Agreement:
Non-cash royalty revenue related to sale of
future royalties                            $    37,938               $ 36,303          $     1,635                           5  %
Non-cash interest expense on liability
related to sale of future royalties         $    30,267               $ 25,044          $     5,223                          21  %
Interest rates - end of period presented
Implicit interest rate over the life of the
agreement                                          20.2   %               19.5  %
Prospective effective interest rate                48.0   %               38.0  %
2020 Purchase and Sale Agreement:
Non-cash royalty revenue related to sale of
future royalties                            $    10,625               $      -          $    10,625                          >100%
Non-cash interest expense on liability
related to sale of future royalties         $         -               $      -          $         -                           -
Interest rates - end of period presented
Implicit interest rate over the life of the
agreement                                          16.0   %               

N/A


Prospective effective interest rate                16.0   %               

N/A


Total non-cash royalty revenue related to
sale of future royalties                    $    48,563               $ 36,303          $    12,260                          34  %
Total non-cash interest expense on
liability related to sale of future
royalties                                   $    30,267               $ 25,044          $     5,223                          21  %


  As discussed in Note 7 to our Consolidated Financial Statements, we continue
to recognize non-cash royalty revenue for the 2012 Purchase and Sale Agreement
and the 2020 Purchase and Sale Agreement (as defined in Note 7).
2012 Purchase and Sale Agreement
Non-cash royalty revenue for the 2012 Purchase and Sale Agreement increased for
the year ended December 31, 2020 as compared to the year ended December 31, 2019
due to increases in net sales of CIMZIA® and MIRCERA®. Non-cash interest expense
for the 2012 Purchase and Sales Agreement increased for the year ended
December 31, 2020 compared to the year ended December 31, 2019 due to an
increase in the estimated implicit interest rate over the life of the
transaction, as disclosed above. When forecasted future revenues rise, this
results in an increase to the estimated implicit interest rate over the life of
the transaction, which, in turn, increases the prospective effective interest
rate in the current and future periods. The increase in the estimated implicit
rate from the year-ended December 31, 2019 to the year ended December 31, 2020
resulted from an increase in estimate future net sales of CIMZIA®.
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Over the term of this arrangement, the net proceeds of the transaction of $114.0
million, consisting of the original proceeds of $124.0 million, net of $10.0
million in payments from us to RPI, is amortized as the difference between the
non-cash royalty revenue and the non-cash interest expense. To date, we have
amortized $48.1 million of the net proceeds. We periodically assess future
non-cash royalty revenues, and we may adjust the prospective effective interest
rate based on our best estimates of future non-cash royalty revenue such that
future non-cash interest expense will amortize the remaining $65.9 million of
the net proceeds, since RPI (as defined in Note 7) receives all of the benefits
of the increases in future royalties. There are a number of factors that could
materially affect our estimated interest rate, in particular, the amount and
timing of royalty payments from future net sales of CIMZIA® and MIRCERA®. As a
result, future interest rates could differ significantly, and we will adjust any
such change in our estimated interest rate prospectively.
2020 Purchase and Sale Agreement
As discussed in Note 7 to the Consolidated Finance Statements and above under
Royalty Revenue, we began recognizing non-cash royalty revenue for the 2020
Purchase and Sale Agreement in the three months ended December 31, 2020 and did
not recognize any non-cash interest expense due to an immaterial amount of time
to impute interest from closing to December 31, 2020. Non-cash royalty revenue
and non-cash interest expense will increase for 2021 as we will recognize them
for the full year. Our estimate of the imputed interest rate reflects our
estimates for sales of MOVANTIK®, ADYNOVATE® and REBINYN®, which result in
meeting the 2025 Threshold (as defined in Note 7). Because the 2025 Threshold of
$210.0 million and the increase in the threshold to $240.0 million (if the 2025
Threshold is not achieved) limit the amount of royalties payable to HCR, the
potential for the implicit interest rate to vary is more limited. Instead, we
will receive the benefit of net sales if they exceed the threshold, but do not
bear risk of loss or payments to HCR if royalties are less than expected.
Interest Income and Other Income (Expense), net (in thousands, except
percentages)
                                                                                                              Percentage
                                                                                        Increase/              Increase/
                                                                                       (Decrease)             (Decrease)
                                                                                        2020 vs.               2020 vs.
                                                  Year Ended December 31,                 2019                   2019
                                                   2020                2019
Interest income and other income (expense),
net                                          $      18,282          $ 46,335          $  (28,053)                      (61) %


Interest income and other income (expense), net decreased for the year ended
December 31, 2020 compared to the year ended December 31, 2019, primarily due to
decreases in market interest rates and lower investment balances which have been
utilized to fund our operations and the repayment of our senior notes on April
13, 2020. The effective interest rate earned on investments which we purchased
after the COVID-19 pandemic began has been significantly lower than historical
interest rates, and we expect this trend to continue. We expect that our
interest income and other income (expense), net will decrease for 2021 compared
to 2020 due to continued lower interest rates and lower investments balances as
we fund our operations.
Income Tax Expense (in thousands, except percentages)
                                                                                                             Percentage
                                                                                      Increase/               Increase/
                                                                                      (Decrease)             (Decrease)
                                                                                       2020 vs.               2020 vs.
                                                Year Ended December 31,                  2019                   2019
                                                 2020                2019
Provision for income taxes                 $         493          $    613          $      (120)                      (20) %

For the years ended December 31, 2020 and 2019, our income tax expense primarily results from taxable income in our Nektar India subsidiary.

Due to our expected net loss in 2021, we expect income tax expense to be consistent with 2020 and reflect taxable income for our Nektar India operations. Liquidity and Capital Resources


  We have financed our operations primarily through revenue from upfront and
milestone payments under our strategic collaboration agreements, royalties and
product sales, as well as public offering and private placements of debt and
equity securities. At December 31, 2020, we had approximately $1.2 billion in
cash and investments in marketable securities. As noted above, on April 13,
2020, we repaid the principal and accrued interest of our senior notes totaling
$254.8 million.
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  We estimate that we have working capital to fund our current business plans
for at least the next twelve months from the date of filing. We expect the
clinical development of our proprietary drug candidates including
bempegaldesleukin, NKTR-358, NKTR-262 and NKTR-255 will continue to require
significant investment to continue to advance in clinical development with the
objective of obtaining regulatory approval or entering into one or more
collaboration partnerships. In the past, we have received a number of
significant payments from collaboration agreements and other significant
transactions. In April 2018, we received a total of $1.85 billion from BMS
including a $1.0 billion upfront payment and an $850.0 million premium
investment in our common stock. In July 2017, we entered into a collaboration
agreement for NKTR-358 with Lilly, under which we received a $150.0 million
upfront payment. In the future, we expect to receive substantial payments from
our collaboration agreements with BMS and Lilly. In particular, under the BMS
Collaboration Agreement, we are entitled to approximately $1.455 billion of
clinical, regulatory and commercial launch milestones (of which, we have
received $50.0 million). Of the remaining milestones, $625.0 million are
associated with approval and launch of bempegaldesleukin in its first indication
in the U.S., EU and Japan (which reflects the reduction for the $25.0 million
nonrefundable, creditable milestone for the first patient, first visit in the
muscle-invasive bladder cancer trial that BMS paid to us in March 2020). As a
result, whether and when bempegaldesleukin is approved in any indication will
have a significant impact on our future liquidity and capital resources. We have
no credit facility or any other sources of committed capital.
On February 12, 2021, we entered into a co-development agreement with SFJ
Pharmaceuticals (SFJ), pursuant to which SFJ will pay up to $150.0 million in
committed funding to support a Phase 2/3 study of bempegaldesleukin in
combination with pembrolizumab (Keytruda®) for first-line treatment of patients
with metastatic or unresectable recurrent squamous cell carcinoma of the head
and neck (the SCCHN Clinical Trial) whose tumors express PD-L1 (the SCCHN
Indication). In exchange for funding the SCCHN Clinical Trial, SFJ is entitled
to a series of contingent success-based payments with the first payment due
after substantial completion of the SCCHN Clinical Trial which we currently
expect to occur in late 2024 or early 2025 as follows: (i) if bempegaldesleukin
receives FDA approval for first line metastatic melanoma or the SCCHN
Indication, we would pay SFJ $450.0 million over a series of five annual
payments with the first annual payment being $30.0 million; (ii) if
bempegaldesleukin receives FDA approval in both first line metastatic melanoma
and the SCCHN indication, we would pay SFJ an additional $150.0 million paid
over a series of seven annual payments; and (iii) if bempegaldesleukin receives
FDA approval in an indication other than first line metastatic melanoma or the
SCCHN indication, a one-time payment of $37.5 million. See Note 14 to our
Consolidated Financial Statements for additional information.
In the short term, we do not anticipate that the effects of the COVID-19
pandemic will have a material effect on our results of operations or financial
position since we do not generate significant cash flows from recurring revenues
and our revenues are generally less affected by shelter-in place or similar
orders. However, if delays caused by the COVID-19 pandemic in commencing and
enrolling patients in our clinical trials or those run by our partners result in
a delay in completing these trials, our ability to file for regulatory approval
and commercialize these products (if approved) and receive associated milestone
payments may also be delayed.
  Due to the potential for adverse developments in the credit markets, we may
experience reduced liquidity with respect to some of our investments in
marketable securities. These investments are generally held to maturity, which,
in accordance with our investment policy, is less than two years. However, if
the need arises to liquidate such securities before maturity, we may experience
losses on liquidation. To date we have not experienced any liquidity issues with
respect to these securities. We believe that, even allowing for potential
liquidity issues with respect to these securities and the effect of the COVID-19
pandemic on the financial markets, our remaining cash and investments in
marketable securities will be sufficient to meet our anticipated cash needs for
at least the next twelve months.
  Our current business plan is subject to significant uncertainties and risks as
a result of, among other factors, clinical and regulatory outcomes for
bempegaldesleukin, the sales levels of our products, if and when they are
approved, the sales levels for those products for which we are entitled to
royalties, clinical program outcomes, whether, when and on what terms we are
able to enter into new collaboration transactions, expenses being higher than
anticipated, unplanned expenses, cash receipts being lower than anticipated, and
the need to satisfy contingent liabilities, including litigation matters and
indemnification obligations.
  The availability and terms of various financing alternatives, if required in
the future, substantially depend on many factors including the success or
failure of drug development programs in our pipeline. The availability and terms
of financing alternatives and any future significant payments from existing or
new collaborations depend on the positive outcome of ongoing or planned clinical
studies, whether we or our partners are successful in obtaining regulatory
authority approvals in major markets, and if approved, the commercial success of
these drugs, as well as general capital market conditions. We may pursue various
financing alternatives to fund the expansion of our business as appropriate.
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Our only significant noncancellable contractual commitments relate to our
leases. Please see Note 6 to our Consolidated Financial Statements for
additional information.
Cash flows from operating activities
  Cash flows used in operating activities for the year ended December 31, 2020
totaled $313.3 million, which includes $353.6 million of net operating cash uses
and $9.7 million for interest payments on our senior secured notes, partially
offset by a $50.0 million in milestones under the BMS Collaboration Agreement.
  Cash flows used in operating activities for the year ended December 31, 2019
totaled $328.7 million, which includes $319.5 million of net operating cash uses
and $19.2 million for interest payments on our senior secured notes, partially
offset by $10.0 million from our collaboration agreement with Baxalta.
  We expect that cash flows used in operating activities, excluding upfront,
milestone and other contingent payments received, if any, will increase in 2021
compared to 2020 primarily as a result of increased research and development
expenses and no offsetting collaboration milestone payments.
Cash flows from investing activities
  We paid $7.3 million and $26.3 million to purchase or construct property,
plant and equipment in the years ended December 31, 2020 and 2019, respectively.
The significant decrease in capital expenditures from 2019 was primarily due to
the construction of leasehold improvements in 2019 at our Third Street facility
as more fully described in Note 6 of our Consolidated Financial Statements.
Cash flows from financing activities
  As described in Note 5 to our Consolidated Financial Statements, in the second
quarter of 2020, we redeemed the senior secured notes at par and therefore
repaid the principal of $250.0 million and accrued interest of $4.8 million.
As described in Note 7 to our Consolidated Financial Statements and as described
above, on December 16, 2020, we entered into a purchase and sale agreement (the
2020 Purchase and Sale Agreement) with entities managed by Healthcare Royalty
Management, LLC, pursuant to which we sold our rights to receive royalty
payments arising from the worldwide net sales of MOVANTIK®, ADYNOVATE® and
REBINYN®, beginning on October 1, 2020. We received proceeds of $146.3 million,
representing the sale of price $150.0 million, net of transaction costs. See
Note 7 for additional details on the 2020 Purchase and Sale Agreement, including
the capped nature of the arrangement.
  We received proceeds from issuance of common stock related to our employee
option and stock purchase plans of $23.4 million and $23.4 million in the years
ended December 31, 2020 and 2019, respectively.
Critical Accounting Policies
  The preparation and presentation of financial statements in conformity with
U.S. generally accepted accounting principles (GAAP) requires management to make
estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the financial statements and the reported amounts of revenues and expenses
during the reporting period.
  We base our estimates on historical experience and on various other
assumptions that we believe to be reasonable under the circumstances, the
results of which form our basis for making judgments about the carrying value of
assets and liabilities that are not readily apparent from other sources and
evaluate our estimates on an ongoing basis. Actual results may differ materially
from those estimates under different assumptions or conditions. We have
determined that for the periods in this report, the following accounting
policies and estimates are critical in understanding our financial condition and
the results of our operations.
Collaborative Arrangements
  When we enter into collaboration agreements with pharmaceutical and
biotechnology partners, we assess whether the arrangements fall within the scope
of Accounting Standards Codification (ASC) 808, Collaborative Arrangements (ASC
808) based on whether the arrangements involve joint operating activities and
whether both parties have active participation in the arrangement and are
exposed to significant risks and rewards. To the extent that the arrangement
falls within the scope of ASC 808, we assess whether the payments between us and
our collaboration partner fall within the scope of other accounting
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literature. If we conclude that payments from the collaboration partner to us
represent consideration from a customer, such as license fees and contract
research and development activities, we account for those payments within the
scope of ASC 606, Revenue from Contracts with Customers. However, if we conclude
that our collaboration partner is not a customer for certain activities and
associated payments, such as for certain collaborative research, development,
manufacturing and commercial activities, we record such payments as a reduction
of research and development expense or general and administrative expense, based
on where we record the underlying expense.
Revenue Recognition
  We recognize license, collaboration and other research revenue based on the
facts and circumstances of each contractual agreement and includes recognition
of upfront fees and milestone payments. At the inception of each agreement, we
determine which promises represent distinct performance obligations, for which
management must use significant judgment. Additionally, at inception and at each
reporting date thereafter, we must determine and update, as appropriate, the
transaction price, which includes variable consideration such as development
milestones. We must use judgment to determine when to include variable
consideration in the transaction price such that inclusion of such variable
consideration will not result in a significant reversal of revenue recognized
when the contingency surrounding the variable consideration is resolved. We must
also allocate the arrangement consideration to performance obligations based on
their relative standalone selling prices, which we generally base on our best
estimates and which require significant judgment. For example, in estimating the
standalone selling prices for granting licenses for our drug candidates, our
estimates may include revenue forecasts, clinical development timelines and
costs, discount rates and probabilities of clinical and regulatory success. For
performance obligations satisfied over time, we recognize revenue based on our
estimates of expected future costs or other measures of progress.
Accrued Clinical Trial Expenses
  We record an accrued expense for the estimated unbilled costs of our clinical
study activities performed by third parties. The financial terms of these
agreements are subject to negotiation, vary from contract to contract and may
result in uneven payment flows to our vendors. Payments under the contracts
depend on factors such as the achievement of certain events, successful
enrollment of patients and completion of certain clinical trial activities. We
generally accrue costs associated with the start-up and reporting phases of the
clinical trials ratably over the estimated duration of the start-up and
reporting phases. We generally accrue costs associated with the treatment phase
of clinical trials based on the estimated activities performed by our third
parties. We may also accrue expenses based on the total estimated cost of the
treatment phase on a per patient basis and expense the per patient cost ratably
over the estimated patient treatment period based on patient enrollment in the
trials. In specific circumstances, such as for certain time-based costs, we
recognize clinical trial expenses using a methodology that we consider to be
more reflective of the timing of costs incurred.
  Advance payments for goods or services that will be used or rendered for
future research and development activities are capitalized as prepaid expenses
and recognized as expense as the related goods are delivered or the related
services are performed. We base our estimates on the best information available
at the time. However, additional information may become available to us which
may allow us to make a more accurate estimate in future periods. In this event,
we may be required to record adjustments to research and development expenses in
future periods when the actual level of activity becomes more certain. Such
increases or decreases in cost are generally considered to be changes in
estimates and will be reflected in research and development expenses in the
period identified.
Accrued Contract Manufacturing Expenses
  We record accruals for the estimated unbilled costs of our contract
manufacturing activities performed by third parties. The financial terms of
these agreements are subject to negotiation, vary from contract to contract and
may result in uneven payment flows to our vendors. Payments under the contracts
include upfront payments and milestone payments, which depend on factors such as
the achievement of the completion of certain stages of the manufacturing
process. For purposes of recognizing expense, we assess whether we consider the
production process sufficiently defined to be considered the delivery of a good,
as evidenced by predictive or contractually required yields, or the delivery of
a service, where processes and yields are developing and less certain. If we
consider the process to be the delivery of a good, we recognize expense when the
drug product is delivered, or we otherwise bear risk of loss. If we consider the
process to be the delivery of a service, we recognize expense based on our best
estimates of the contract manufacturer's progress towards completion of the
stages in the contract. We base our estimates on the best information available
at the time. However, additional information may become available to us which
may allow us to make a more accurate estimate in future periods. In this event,
we may be required to record adjustments to research and development expenses in
future periods when the actual level of activity becomes more certain. In
certain circumstances, we may be entitled to reductions of amounts due under
these arrangements if delivery is delayed or the yield from the production
process is lower than expected. Given the uncertainties with such reductions, we
may only recognize
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such decrease when the contract manufacturer agrees with such reduction. Such
increases or decreases in cost are generally considered to be changes in
estimates and will be reflected in research and development expenses in the
period identified.
Item 7A. Quantitative and Qualitative Disclosures About Market Risk
Interest Rate and Market Risk
  The primary objective of our investment activities is to preserve principal
while at the same time maximizing yields without significantly increasing risk.
To achieve this objective, we invest in liquid, high quality debt securities.
Our investments in debt securities are subject to interest rate risk. To
minimize the exposure due to an adverse shift in interest rates, we invest in
securities with maturities of two years or less and maintain a weighted average
maturity of one year or less.
  A hypothetical 50 basis point increase in interest rates would result in an
approximate $2.5 million decrease, less than 1%, in the fair value of our
available-for-sale securities at December 31, 2020. This potential change is
based on sensitivity analyses performed on our investment securities at
December 31, 2020. Actual results may differ materially. The same hypothetical
50 basis point increase in interest rates would have resulted in an approximate
$4.3 million decrease, less than 1%, in the fair value of our available-for-sale
securities at December 31, 2019.
  As of December 31, 2020, we held $1.0 billion of available-for-sale
investments, excluding money market funds, with an average time to maturity of
five months. To date we have not experienced any liquidity issues with respect
to these securities, but should such issues arise, we may be required to hold
some, or all, of these securities until maturity. We believe that, even allowing
for potential liquidity issues with respect to these securities, our remaining
cash, cash equivalents, and investments in marketable securities will be
sufficient to meet our anticipated cash needs for at least the next twelve
months. Based on our available cash and our expected operating cash
requirements, we currently do not intend to sell these securities prior to
maturity and it is more likely than not that we will not be required to sell
these securities before we recover the amortized cost basis. Accordingly, we
believe there are no other-than-temporary impairments on these securities and
have not recorded any provisions for impairment.
Foreign Currency Risk
  The majority of our revenue, expense, and capital purchasing activities are
transacted in U.S. dollars. However, we have contracts with contract
manufacturing organizations in Europe, transacted in the British pound sterling
or Euros, and incur costs from sites in a variety of international locations
which are compensated in their respective local currencies. Additionally, a
portion of our operations consists of research and development activities
outside the United States, with transactions in the Indian Rupee. Accordingly,
we are subject to foreign currency exchange risk for these transactions.
  Our international operations are subject to risks typical of international
operations, including, but not limited to, differing economic conditions,
changes in political climate, differing tax structures, other regulations and
restrictions, and foreign exchange rate volatility. We do not utilize derivative
financial instruments to manage our exchange rate risks. We do not believe that
inflation has had a material adverse impact on our revenues or operations in any
of the past three years.
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