You should read the following discussion and analysis of our financial condition
and results of operations together with our consolidated financial statements
and related notes and other financial information appearing in this Annual
Report. Some of the information contained in this discussion and analysis or set
forth elsewhere in this Annual Report, including information with respect to our
plans and strategy for our business, operations, and product candidates,
includes forward-looking statements that involve risks and uncertainties. You
should review the sections of this Annual Report on Form 10-K captioned "Risk
Factors" and "Cautionary Note Regarding Forward-Looking Statements" for a
discussion of important factors that could cause our actual results to differ
materially from the results described in or implied by the forward-looking
statements contained in the following discussion and analysis.

Overview



We are a clinical-stage biopharmaceutical company focused on identifying,
developing, and commercializing innovative therapies that change patients' lives
for the better. We concentrate on small-molecule therapeutics with novel
mechanisms of action for the treatment of severe, life-threatening diseases with
few or no approved therapies. Our lead programs are in rare forms of CKD and a
rare neurological disease. We recently announced positive topline data from
registrational studies for both of our lead product candidates, bardoxolone in
patients with CKD caused by Alport syndrome, and omaveloxolone in patients with
a neurological disorder called FA. Both bardoxolone and omaveloxolone activate
the transcription factor Nrf2 to normalize mitochondrial function, restore redox
balance, and resolve inflammation. Because mitochondrial dysfunction, oxidative
stress, and inflammation are features of many diseases, we believe bardoxolone
and omaveloxolone have many potential clinical applications. We possess
exclusive, worldwide rights to develop, manufacture and commercialize
bardoxolone, omaveloxolone, and our next-generation Nrf2 activators, excluding
certain Asian markets for bardoxolone in certain indications which are licensed
to KKC.

Programs in Chronic Kidney Disease

We are developing bardoxolone for the treatment of patients with CKD caused by Alport syndrome, ADPKD, and other rare forms of CKD that, in the aggregate, affect more than 700,000 patients in the United States.



Alport syndrome is a rare, genetic form of CKD caused by mutations in the genes
encoding type IV collagen, which is a major structural component of the GBM in
the kidney. Alport syndrome patients experience a progressive worsening of the
kidney's capacity to filter waste products out of the blood that can lead to
ESKD and the need for chronic dialysis treatment or a kidney transplant. Alport
syndrome affects both children and adults and, in patients with the most severe
forms of the disease, approximately 50% progress to dialysis by age 25, 90% by
age 40, and nearly 100% by age 60.  According to the Alport Syndrome Foundation,
Alport syndrome affects approximately 30,000 to 60,000 people in the United
States. There are currently no approved therapies to treat CKD caused by Alport
syndrome.

In November 2019, we announced that the Phase 3 portion of the CARDINAL study of
bardoxolone in patients with CKD caused by Alport syndrome met its primary and
key secondary Year 1 endpoints. After 48 weeks of treatment, patients treated
with bardoxolone had a statistically significant improvement compared to placebo
in mean eGFR of 9.50 mL/min/1.73 m2 (p<0.0001). After 48 weeks of treatment and
a four-week withdrawal period, patients treated with bardoxolone had a
statistically significant improvement compared to placebo in mean retained eGFR
of 5.14 mL/min/1.73 m2 (p=0.0012). After 52 weeks, patients in the placebo arm
of CARDINAL lost an average of 6.1 mL/min/1.73 m2. Based on these positive
results, and subject to discussions with regulatory authorities, we plan to
proceed with the submission of regulatory filings this year for marketing
approval in the United States.

ADPKD is a rare and serious hereditary form of CKD caused by a genetic defect in
PKD1 or PKD2 genes leading to the formation of fluid-filled cysts in the kidneys
and other organs. Cyst growth can cause the kidneys to expand up to five to
seven times their normal volume, leading to pain and progressive loss of kidney
function. ADPKD affects both men and women of all racial and ethnic groups and
is the leading inheritable cause of kidney failure with an estimated diagnosed
population of 140,000 patients in the United States. Despite current standard of

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care treatment, an estimated 50% of ADPKD patients progress to ESKD and require dialysis or a kidney transplant by 60 years of age.



In a Phase 2 study called PHOENIX, bardoxolone demonstrated a statistically
significant increase from baseline of 9.3 mL/min/1.73 m2 in mean eGFR after 12
weeks of treatment in 31 patients with ADPKD. Available historical data for 29
of these patients showed an average annual decline in eGFR of 4.8 mL/min/1.73 m2
in the three-year period prior to study entry. In May 2019, we began enrollment
in FALCON, an international, multi-center, randomized, double-blind,
placebo-controlled Phase 3 trial studying the safety and efficacy of bardoxolone
in approximately 300 patients with ADPKD. The trial will enroll a broad range of
patients from 18 to 70 years old with an eGFR between 30 to 90 mL/min/1.73
m². The FDA has provided us with written guidance that, in patients with ADPKD,
an analysis of retained eGFR demonstrating an improvement versus placebo after
one year of bardoxolone treatment may support accelerated approval, and an
improvement versus placebo after two years of treatment may support full
approval.

Three additional rare forms of CKD were studied in PHOENIX, IgAN, T1D CKD, and
FSGS. In each of these Phase 2 cohorts, bardoxolone demonstrated a statistically
significant increase from baseline in mean eGFR after 12 weeks of treatment in
patients whose available historical data showed annual declines in eGFR in the
three-year period prior to study entry. We believe that clinical trials similar
to the design of the Phase 3 CARDINAL and FALCON trials with a two-year duration
and a retained eGFR benefit endpoint after one and two years of treatment may be
acceptable for submission of an NDA for these forms of CKD to the FDA. We plan
to pursue each of these rare and serious forms of CKD as commercial indications.

The FDA has granted orphan drug designation to bardoxolone for the treatment of
Alport syndrome and ADPKD, and the European Commission has granted orphan drug
designation to bardoxolone for the treatment of Alport syndrome.

Programs in Neurological Diseases



We are developing omaveloxolone for the treatment of patients with FA, an
inherited, debilitating, and degenerative neuromuscular disorder that is
typically diagnosed during adolescence and can ultimately lead to premature
death. Patients with FA experience progressive loss of coordination, muscle
weakness, and fatigue, which commonly progresses to motor incapacitation and
wheelchair reliance. Symptoms generally occur in children, with patients
requiring a wheelchair by their teens or early 20s. FA affects approximately
5,000 children and adults in the United States and 22,000 individuals
globally. There are currently no approved therapies to treat FA.

In October 2019, we announced that the registrational part 2 portion of the
MOXIe Phase 2 trial of omaveloxolone in patients with FA met its primary
endpoint of change in mFARS relative to placebo after 48 weeks of
treatment. Patients treated with omaveloxolone (150 mg/day) demonstrated a
statistically significant, placebo-corrected 2.40 point mean improvement
(decrease) in mFARS after 48 weeks of treatment (p=0.014). Omaveloxolone
treatment was generally reported to be well-tolerated. Based on these positive
results, and subject to discussions with regulatory authorities, we plan to
proceed with the submission of regulatory filings this year for marketing
approval of omaveloxolone for the treatment of FA in the United States. The FDA
and the European Commission have granted orphan drug designation to
omaveloxolone for the treatment of FA.

In addition, we have observed compelling activity of omaveloxolone and our other
Nrf2 activators in preclinical models of Parkinson's disease, dementia,
epilepsy, Huntington's disease, and ALS, and we plan to pursue the development
of omaveloxolone and our other Nrf2 activators for one or more of these
diseases.

We are also developing RTA 901 in neurological indications. RTA 901 is the lead
product candidate from our Hsp90 modulator program. We have observed favorable
activity of RTA 901 in a range of preclinical models of neurological disease,
including models of diabetic neuropathy, neuroinflammation, and neuropathic
pain. We have completed a Phase 1 trial to evaluate the safety, tolerability,
and pharmacokinetic profile of RTA 901 administered orally, once-daily in
healthy adult volunteers, and no safety or tolerability concerns were reported
plan. We plan to continue RTA 901 development activities in neurological
diseases such as diabetic neuropathy. We are the exclusive licensee of RTA 901
and have worldwide commercial rights.

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Other Clinical Programs



In addition to our lead programs in rare forms of CKD and a rare neurological
disease, we are exploring additional clinical and preclinical programs. Our most
advanced program outside of CKD and neurological diseases is the registrational
Phase 3 CATALYST study of bardoxolone in PAH caused by CTD-PAH. CTD-PAH is a
rare, serious, and progressive disease that leads to heart failure and
death. CTD-PAH patients are less responsive to existing vasodilator therapies
than patients with the more common, I-PAH and have a worse prognosis.

In a Phase 2 clinical trial in patients with PAH called LARIAT, bardoxolone
demonstrated a statistically significant, time-averaged increase in mean 6MWD at
16 weeks in CTD-PAH patients compared to baseline. CATALYST is an international,
multi-center, randomized, double-blind, placebo-controlled trial studying the
safety and efficacy of bardoxolone in CTD-PAH patients randomized one-to-one to
active drug or placebo. We completed the enrollment of CATALYST and expect to
have top-line data in mid-2020. Based on discussions with the FDA, the primary
endpoint of CATALYST is the change from baseline in 6MWD compared to placebo
after 24 weeks of treatment. If positive, we believe that the results of
CATALYST, together with other data from our development program, may be
sufficient to form the basis of an NDA submission to the FDA seeking approval of
bardoxolone for the treatment of CTD-PAH. The FDA has granted orphan drug
designation to bardoxolone for the treatment of PAH.

In addition, we are developing RTA 1701, the lead product candidate from our
proprietary series of ROR?t inhibitors, for the potential treatment of a broad
range of autoimmune, inflammatory, and fibrotic diseases. We have completed a
Phase 1 trial to evaluate the safety, tolerability, and pharmacokinetic profile
of RTA 1701 in healthy adult volunteers. No safety or tolerability concerns were
reported, and we observed an acceptable pharmacokinetic profile. We plan to
continue development for RTA 1701 in autoimmune, inflammatory, or fibrotic
diseases. We retain all rights to our ROR?t inhibitors, which are not subject to
any existing commercial collaborations.

Collaborations Update



In October 2019, we and AbbVie entered into the Reacquisition Agreement, under
which we reacquired the development, manufacturing, and commercialization rights
provided in the AbbVie License Agreement and the Collaboration Agreement. Under
the Reacquisition Agreement, the AbbVie License Agreement and the Collaboration
Agreement were amended, resulting in AbbVie granting its exclusive sublicenses
back to us, such that we reacquired the worldwide rights to bardoxolone,
excluding certain Asian countries previously licensed to KKC, and the worldwide
rights to omaveloxolone and certain next-generation Nrf2 activators. By
reacquiring our rights, we were relieved from our obligations under the AbbVie
License Agreement and the Collaboration Agreement.

In exchange for such rights, we agreed to pay AbbVie $330.0 million, of which
$100.0 million was paid as of December 31, 2019, $150.0 million will be payable
on June 30, 2020, and $80.0 million will be payable on November 30,
2021. Additionally, we will pay AbbVie an escalating, low single-digit royalty
on worldwide net sales, on a product-by-product basis, of omaveloxolone and
certain next-generation Nrf2 activators.

After the $330.0 million has been paid to AbbVie, the licenses granted to AbbVie
and the sublicenses granted to us with respect to omaveloxolone and certain
next-generation Nrf2 activators will terminate, with all rights reverting to us,
and, if (or when) 18 months has elapsed since the execution of the Reacquisition
Agreement, the licenses granted to AbbVie and the sublicenses granted to us with
respect to bardoxolone will also terminate, with all rights reverting to us.

Corporate Overview



To date, we have focused most of our efforts and resources on developing our
product candidates and conducting preclinical studies and clinical trials. We
have historically financed our operations primarily through revenue generated
from our collaborations with AbbVie and KKC, from sales of our securities, and
with secured loans. We have not received any payments or revenue from
collaborations other than nonrefundable upfront, milestone, and cost sharing
payments from our collaborations with AbbVie and KKC and reimbursements of
expenses under the terms of our agreement with KKC. We have incurred losses in
each year since our inception, other than in 2014. As of December 31, 2019, we
had $664.3 million of cash and cash equivalents and an

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accumulated deficit of $710.5 million. We continue to incur significant research
and development and other expenses related to our ongoing operations. Despite
contractual product development commitments and the potential to receive future
payments from KKC, we anticipate that we will continue to incur losses for the
foreseeable future, and we anticipate that our losses will increase as we
continue our development of, seek regulatory approval for, and potential
commercialization of our product candidates. If we do not successfully develop
and obtain regulatory approval of our existing product candidates or any future
product candidates and effectively manufacture, market, and sell any products
that are approved, we may never generate revenue from product
sales. Furthermore, even if we do generate revenue from product sales, we may
never again achieve or sustain profitability on a quarterly or annual basis. Our
prior losses, combined with expected future losses, have had and will continue
to have an adverse effect on our stockholders' equity and working capital. Our
failure to become and remain profitable could depress the market price of our
Class A common stock and could impair our ability to raise capital, expand our
business, diversify our product offerings, or continue our operations.

In November 2019, we closed a follow-on underwritten public offering of
2,760,000 shares of our Class A common stock for gross proceeds of $505.1
million. We received net proceeds from the offering of $491.9 million, after
deducting underwriting discounts and commissions and offering expenses. We
intend to use the net proceeds for working capital and general corporate
purposes, which include, but are not limited to, advancing the development of
bardoxolone and omaveloxolone through clinical trials, preparing to file one or
more NDAs, and planning for commercialization of our potential products.

The probability of success for each of our product candidates and clinical
programs and our ability to generate product revenue and become profitable
depend upon a variety of factors, including the quality of the product
candidate, clinical results, investment in the program, competition,
manufacturing capability, commercial viability, and our collaborators' ability
to successfully execute our development and commercialization plans. We will
also require additional capital through equity, debt, or royalty financings or
collaboration arrangements in order to fund our operations and execute on our
business plans, and there is no assurance that such financing or arrangements
will be available to us on commercially reasonable terms or at all. For a
description of the numerous risks and uncertainties associated with product
development and raising additional capital, see "Risk Factors" included in this
Annual Report.

Financial Operations Overview

Revenue

Our revenue to date has been generated primarily from licensing fees received
under our collaborative license agreements and reimbursements for expenses. We
currently have no approved products and have not generated any revenue from the
sale of products to date. In the future, we may generate revenue from product
sales, royalties on product sales, reimbursements for collaboration services
under our current collaboration agreements, or license fees, milestones, or
other upfront payments if we enter into any new collaborations or license
agreements. We expect that our future revenue will fluctuate from quarter to
quarter for many reasons, including the uncertain timing and amount of any such
payments and sales.

Our license and milestone revenue have been generated primarily from the KKC
Agreement, the AbbVie License Agreement, and the Collaboration Agreement and
consists of upfront payments and milestone payments. License revenue recorded
with respect to the KKC Agreement, the AbbVie License Agreement, and the
Collaboration Agreement consists solely of the recognition of deferred
revenue. Under our revenue recognition policy, collaboration revenue associated
with upfront, non-refundable license payments received under our license and
collaboration agreements are deferred and recognized ratably over the expected
term of the performance obligations under each agreement. Under the
Reacquisition Agreement, we no longer have performance obligations under the
AbbVie License Agreement and the Collaboration Agreement, and the related
remaining deferred revenue balance of $191.1 million under the Collaboration
Agreement was expensed as reacquired license rights in the fourth quarter of
2019. As the AbbVie License Agreement was fully recognized in 2017, we only
expect to recognize revenue under the KKC Agreement, which extends through 2021.

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Research and Development Expenses



The largest component of our total operating expenses has historically been our
investment in research and development activities, including the clinical
development of our product candidates. From our inception through December 31,
2019, we have incurred a total of $774.9 million in research and development
expense, a majority of which relates to the development of bardoxolone and
omaveloxolone. We expect our research and development expense to continue to
increase in the future as we advance our product candidates through clinical
trials and expand our product candidate portfolio. The process of conducting the
necessary clinical research to obtain regulatory approval is costly and
time-consuming, and we consider the active management and development of our
clinical pipeline to be crucial to our long-term success. The actual probability
of success for each product candidate and preclinical program may be affected by
a variety of factors, including the safety and efficacy data for product
candidates, investment in the program, competition, manufacturing capability,
and commercial viability.

Research and development expenses include:

• expenses incurred under agreements with clinical trial sites that


          conduct research and development activities on our behalf;


     •    expenses incurred under contract research agreements and other
          agreements with third parties;

• employee and consultant-related expenses, which include salaries,

benefits, travel, and stock-based compensation;

• laboratory and vendor expenses related to the execution of preclinical

and non-clinical studies and clinical trials;

• the cost of acquiring, developing, manufacturing, and distributing

clinical trial materials;

• the cost of development, scale up, and process validation activities to

support product registration; and

• facilities, depreciation, and other expenses, which include direct and

allocated expenses for rent and maintenance of facilities, insurance,

and other supply costs.




Research and development costs are expensed as incurred. Costs for certain
development activities such as clinical trials are highly judgmental and are
recognized based on an evaluation of the progress to completion of specific
tasks using information and data provided to us by our vendors and our clinical
sites.

We base our expense accruals related to clinical trials on our estimates of the
services received and efforts expended pursuant to contracts with multiple
research institutions and CROs that conduct and manage clinical trials on our
behalf. The financial terms of these agreements vary from contract to contract
and may result in uneven payment flows. Payments under some of these contracts
depend on factors such as the successful enrollment of patients and the
completion of clinical trial milestones. In accruing costs, we estimate the time
period over which services will be performed and the level of effort to be
expended in each period. If we do not identify costs that we have begun to incur
or if we underestimate or overestimate the level of services performed or the
costs of these services, our actual expenses could differ from our estimates.

To date, we have not experienced material changes in our estimates of accrued
research and development expenses after a reporting period. However, due to the
nature of estimates, we cannot assure you that we will not make changes to our
estimates in the future as we become aware of additional information about the
status or conduct of our clinical trials and other research activities.

Currently, KKC has allowed us to conduct clinical studies of bardoxolone in
CTD-PAH and certain rare forms of kidney diseases in Japan and has reimbursed us
the majority of the costs for our CARDINAL study in Japan and is paying for the
costs of a certain number of patients as the in-country caretaker in our FALCON
study in Japan. We reduced our expenses by $0.5 million, $2.0 million and $0.5
million for KKC's share of the study costs for the year ended December 31, 2019,
2018 and 2017, respectively.

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The following table summarizes our research and development expenses incurred during the years ended December 31:





                                            2019          2018         2017
                                                    (in thousands)
Bardoxolone methyl                        $  47,994     $ 43,566     $ 35,999
Omaveloxolone                                23,992       19,277       10,123
RTA 901                                       1,859          350        1,927
RTA 1701                                      1,505        2,263        2,942

Other research and development expenses 52,759 31,832 20,282 Total research and development expenses $ 128,109 $ 97,288 $ 71,273






The program-specific expenses summarized in the table above include costs that
we directly allocate to our product candidates. Our other research and
development expenses include research and development salaries, benefits,
stock-based compensation and preclinical, research, and discovery costs, which
we do not allocate on a program-specific basis.

Acquired License Rights



All acquired license costs that are in-process research and development (the
"IPR&D"), which are acquired directly in a transaction other than a business
combination and which do not have an alternative future use, are expensed as
incurred.

In October 2019, we and AbbVie entered into the Reacquisition Agreement, under
which we reacquired the development, manufacturing, and commercialization rights
provided in the AbbVie License Agreement and the Collaboration Agreement. Under
the Reacquisition Agreement, the AbbVie License Agreement and the Collaboration
Agreement were amended, resulting in AbbVie granting its exclusive sublicenses
back to us, such that we reacquired the worldwide rights to bardoxolone,
excluding certain Asian countries previously licensed to KKC, and the worldwide
rights to omaveloxolone and certain next-generation Nrf2 activators. By
reacquiring our rights, we were relieved from our obligations under the AbbVie
License Agreement and the Collaboration Agreement.

General and Administrative Expenses



General and administrative expenses consist primarily of employee-related
expenses for executive, operational, finance, legal, compliance, and human
resource functions. Other general and administrative expenses include personnel
expense, facility-related costs, professional fees, accounting and legal
services, depreciation expense, other external services, and expenses associated
with obtaining and maintaining our intellectual property rights.

We anticipate that our general and administrative expenses will increase in the
future as we increase our headcount to support our continued research and
development and potential commercialization of our product candidates. We have
also incurred, and anticipate incurring in the future, increased expenses
associated with being a public company, including exchange listing and SEC
requirements, director and officer insurance premium, legal, audit and tax fees,
compliance with the Sarbanes-Oxley Act, regulatory compliance programs, and
investor relations costs. Additionally, if and when we believe the first
regulatory approval of one of our product candidates appears likely, we
anticipate an increase in payroll and related expenses as a result of our
preparation for commercial operations, especially for the sales and marketing of
our product candidates.

Other Income (Expense), Net

Other income (expense) includes interest and gains earned on our cash and cash
equivalents, interest expense on term loan, amortization of debt issuance costs,
imputed interest on long term payables, loss on extinguishment of debt, foreign
currency exchange gains and losses, and gains and losses on sales of assets.

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Provision for Taxes on Income



Provision for taxes on income consists of net loss, taxed at federal tax rates
and adjusted for certain permanent differences. We maintain a full valuation
allowance against our net deferred tax assets. Changes in this valuation
allowance also affect the tax provision.



Results of Operations

Comparison of the Years Ended December 31, 2019, 2018, and 2017



The following table sets forth our results of operations for the years ended
December 31:



                                                2019         Change          2018        Change         2017
                                                           (in thousands, except percentage data)
Consolidated Statements of Operations Data
Collaboration revenue
License and milestone                        $   25,276           (52 )%   $  52,351          11 %    $  47,103
Other revenue                                     1,241             0 %        1,238          30 %          955
Total collaboration revenue                      26,517           (51 )%      53,589          12 %       48,058
Expenses
Research and development                        128,109            32 %       97,288          37 %       71,273
Reacquired license rights                       124,398           100 %            -           -              -
General and administrative                       58,298            78 %       32,748          41 %       23,260
Depreciation                                        932           116 %          431          (1 )%         437
Total expenses                                  311,737           139 %      130,467          37 %       94,970
Other income (expense), net                      (4,942 )         (36 )%      (3,642 )      (382 )%        (756 )
Loss before taxes on income                    (290,162 )        (260 )%     (80,520 )       (69 )%     (47,668 )
Provision for taxes on income                         8           (69 )%          26         767 %            3
Net loss                                     $ (290,170 )        (260 )%   $ (80,546 )       (69 )%   $ (47,671 )




Revenue

License and milestone revenue represented approximately 95%, 98%, and 98% of
total revenue for the years ended December 31, 2019, 2018, and 2017,
respectively, and consisted primarily of the recognition of deferred
revenue. License and milestone revenue decreased by 52% during 2019 compared to
2018, primarily due to additional revenue related to variable consideration that
was included in the transaction price under the KKC Agreement and recognized in
the prior year period. Since we did not have a similar event in the current
period, the revenue decreased by comparison. Additionally, revenue decreased due
to the Reacquisition Agreement in October 2019, which ended our performance
obligations under the Collaboration Agreement and resulted in the writing off of
the related remaining deferred revenue balance as reacquired license rights
expense, after which no further revenue was recognized. Total revenue expected
to be recognized from deferred revenue in 2020 is $4.7 million from the KKC
Agreement.

License and milestone revenue increased by 11% during 2018 compared to 2017. The
increase was primarily due to additional revenue of $22.5 million related to the
KKC Agreement, offset by the full recognition of deferred revenue for the AbbVie
License Agreement in November 2017.

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The following table summarizes the sources of our revenue for the years ended
December 31:



                                   2019         2018         2017
                                           (in thousands)
License and milestone
AbbVie license agreement         $      -     $      -     $ 18,420
AbbVie collaboration agreement     20,588       26,647       26,647
KKC agreement                       4,688       24,704        1,536
Other                                   -        1,000          500
Total license and milestone      $ 25,276     $ 52,351     $ 47,103
Other revenue                       1,241        1,238          955
Total collaboration revenue      $ 26,517     $ 53,589     $ 48,058

The following table summarizes our expenses, in thousands and as a percentage of total expenses, for the years ended December 31:





                                        % of                          % of                          % of
                                        Total                         Total                         Total
Description              2019         Expenses         2018         Expenses         2017         Expenses
Research and
development            $ 128,109              41 %   $  97,288              75 %   $  71,273              75 %
Reacquired license
rights                   124,398              40 %           -               -             -               -
General and
administrative            58,298              19 %      32,748              25 %      23,260              25 %
Depreciation                 932               0 %         431               0 %         437               0 %
Total expenses         $ 311,737                     $ 130,467                     $  94,970

Research and Development Expenses



Research and development expenses increased by 32% during 2019 compared to
2018. The increase was primarily due to $16.0 million in increased personnel and
equity compensation expenses to support growth of our development activities,
$3.8 million in increased medical affairs and other research activities to
support our registrational trials, and $9.8 million in increased manufacturing
to support product registration and increased clinical expenses for startup
activities for FALCON and the extension trials for our registrational programs,
which were offset by decreased clinical expenses for fully enrolled and
completed studies.

Research and development expenses increased by 37% during 2018 compared to
2017. The increase was primarily due to an increase in clinical and
manufacturing activities, primarily from increases totaling $24.9 million for
CARDINAL, PHOENIX, and part 2 of MOXIe, offset by decreases totaling $10.3
million in clinical and manufacturing activities related to REVEAL, MOTOR, and
RTA 901, which were completed in 2017. Additionally, research and development
expenses increased by $4.8 million in medical affairs activities in our
bardoxolone clinical programs, $4.6 million in personnel and equity compensation
expenses to support growth in our development activities, and $1.8 million in
additional discovery activities.

Research and development expenses, as a percentage of total expenses, was 41%,
75%, and 75% for 2019, 2018, and 2017, respectively. The decrease in 2019
compared to 2018 was primarily due to the reacquired license rights of $124.4
million incurred during 2019 and to increased general and administrative
expenses during related to rent, insurance premiums, and other office expenses.

Reacquired License Rights



Reacquired license rights increased by 100% during 2019 compared to 2018. The
increase was due to the Reacquisition Agreement we entered into with AbbVie in
October 2019 to reacquire the development, manufacturing, and commercialization
rights provided in the AbbVie License Agreement and the Collaboration
Agreement. For a complete discussion of accounting for reacquired license
rights, see Note 3, Collaboration Agreements of Notes to Consolidated Financial
Statements contained in this Annual Report on Form 10-K.

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General and Administrative Expenses



General and administrative expenses increased by 78% during 2019 compared to
2018. The increase was primarily due to $19.3 million in increased personnel and
equity compensation expenses and $5.6 million in increased rent, director and
officer insurance premiums, and other office expenses to support growth in our
development activities.

General and administrative expenses increased by 41% during 2018 compared to
2017. The increase was primarily due to $4.3 million in personnel, consulting,
and equity compensation expenses to support growth in our development
activities, $3.6 million sublicense fees and other expenses from the achievement
of the KKC milestone, and $2.2 million in commercial research activities.

General and administrative expenses, as a percentage of total expenses, was 19%,
25%, and 25% for 2019, 2018, and 2017, respectively. Although general and
administrative expenses increased during 2019 as discussed above, as a
percentage of total expenses, general and administrative expenses decreased
overall in 2019 compared to 2018, primarily due to the reacquired license rights
of $124.4 million incurred during 2019.

Other Income (Expense), Net



Other income (expense), net increased by 36% during the 2019 compared to 2018.
The increase was primarily due to $5.0 million in additional interest expense
that was attributable to borrowing additional amounts under the Term Loans in
June 2018 and December 2019, which was offset by $2.7 million in increased
interest income earned due to increases in our cash balance from the Term Loans
and our follow-on public offering in the fourth quarter of 2019.

Other income (expense), net increased by 382% during the 2018 compared to 2017.
The increase was primarily due to $4.7 million in additional interest expense
that was attributable to borrowing additional amounts under the Term A Loan in
June 2018, which was offset by $2.8 million in increased interest income earned
due to increases in our cash balance from the Term A Loan and our follow-on
public offering that occurred in July 2018.

Provision (Benefit) for Taxes

Provision (benefit) for taxes on income were immaterial during 2019, 2018, and 2017.

Liquidity and Capital Resources



Since our inception, we have funded our operations primarily through
collaboration and license agreements, the sale of preferred and common stock,
and secured loans. To date, we have raised gross cash proceeds of $476.6 million
through the sale of convertible preferred stock and $780.0 million from payments
under license and collaboration agreements. We also obtained $894.7 million in
net proceeds from our IPO and follow-on offerings of our Class A common stock
and $151.6 million in net proceeds from the Amended Restated Loan Agreement. We
have not generated any revenue from the sale of any products. As of December 31,
2019, we had available cash and cash equivalents of approximately
$664.3 million. Our cash and cash equivalents are invested in accordance with
our investment policy, primarily with a view to liquidity and capital
preservation.

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Cash Flows



The following table sets forth the primary sources and uses of cash for the
years ended December 31:



                                               2019          2018          2017
                                                        (in thousands)
Net cash (used in) provided by:
Operating activities                        $ (251,151 )   $ (83,783 )   $ (83,256 )
Investing activities                            (2,673 )        (679 )        (343 )
Financing activities                           580,358       292,472       128,647

Net increase in cash and cash equivalents $ 326,534 $ 208,010 $ 45,048






Operating Activities

Net cash used in operating activities was $251.2 million for the year ended
December 31, 2019, consisting primarily of net loss of $290.2 million adjusted
for non-cash items including stock-based compensation expense of $26.4 million,
depreciation and amortization expense of $2.3 million, and a net increase in
operating assets and liabilities of $10.3 million. The significant items in the
change in operating assets that impacted our use of cash in operations include
increases in accrued direct research and other current and long-term liabilities
of $12.0 million due to activities directly related to our clinical trials and
other activities to support our registrational trials, an increase in payables
to collaborators of $216.9 million primarily due to the remaining payable due to
AbbVie for the reacquisition of development, manufacturing, and
commercialization rights, a decrease in accounts payable of $2.1 million due to
timing of payments, and a decrease in deferred revenue of $216.3 million. The
decrease in deferred revenue is due to the ratable recognition of approximately
$25.2 million in revenue offset by the write off of the $191.1 million deferred
revenue balance related to the Collaboration Agreement, after our performance
obligations were terminated under the Reacquisition Agreement.

Net cash used in operating activities was $83.8 million for the year ended
December 31, 2018, consisting primarily of net loss of $80.5 million adjusted
for non-cash items including stock-based compensation expense of $10.6 million,
depreciation and amortization expense of $1.2 million, loss on extinguishment of
debt of $1.0 million, and a net decrease in operating assets and liabilities of
$16.1 million. The significant items in the change in operating assets and
liabilities include an increase of prepaid expenses and other current assets of
$1.1 million due to prepayments on trial and other operating expenses and
reimbursements due from KKC, an increase in accrued direct research and other
current liabilities of $4.4 million due to clinical and manufacturing
activities, an increase in accounts payable of $2.0 million due to timing of
vendor payment, and a decrease in deferred revenue of $21.4 million. The
decrease in deferred revenue relates to the ratable recognition of revenue over
the expected term of the performance obligations under our collaboration
agreements with AbbVie and KKC, which resulted in recognition of $51.4 million
of license and milestone revenue, offset by the achievement of regulatory
milestone of $30.0 million related to the KKC Agreement, which was recognized as
deferred revenue.

Net cash used in operating activities was $83.3 million for the year ended
December 31, 2017, consisting primarily of net loss of $47.7 million adjusted
for non-cash items including stock-based compensation expense of $6.5 million,
depreciation and amortization expense of $0.6 million, and a net decrease in
operating assets and liabilities of $42.7 million. The significant items in the
change in operating assets and liabilities include an increase of prepaid
expenses and other current assets of $1.3 million due to prepayments on trial
and other operating expenses and reimbursements due from KKC, an increase in
accrued direct research and other current liabilities of $7.0 million due to
clinical trial activities, a decrease in accounts payable of $1.8 million due to
timing of vendor payment, and a decrease in deferred revenue of $46.6
million. The decrease in deferred revenue relates to the timing of upfront
payments and ratable recognition of revenue over the expected term of the
performance obligations under our collaboration agreements with AbbVie and KKC,
resulting in recognition of $46.6 million of license and milestone revenue.

Investing Activities

Net cash used in investing activities was $2.7 million for the year ended December 31, 2019, primarily due to capital expenditures in connection with an expansion of our office space and purchases of property and equipment.


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Net cash used in investing activities of $0.7 million and $0.3 million were not significant for the years ended December 31, 2018 and 2017, respectively.

Financing Activities



Net cash provided by financing activities for the year ended December 31, 2019
was $580.4 million, primarily due to net proceeds of $492.4 million from our
follow-on public offering and $75.0 million from the Amended Restated Loan
Agreement.

Net cash provided by financing activities for the year ended December 31, 2018
was $292.5 million, primarily due to net proceeds of $232.9 million from our
follow-on public offering and $57.7 million from the Restated Loan Agreement.

Net cash provided by financing activities for the year ended December 31, 2017
was $128.6 million, primarily due to net proceeds of $108.5 million from our
follow-on public offering and $19.5 million from the Amended Loan Agreement.

Operating Capital Requirements



To date, we have not generated any revenue from product sales. We do not know
when or whether we will generate any revenue from product sales. We do not
expect to generate significant revenue from product sales unless and until we
obtain regulatory approval of and commercialize one or more of our current or
future product candidates. We anticipate that we will continue to generate
losses for the foreseeable future, and we expect the losses to increase as we
continue the development of, and seek regulatory approvals for, our product
candidates, and begin to commercialize any approved products. We are subject to
all the risks related to the development and commercialization of novel
therapeutics, and we may encounter unforeseen expenses, difficulties,
complications, delays, and other unknown factors that may adversely affect our
business. We continue to incur additional costs associated with operating as a
public company. We anticipate that we will need substantial additional funding
in connection with our continuing operations.

On November 18, 2019, we closed a follow-on underwritten public offering of 2,760,000 shares of our Class A common stock for gross proceeds of $505.1 million. Net proceeds to us from the offering were approximately $491.9 million, after deducting underwriting discounts and commissions and offering expenses.



On October 15, 2019, we entered into the 2019 Lease Agreement, relating to the
lease of approximately 327,400 square feet of office and laboratory space
located in Plano, Texas. The term of the Lease is estimated to commence
mid-2022, when construction is completed, and continue for 16 years, with up to
10 years of extension at our option. The initial annual base rent will be
determined based on the project cost, subject to an initial annual cap of
approximately $13.3 million, which may increase in certain
circumstances. Beginning in the third lease year, the base rent will increase
1.95% per annum each year. In addition to the annual base rent, we will pay for
taxes, insurance, utilities, operating expenses, assessments under private
covenants, maintenance and repairs, certain capital repairs and replacements,
and building management fees.

On October 9, 2019, we and AbbVie entered into the Reacquisition Agreement
pursuant to which we reacquired the development, manufacturing, and
commercialization rights concerning our proprietary Nrf2 activator product
platform originally licensed to AbbVie in the AbbVie License Agreement and the
Collaboration Agreement. In exchange for such rights, we will pay AbbVie $330.0
million, of which $100.0 million was paid as of December 31, 2019, $150.0
million is payable on June 30, 2020, and $80.0 million is payable on November
30, 2021. We will also pay AbbVie an escalating, low single-digit royalty on
worldwide net sales, on a product-by-product basis, of omaveloxolone and an
identified list of certain next-generation Nrf2 activators. The termination of
our deferred revenue balance will not have an impact on our cash flow.

In November 2017, we entered into an at-the-market equity offering sales agreement with Stifel, Nicolaus & Company, Incorporated, that established a program pursuant to which it may offer and sell up to $50.0 million of its Class A common stock from time to time in at-the-market transactions. In November 2019, we suspended the


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program in connection with the November 2019 equity offering, which remains suspended until we notify Stifel otherwise. To date, no sales have been made under our at-the-market offering program.



Our longer term liquidity requirements will require us to raise additional
capital, such as through additional equity, debt, or royalty financings or
collaboration arrangements. Our future capital requirements will depend on many
factors, including the receipt of milestones under our KKC Agreement and the
timing of our expenditures related to clinical trials. We believe our existing
cash and cash equivalents will be sufficient to enable us to fund our operations
through the end of 2021. However, we anticipate opportunistically raising
additional capital before that time through equity offerings, collaboration or
license agreements, additional debt, or royalty financings in order to maintain
adequate capital reserves. In addition, we may choose to raise additional
capital at any time for the further development of our existing product
candidates and may also need to raise additional funds sooner to pursue other
development activities related to additional product candidates. Decisions about
the timing or nature of any financing will be based on, among other things, our
perception of our liquidity and of the market opportunity to raise equity, debt,
or royalty financing. Additional securities may include common stock, preferred
stock, or debt securities. We may explore strategic collaborations or license
arrangements for any of our product candidates. If we do explore any
arrangements, there can be no assurance that any agreement will be reached, and
we may determine to cease exploring a potential transaction for any or all of
the assets at any time. If an agreement is reached, there can be no assurance
that any such transaction would provide us with a material amount of additional
capital resources.

Until we can generate a sufficient amount of revenue from our product
candidates, if ever, we expect to finance future cash needs through public or
private equity or debt offerings, commercial loans, royalty financings, and
collaboration or license transactions. Additional capital may not be available
on reasonable terms, if at all. If we are unable to raise additional capital in
sufficient amounts or on terms acceptable to us, we may have to significantly
delay, scale back, or discontinue the development or commercialization of one or
more of our product candidates. If we raise additional funds through the
issuance of additional equity or debt securities, it could result in dilution to
our existing stockholders or increased fixed payment obligations, and any such
securities may have rights senior to those of our common stock. If we incur
indebtedness, we could become subject to covenants that would restrict our
operations and potentially impair our competitiveness, such as limitations on
our ability to incur additional debt, limitations on our ability to acquire,
sell, or license intellectual property rights, and other operating restrictions
that could adversely affect our ability to conduct our business, and any such
debt could be secured by some or all of our assets. Any of these events could
significantly harm our business, financial condition, and prospects.

Our forecast of the period through which our financial resources will be
adequate to support our operations is a forward-looking statement and involves
risks and uncertainties, and actual results could vary as a result of a number
of factors. 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. Our future funding requirements, both near- and long-term,
will depend on many factors, including, but not limited to:

• the scope, rate of progress, results, and cost of our clinical


             trials, preclinical testing, and other activities related to the
             development of our product candidates;


  • the number and characteristics of product candidates that we pursue;


        •    the costs of development efforts for our product candidates that are
             not subject to reimbursement from our collaborators;


        •    the costs necessary to obtain regulatory approvals, if any, for our
             product candidates in the United States and other

jurisdictions, and


             the costs of post-marketing studies that could be required by
             regulatory authorities in jurisdictions where approval is obtained;


        •    the continuation of our existing collaboration with KKC and entry
             into new collaborations and the receipt of any collaboration
             payments;


        •    the time and unreimbursed costs necessary to commercialize products
             in territories in which our product candidates are approved for sale;


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        •    the revenue from any future sales of our products for which we are
             entitled to a profit share, royalties, and milestones;

• the level of reimbursement or third-party payor pricing available to


             our products;


        •    the costs of obtaining third-party commercial supplies of our
             products, if any, manufactured in accordance with regulatory
             requirements;


        •    the costs associated with any potential loss or corruption of our
             information or data in a cyberattack on our computer system;


  • the costs associated with being a public company; and


        •    the costs we incur in the filing, prosecution, maintenance, and
             defense of our patent portfolio and other intellectual property
             rights.

If we cannot expand our operations or otherwise capitalize on our business opportunities because we lack sufficient capital, our business, financial condition, and results of operations could be materially adversely affected.

Contractual Obligations and Commitments

Contractual Obligations

As of December 31, 2019, our contractual obligations were as follows:





                                               Payments due by period
                                 Less than       1 to 3        4 to 5
                                   1 year         years        years         Total
                                                     (unaudited)
                                                   (in thousands)
Operating lease obligations(1)   $    3,649     $   7,986     $      -     $  11,635
Outstanding term loan                     -       122,708       32,292       155,000
Payable to collaborators            150,000        80,000            -       230,000

Total contractual obligations $ 153,649 $ 210,694 $ 32,292 $ 396,635

(1) Total minimum future lease payments for the Plano build-to-suit lease has

not commenced as of December 31, 2019 are not included in the consolidated

financial statement, as we do not yet control of the underlying

assets. The lease is expected to commence mid-2022 with lease initial

lease term of 16 years.

Clinical Trials



As of December 31, 2019, we have several on-going clinical trials in various
stages. Under agreements with various CROs and clinical trial sites, we incur
expenses related to clinical trials of our product candidates and potential
other clinical candidates. The timing and amounts of these disbursements are
contingent upon the achievement of certain milestones, patient enrollment, and
services rendered or as expenses are incurred by the CROs or clinical trial
sites. Therefore, we cannot estimate the potential timing and amount of these
payments and they have been excluded from the table above.

Critical Accounting Policies and Significant Judgments and Estimates



Our management's discussion and analysis of our financial condition and results
of operations are based on our consolidated financial statements, which have
been prepared in accordance with United States generally accepted accounting
principles. The preparation of these financial statements requires us to make
estimates and judgments that affect the reported amounts of assets, liabilities,
and expenses and the disclosure of contingent assets and liabilities in our
financial statements. On an ongoing basis, we evaluate our estimates and
judgments, including those related to revenue recognition, accrued research and
development expenses, income taxes, and stock-based compensation. We base our
estimates on historical experience, known trends and events, and various other
factors that we believe to be reasonable under the circumstances, the results of
which form the basis for making judgments

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about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.



While our significant accounting policies are described in more detail in Note 2
of Notes to Consolidated Financial Statements appearing elsewhere in this Annual
Report, we believe the following accounting policies to be most critical to
understanding the judgments and estimates used by management in the preparation
of our financial statements.

Revenue Recognition

We currently recognize revenue generated primarily from licensing fees received
under our collaborative licensing agreements with AbbVie and KKC and
reimbursements for expenses from KKC. The terms of the agreements include
non-refundable upfront fees, funding of research and development activities,
payments based upon achievement of milestones, and royalties on net product
sales.

Under Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with
Customers (Topic 606), an entity recognizes revenue when its customer obtains
control of promised goods or services, in an amount that reflects the
consideration which the entity expects to receive in exchange for those goods or
services. To determine revenue recognition for arrangements that an entity
determines are within the scope of Topic 606, the entity performs the following
five steps: (i) identify the promised goods or services in the contract with a
customer; (ii) identify the performance obligations in the contract; (iii)
determine the transaction price, including the constraint on variable
consideration; (iv) allocate the transaction price to the performance
obligations in the contract; and (v) recognize revenue when or as the entity
satisfies a performance obligation.

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
obligation when or as the performance obligation is satisfied.

Licenses of intellectual property: If a license to our intellectual property is
determined to be distinct from the other performance obligations identified in
the arrangement, we recognize revenue from non-refundable, up-front fees
allocated to the license when the license is transferred to the customer, and
the customer can 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 progress for purposes of recognizing revenue from
non-refundable, up-front fees. We evaluate the measure of progress each
reporting period and, if necessary, adjust the measure of performance and
related revenue recognition.

Milestone payments: At the inception of each arrangement that includes milestone
payments, we evaluate whether the milestones are considered probable of being
achieved and estimate the amount to be included in the transaction price using
the most likely amount method. If it is probable that a significant revenue
reversal would not occur, the value of the associated milestone (such as a
regulatory submission by us) is included in the transaction price, which is then
allocated to each performance obligation. Milestone payments that are not within
our control, such as approvals from regulators, are not considered probable of
being achieved until those approvals are received. At the end of each subsequent
reporting period, we re-evaluate the probability of achievement of such
development milestones and, if necessary, adjust our estimate of the overall
transaction price. Any such adjustments are recorded on a cumulative catch-up
basis, which would affect license, collaboration, and other revenues and
earnings in the period of adjustment and in future periods through the end of
the performance obligation period.

Royalties: For arrangements that include sales-based royalties, including
milestone payments based on the level of sales, and where the license is deemed
to be the predominant item to which the royalties relate, we recognize revenue
at the later of (a) when the related sales occur, or (b) when the performance
obligation to which some or all of the royalty has been allocated has been
satisfied (or partially satisfied). To date, we have not recognized any royalty
revenue resulting from any of its licensing arrangements.

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Manufacturing Supply Services: Arrangements that include a promise for future
supply of drug substance or drug product for either clinical development or
commercial supply at the customer's discretion are generally considered
options. We assess if these options provide a material right to the licensee
and, if so, they are accounted for as separate performance obligations. If we
are entitled to additional payments when the customer exercises these options,
any additional payments are recorded when the customer obtains control of the
goods, which is upon delivery.

For a complete discussion of accounting for collaborative licensing agreements,
see Note 3, Collaboration Agreements of Notes of Consolidated Financial
Statements contained in this Annual Report on Form 10-K. Our revenue to date has
been generated primarily from licensing fees received under our collaborative
licensing agreements with AbbVie and KKC and reimbursements for expenses from
KKC. The terms of the agreements include non-refundable upfront fees, funding of
research and development activities, payments based upon achievement of
milestones, and royalties on net product sales.

Research and Development Costs



All research and development costs are expensed as incurred, including costs for
drug supplies used in research and development or clinical trials, property and
equipment acquired specifically for a finite research and development project,
and nonrefundable deposits incurred at the initiation of research and
development activities. Research and development costs consist principally of
costs related to clinical trials managed directly by us and through CROs,
manufacture of clinical drug products for clinical trials, preclinical study
costs, discovery research expenses, facilities costs, salaries, and related
expenses.

As part of the process of recording research and development costs, we are required to estimate and accrue expenses, the largest of which are research and development expenses. This process involves the following:



     •    communicating with appropriate internal personnel to identify services
          that have been performed on our behalf and estimating the level of

service performed and the associated cost incurred for the service when

we have not yet been invoiced or otherwise notified of actual cost;




     •    estimating and accruing expenses in our consolidated financial
          statements as of each balance sheet date based on facts and
          circumstances known to us at the time; and

• periodically confirming the accuracy of our estimates with service

providers and making adjustments, if necessary.

Examples of estimated research and development expenses that we accrue include:

• payments to CROs in connection with preclinical and toxicology studies


          and clinical trials;


  • payments to investigative sites in connection with clinical trials;


     •    payments to CMOs in connection with the production of clinical trial
          materials; and


  • professional service fees for consulting and related services.


We base our expense accruals related to clinical trials on our estimates of the
services received and efforts expended pursuant to contracts with multiple
research institutions and CROs that conduct and manage clinical trials on our
behalf. The financial terms of these agreements vary from contract to contract
and may result in uneven payment flows. Payments under some of these contracts
depend on factors such as the successful enrollment of patients and the
completion of clinical trial milestones. In accruing costs, we estimate the time
period over which services will be performed and the level of effort to be
expended in each period. If we do not identify costs that we have begun to incur
or if we underestimate or overestimate the level of services performed or the
costs of these services, our actual expenses could differ from our estimates.

To date, we have not experienced significant changes in our estimates of accrued
research and development expenses after a reporting period. However, due to the
nature of estimates, we cannot assure you that we will not

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make changes to our estimates in the future as we become aware of additional information about the status or conduct of our clinical trials and other research activities.

Income Taxes



We account for income taxes and the related accounts under the liability
method. Deferred tax assets and liabilities are determined based on differences
between the financial statement and tax bases of assets and liabilities and are
measured using the enacted tax rates and laws that are expected to be in effect
when the differences are expected to reverse. The measurement of a deferred tax
asset is reduced, if necessary, by a valuation allowance if it is more likely
than not that some portion or all of the deferred tax asset will not be
realized.

Realization of deferred tax assets is generally dependent upon future earnings,
if any, the timing and amount of which are uncertain. As of December 31, 2019,
based on known factors, we cannot conclude that it is more likely than not that
the remaining deferred tax assets will be utilized, and we have recorded a
valuation allowance to fully offset its deferred tax assets.

We account for uncertain tax positions in accordance with the provisions of
ASC 740, Income Taxes. We recognize tax benefit for uncertain tax positions if
we believe it is more likely than not that the position will be upheld on audit
based solely on the technical merits of the tax position. We evaluate uncertain
tax positions after consideration of all available information.

Stock-Based Compensation



We measure and recognize compensation expense for all stock option and
restricted stock awards based on the estimated fair value of the award on the
grant date. We use the Black-Scholes option pricing model to estimate the fair
value of stock option awards. The fair value is recognized as expense, over the
requisite service period, which is generally the vesting period of the
respective award, on a straight-line basis when the only condition to vesting is
continued service. If vesting is subject to a market or performance condition,
recognition is based on the derived service period of the award. Expense for
awards with performance conditions is estimated and adjusted on a quarterly
basis based upon the assessment of the probability that the performance
condition will be met. Use of the Black-Scholes option-pricing model requires
management to apply judgment under highly subjective assumptions. These
assumptions include:

• Expected term -The expected term represents the period that the

stock-based awards are expected to be outstanding and is based on the

average period the stock options are expected to be outstanding and was

based on our historical information of the options exercise patterns and

post-vesting termination behavior.

• Expected volatility -Since we do not have sufficient trading history to

estimate the volatility of our common stock, the expected volatility was

estimated based on our own historical volatility since our IPO and the

average volatility for comparable publicly traded biopharmaceutical

companies. When selecting comparable publicly traded biopharmaceutical

companies on which we based our expected stock price volatility, we

selected companies with comparable characteristics to us, including

enterprise value, risk profiles, position within the industry, and

historical share price information sufficient to meet the expected life

of the stock-based awards.

• Risk-free interest rate -The risk-free interest rate is based on the

United States Treasury zero coupon issues in effect at the time of grant

for periods corresponding with the expected term of option.

• Expected dividend -We have no plans to pay dividends on our common

stock. Therefore, we used an expected dividend yield of zero.

We will continue to use judgment in evaluating the expected volatility and expected terms utilized for our stock-based compensation calculations on a prospective basis. We account for forfeitures of share-based awards when they occur.



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Stock option and restricted stock awards have been granted or sold at fair value
to nonemployees, in connection with research and consulting services provided to
us, and to employees, in connection with Stock Purchase and Restriction
Agreements. Equity awards generally vest over terms of four or five years. For
employees, stock-based compensation expense is recorded ratably through the
vesting period for each stock option or tranche of restricted stock award. For
option awards with performance conditions, we evaluate the probability of the
number of shares that are expected to vest and adjust compensation expense to
reflect the number of shares expected to vest and the cumulative vesting period
met to date.

The weighted-average assumptions used in the Black-Scholes option pricing model
were as follows:



                                             Years Ended December 31
                                           2019        2018        2017
Dividend yield                                  - %         - %         - %
Volatility                                  73.73 %     72.77 %     75.14 %
Risk-free interest rate                      2.18 %      2.79 %      2.19 %

Expected term of options (in years) 6.23 6.35 6.37 Weighted average grant date fair value $ 69.76 $ 38.14 $ 25.00




Leases



We determine if an arrangement is a lease at inception. Lease assets represents
our right to use an underlying asset for the lease term, and lease liabilities
represent our obligation to make lease payments arising from the lease. These
assets and liabilities are initially recognized at the lease commencement date
based on the present value of lease payments over the lease term calculated
using its incremental borrowing rate based on the information available at
commencement unless the implicit rate is readily determinable. Lease assets also
include upfront lease payments, lease incentives paid, and direct costs incurred
and exclude lease incentives received. The lease term used to calculate the
lease assets and related lease liabilities includes the options to extend or
terminate the lease when it is reasonably certain that we will exercise those
options. Lease expense for operating leases is recognized on a straight-line
basis over the expected lease term as an operating expense while the expense for
finance leases is recognized as depreciation expense over the expected lease
term unless there is a transfer of title or purchase option reasonably certain
of exercise.

We will account for each separate lease component separately from the nonlease
components. The depreciable life of lease assets and leasehold improvements is
limited by the expected lease term unless there is a transfer of title or
purchase option reasonably certain of its exercise.

Leases with an initial term of 12 months or less are not recorded on the balance sheet, and the expense for these short-term leases and operating leases is recognized on a straight-line basis over the lease term.

Off-Balance Sheet Arrangements



Since our inception, we have not had any relationships with unconsolidated
organizations or financial partnerships, such as structured finance or special
purpose entities that would have been established for the purpose of
facilitating off-balance sheet arrangements, and we have not engaged in any
other off-balance sheet arrangements, as defined in the rules and regulations of
the SEC.

Recent Accounting Pronouncements



For a discussion of recent accounting pronouncements, please see Note 2 of Notes
to Consolidated Financial Statements contained in this Annual Report on Form
10-K.



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