The following discussion should be read in conjunction with our financial
statements and accompanying footnotes appearing elsewhere in this Quarterly
Report on Form 10-Q and our audited consolidated financial statements and
related footnotes included in our Annual Report on Form 10-K for the year ended
December 31, 2019. Some of the information contained in this discussion and
analysis or set forth elsewhere in this Quarterly Report on Form 10-Q includes
forward-looking statements that involve risks and uncertainties. Actual results
may differ significantly from those projected in the forward-looking statements.
Factors that might cause future results to differ materially from those
projected in the forward-looking statements include, but are not limited to, the
risks related to the continuing impact of COVID-19 as well as the other risks
set forth under the section titled "Risk Factors" in this Quarterly Report on
Form 10-Q. Please also see the section entitled "Special Note Regarding
Forward-Looking Statements." You should, therefore, not rely on these
forward-looking statements as representing our views as of any date subsequent
to the date of this Quarterly Report on Form 10-Q.

Overview



We are a clinical-stage gene therapy company leveraging breakthroughs in human
genetics with the goal of developing and commercializing disease-modifying
AAV-based gene therapies for patients with devastating neurodegenerative
diseases. We are applying a precision medicine approach to neurodegeneration by
studying our gene therapies in genetically defined patient populations. We
believe this approach will increase the probability of creating
disease-modifying therapies that improve patients' lives. Our lead
clinical-stage programs are PR001 for the treatment of PD-GBA and nGD, and PR006
for the treatment of FTD-GRN. We are also focused on developing a broad pipeline
of gene therapies for a range of neurodegenerative diseases, including PR004 for
the treatment of synucleinopathies, and other programs.

The PROPEL trial, our Phase 1/2 clinical trial of PR001 for the treatment of
PD-GBA patients, is ongoing. The PROPEL trial is open-label and is investigating
the safety and tolerability of PR001 and also measuring key biomarkers and
exploratory efficacy endpoints. Two patients enrolled in the PROPEL trial under
a previous version of the protocol that included a sham procedure arm, one who
received PR001 and another who received the sham procedure. In the patient who
received PR001, evidence of central nervous system, or CNS, transduction of
PR001 was observed resulting in an increase in cerebrospinal fluid, or CSF,
beta-glucocerebrosidase, or GCase, enzyme activity from undetectable at baseline
to within the normal range at approximately three months following PR001
treatment. In addition, approximately three months following PR001
administration, this patient developed severe adverse events, or SAEs, that are
presumed to have been an immune-mediated response to AAV9. The patient received
immunosuppressive treatment and the SAEs resolved. We modified the
immunosuppression regimen in the clinical protocol for the PROPEL trial by
adding sirolimus and reducing the steroid dose. In November 2020, we continued
dosing in the PROPEL trial under the updated clinical protocol. We currently
intend to provide the next biomarker and safety analysis on a subset of patients
enrolled in the PROPEL trial by mid-2021.

The PROVIDE trial, our Phase 1/2 clinical trial of PR001 for the treatment of
Type 2 Gaucher disease patients, is recruiting. We currently intend to initiate
enrollment in the PROVIDE Phase 1/2 clinical trial for patients with Type 2
Gaucher disease in the fourth quarter of 2020. The PROVIDE trial is open-label
and will investigate the safety and tolerability of PR001 as well as key
biomarkers and exploratory efficacy endpoints. The optimized immunosuppression
regimen used in the amended PROPEL trial has also been implemented in the
PROVIDE trial. In January 2020, we announced that we had granted a compassionate
use request for the administration of PR001 to a patient with Type 2 Gaucher
disease. Evidence of CNS transduction of PR001 was observed resulting in an
increase in CSF GCase enzyme activity from undetectable at baseline to within
the normal range at approximately four months following PR001 treatment.
Additionally, we announced in August 2020 that we granted a second compassionate
use request for the administration of PR001 to a patient with nGD, following
approval by an international regulatory authority. PR001 administration was
well-tolerated in both patients and no PR001-related adverse events have been
reported in either patient. Follow-up clinical observation of both patients is
ongoing. We currently anticipate that we will provide the next update on PR001
biomarker and safety data for nGD in 2021.

The FDA has granted PR001 Orphan Drug designation for the treatment of Gaucher
disease and Rare Pediatric Disease Designation for the treatment of nGD. In
addition, the FDA has granted Fast Track designation for PR001 for the treatment
of PD-GBA, and in October 2020 the FDA granted Fast Track designation for PR001
for the treatment of nGD. In our comprehensive preclinical program in both mouse
models and non-human primates, PR001 was observed to be well tolerated and
demonstrated robust and widespread biodistribution. Additionally, in mouse
models, we observed significant increases in enzyme activity, reductions in
lipid accumulation and improvements in motor function.

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The PROCLAIM trial, our Phase 1/2 clinical trial of PR006 for the treatment of
FTD-GRN patients, is recruiting, and we anticipate initiating enrollment in the
fourth quarter of 2020. The PROCLAIM trial is open-label and will investigate
the safety and tolerability of PR006 as well as key biomarkers and exploratory
efficacy endpoints. We anticipate that this trial will enroll up to 15 patients.
The optimized immunosuppression regimen used in the amended PROPEL trial has
also been implemented in the PROCLAIM trial. We currently anticipate that we
will provide a biomarker and safety analysis on a subset of patients in the
PROCLAIM trial in 2021.

The FDA has granted Fast Track designation for PR006 for the treatment of
FTD-GRN and Orphan Drug designation for PR006 for the treatment of FTD. In our
comprehensive preclinical program in in vitro models, mouse models and non-human
primates, PR006 was observed to be well tolerated and demonstrated robust and
widespread biodistribution. Additionally, in mouse models, PR006 increased
expression of progranulin protein in the brain and CSF, reduced indicators of
lysosomal dysfunction in the brain, and suppressed expression of markers of
inflammation in the brain.

In 2019, we announced our strategic collaboration with Lonza, with whom we have
been working since 2018, with an initial focus on process development and good
manufacturing practices, or GMP manufacturing of our two lead programs, PR001
and PR006. Under this collaboration, focused on the baculovirus/Sf9 production
system for gene therapies, we and Lonza work together closely on process
development and scaling up production of PR001 and PR006, and Lonza will
manufacture PR001 and PR006 for late-stage clinical and commercial supply at its
gene therapy center of excellence in Houston, Texas. The collaboration also has
the potential to extend to our future pipeline of AAV-based gene therapy
programs. In collaboration with Lonza, we have developed and scaled up a process
that demonstrates promising yield and potency, and our GMP manufacturing is
underway. We are progressing studies and assessments to evaluate comparability
between the material produced in the baculovirus/Sf9 production system and the
material produced in the HEK293 production system.

The extent of the impact of the COVID-19 pandemic on our business, operations
and clinical development timelines and plans, including the resulting impact on
our expenditures and capital needs, remains uncertain, and will depend on
certain developments such as the continued duration and spread of the outbreak
and its impact on our clinical trial enrollment, trial sites, partners, contract
research organizations, or CROs, third-party manufacturers, and other third
parties with whom we do business, as well as its impact on regulatory
authorities and our key scientific and management personnel. For example, in
response to the COVID-19 pandemic, patient screening and enrollment at active
trial sites for the PROPEL trial were temporarily suspended. Several sites have
now resumed patient screening and enrollment activities; however, due to the
implementation of the protocol amendment to the PROPEL trial described above, we
now anticipate that we will continue enrollment in the second half of 2020.
Other closures or delays due to COVID-19, including those that have not yet
happened or been reported, could also impact any of our anticipated clinical
development timelines.

To the extent possible, we are conducting business as usual, with necessary or
advisable modifications to employee travel and employee work locations. We will
continue to actively monitor the rapidly evolving situation related to COVID-19
and may take further actions that alter our operations, including those that may
be required by federal, state or local authorities, or that we determine are in
the best interests of our employees, partners and other third parties with whom
we do business.

Since our inception, we have focused primarily on organizing and staffing our
company, raising capital, establishing and protecting our intellectual property
portfolio, in-licensing the rights to AAV9 in particular fields, developing and
progressing our gene therapy product candidates through preclinical studies and
preparing for, initiating and conducting our clinical trials, and establishing
our manufacturing platform to ensure clinical and preclinical supplies are
available. We do not have any product candidates approved for sale and have not
generated any revenue from product sales as of September 30, 2020. On June 24,
2019, we completed our initial public offering, or IPO, whereby we sold an
aggregate of 7,353,000 shares of our common stock at a price of $17.00 per
share. The aggregate net proceeds received by us from the offering were
approximately $113.0 million, after deducting underwriting discounts and
commissions and offering expenses payable by us of $12.0 million. Prior to our
IPO, we funded our operations primarily through equity and convertible debt
financings and raised an aggregate of approximately $129.0 million of gross
proceeds through these offerings. In August 2020, we entered into an Open Market
Sale AgreementSM, or Sales Agreement, with Jefferies LLC, or Jefferies, as sales
agent, pursuant to which we may offer and sell, from time to time, through
Jefferies, shares of our common stock having an aggregate offering price of up
to $75.0 million.

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We have incurred significant operating losses to date. Our ability to generate
product revenue sufficient to achieve profitability will depend heavily on the
successful development and eventual commercialization of one or more of our
current or future product candidates and programs. Our net losses were $59.3
million and $45.3 million for the nine months ended September 30, 2020 and 2019,
respectively. We expect our expenses and losses to increase as we continue to
advance our product candidates from discovery and research, through preclinical
development, into human clinical trials and seek regulatory approval of our
product candidates. Furthermore, we expect to incur additional costs associated
with operating as a public company, including significant legal, audit,
accounting, director and officer liability insurance, investor relations and
other expenses that we did not incur as a private company. Our net losses may
fluctuate significantly from quarter-to-quarter and year-to-year, depending on
the timing of our clinical trials and our expenditures on other research and
development activities.

We do not have any products approved for sale. We do not expect to generate any
revenue from product sales unless and until we successfully complete development
and obtain regulatory approval for one or more of our product candidates, which
we expect will take a number of years. If we obtain regulatory approval for any
of our product candidates, we expect to incur significant commercialization
expenses related to product sales, marketing, manufacturing and distribution.
Accordingly, until such time as we can generate substantial product revenues to
support our cost structure, if ever, we expect to finance our cash needs through
equity offerings, debt financings or other capital sources, including
potentially collaborations, licenses and other similar arrangements. However, we
may be unable to raise additional funds or enter into such other arrangements
when needed on favorable terms or at all. Our failure to raise capital or enter
into such other arrangements when needed could have a negative impact on our
financial condition and on our ability to pursue our business plans and
strategies. If we are unable to raise additional capital when needed, we could
be forced to delay, limit, reduce or terminate our product candidate development
or future commercialization efforts or grant rights to third parties to develop
and market our product candidates even if we would otherwise prefer to develop
and market such product candidates ourselves.

As of September 30, 2020 and December 31, 2019, we had cash, cash equivalents and investments of $114.3 million and $168.1 million, respectively.

License Agreements

License Agreement with REGENXBIO Inc. for GBA1



In August 2017, we entered into a license agreement, or the REGENXBIO GBA1
License, with REGENXBIO. Under the REGENXBIO GBA1 License, REGENXBIO granted us
an exclusive, worldwide license under certain patents and patent applications to
make, have made, use, import, sell and offer for sale products for the treatment
of disease, including but not limited to Parkinson's disease and Gaucher
disease, whether or not caused by mutations in the gene that produces the GBA1
enzyme in humans by in vivo gene therapy using AAV9 delivering the gene (or any
portion thereof) encoding for GBA1.

As consideration for the licensed rights under the REGENXBIO GBA1 License, we
issued 2,430,000 shares of our common stock in a concurrent private placement to
REGENXBIO. We are also obligated, pursuant to the REGENXBIO GBA1 License, to pay
REGENXBIO: (1) an annual maintenance fee; (2) mid- to high-single digit royalty
percentages on net sales of licensed products, subject to reduction in specified
circumstances; and (3) mid-teen to low-twenties royalty percentages of any
sublicense fees we receive from sublicensees for the licensed intellectual
property rights. See Note 3 to our financial statements appearing elsewhere in
this report for additional information regarding this license.

License Agreement with REGENXBIO Inc. for Option Genes



In May 2018, we entered into a license agreement, or the REGENXBIO Option Genes
License, with REGENXBIO pursuant to which REGENXBIO granted us three distinct
exclusive options for specified genes, or the Option Genes, which were
exercisable at our sole discretion through May 10, 2019. Each option represented
the right to obtain an exclusive, worldwide license under certain patents and
patent applications to make, have made, use, import, sell and offer for sale
products for the treatment or prevention of disease, including but not limited
to Parkinson's disease, whether or not caused by mutations in any Option Gene
that is the subject of the applicable license, in humans by in vivo gene therapy
using AAV9 delivering the applicable licensed Option Gene and/or RNA
interference or antisense modalities that target the applicable licensed Option
Gene.

In April 2019, we exercised all three options, including for AAV9 delivering the
genes encoding for progranulin and a-Synuclein, and paid the additional up-front
fee of $0.6 million per option, or an aggregate of $1.8 million, to REGENXBIO.

In addition, with respect to each licensed Option Gene, we are required to pay
REGENXBIO: (1) an annual maintenance fee; (2) mid- to high-single digit royalty
percentages on net sales of the licensed product, subject to reduction in
specified circumstances; and (3)

                                       22

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mid-teen to low-twenties royalty percentages of any sublicense fees we receive
from sublicensees for the licensed intellectual property rights. If a licensed
product includes the GBA1 gene and otherwise would be subject to royalties under
the REGENXBIO GBA1 License, then royalties for that licensed product will only
be due under the REGENXBIO Option Genes License. See Note 3 to our financial
statements appearing elsewhere in this report for additional information
regarding this license.

Financial Operations Overview

Research and Development Expenses



Research and development expenses are recognized as incurred. These costs are
comprised of internal and external expenses, including costs incurred for the
manufacture of clinical and preclinical supply and process development
initiatives, costs incurred in preparation for and conduct of clinical trials,
and costs for activities related to regulatory filings for our product
candidates and preclinical and discovery work on our gene therapy product
candidates. Payments made prior to the receipt of goods or services rendered are
capitalized and recognized as expense as the goods are delivered or services are
performed. Research and development expenses include or could include:

• Employee and related expenses, including salaries, bonuses, benefits,

stock-based compensation, other related costs for those employees involved

in research and development functions;

• external research and development expenses incurred under agreements with

CROs, investigative sites, consultants and vendors engaged to conduct our

clinical and preclinical studies or provide the research and development

services;

• costs related to manufacturing material for our preclinical studies,

clinical trials, and manufacturing process development efforts, including


        fees paid to contract development and manufacturing organizations, or
        CDMOs;


  • laboratory supplies, minor equipment and research materials;


• payments made under existing or for new third-party license agreements;




  • costs associated with compliance with regulatory requirements; and

• facilities expenses, which includes direct and allocated cost for fixed

and variable lease expense, depreciation and amortization of equipment and

leasehold improvements, and other operating costs.




We expect our research and development expenses to increase as we continue to
advance our clinical stage product candidates and manufacturing processes and
secure clinical and preclinical supply, as well as continue to conduct discovery
and research activities for our preclinical programs. We cannot determine with
certainty the timing of the initiation, the duration or the cost to complete
current or future clinical trials and preclinical studies of our product
candidates and pipeline programs due to the inherently unpredictable nature of
clinical and preclinical development. Clinical and preclinical development
timelines, the probability of success and development costs can differ
materially from expectations. We anticipate that we will make determinations as
to which product candidates to pursue and the level of funding to direct to each
product candidate on an ongoing basis in response to the results of ongoing and
future clinical trials and preclinical studies, regulatory developments and our
ongoing assessments as to each product candidate's commercial potential. We will
need to raise substantial additional capital in the future. Our clinical
development costs are expected to increase significantly as we initiate and
advance our clinical trials. Our future expenses may vary significantly each
period based on factors such as:

  • per patient trial costs;


  • the number of patients enrolled in each trial;


  • the number of trials required for regulatory approval;


  • any follow-up commitment or confirmatory trials;


  • the number of sites included in the trials;


  • the countries in which the trials are conducted;


  • the length of time required to enroll eligible patients;


  • the drop-out or discontinuation rates of patients;

• potential additional safety monitoring requested by regulatory agencies;




  • the duration of patient participation in the trials and follow-up;


  • the phase of development of the product candidate; and


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  • the efficacy and safety profile of the product candidate.

General and Administrative Expenses



General and administrative expenses are comprised of employee and related
expenses, third-party service provider costs, such as legal, investor relations,
audit, finance and accounting, market research and insurance. All patent-related
costs incurred in connection with filing and prosecuting patent applications are
expensed as incurred to general and administrative expense due to the
uncertainty about the recovery of the expenditure. Employee costs include
salaries, bonuses, benefits, stock-based compensation, and other related costs,
for those employees in general and administrative functions.

We expect our general and administrative expenses will be higher in 2020 as
compared to 2019 as we incur additional costs related to the build out of our
internal general and administrative functions to support our operations, incur
costs associated with operating as a public company for the full year, and incur
additional legal costs associated with the ongoing arbitration matter.

Other Income

In 2020, we received a New York City Biotechnology Tax Credit. Tax credits are recorded when funds are received and are included in other income on the statement of operations and comprehensive loss.

Interest Income

We have institutional money market and investment accounts that pay interest on a monthly basis.



Results of Operations

Comparison of the three months ended September 30, 2020 and 2019

The following table summarizes our results of operations:





                                    Three Months Ended September 30,
                                       2020                   2019            Change
                                                    (in thousands)
    Operating Expenses:
    Research and development     $         12,321       $         16,836     $ (4,515 )

    General and administrative              6,303                  4,452   

    1,851
    Total operating expenses               18,624                 21,288       (2,664 )
    Operating loss                        (18,624 )              (21,288 )      2,664
    Interest income, net                       37                    989         (952 )
    Net loss                     $        (18,587 )     $        (20,299 )   $  1,712

Research and Development Expenses



Research and development expenses decreased by $4.5 million to $12.3 million for
the three months ended September 30, 2020 as compared to the same period in
2019. The decrease was primarily due to a $3.9 million decrease in external
manufacturing and costs due to the timing of production of clinical and
preclinical supply, a of $1.5 million decrease in direct clinical trial costs
related to delays in our PROPEL, PROVIDE, and PROCLAIM clinical trials and
startup cost on another clinical trial that has been delayed, and a $0.5 million
decrease related to external preclinical and toxicology studies. These decreases
were partially offset by a $1.4 million increase in employee-related costs,
inclusive of a $0.4 million increase in stock-based compensation expense
resulting from an increase in research and development employees hired to
execute the development of our clinical stage product candidates and preclinical
pipeline.

General and Administrative Expenses



General and administrative expenses increased by $1.9 million to $6.3 million
for the three months ended September 30, 2020 as compared to the same period in
2019. The increase was primarily due to a $1.3 million increase in employee and
related costs, inclusive of a $0.8 million increase in stock-based compensation
expense, resulting from an increase in general and administrative employees to
support our expanded operations and establish capabilities to operate as a
public company, the grant of annual equity awards to existing employees and a
$0.8 million increase in legal fees, primarily the result of legal fees incurred
on the ongoing

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arbitration matter and intellectual property patent costs. These increases were partially offset by a $0.2 million decrease in costs incurred for other professional services and facilities costs.

Interest Income, Net



Interest income decreased by $1.0 million to less than $0.1 million during the
three months ended September 30, 2020, as compared to $1.0 million during the
three months ended September 30, 2019. The decrease was primarily due to the
reductions in the federal funds interest rate earned on our cash and cash
equivalents.

Comparison of the nine months ended September 30, 2020 and 2019

The following table summarizes our results of operations:





                                     Nine Months Ended September 30,
                                       2020                   2019            Change
                                                    (in thousands)
    Operating Expenses:
    Research and development     $         36,681       $         37,202     $    (521 )

    General and administrative             23,373                 10,050   

    13,323
    Total operating expenses               60,054                 47,252        12,802
    Operating loss                        (60,054 )              (47,252 )     (12,802 )
    Other income                              210                      -           210
    Interest income, net                      582                  1,905        (1,323 )
    Net loss                     $        (59,262 )     $        (45,347 )   $ (13,915 )

Research and Development Expenses



Research and development expenses decreased by $0.5 million to $36.7 million for
the nine months ended September 30, 2020 as compared to $37.2 million for the
same period in 2019. The decrease was primarily due to a $7.2 million decrease
in external manufacturing costs due to timing of production of clinical and
preclinical supply, a $1.9 million decrease in license fees related to licenses
entered into with REGENXBIO and a $0.4 million decrease related to external
preclinical and toxicology studies. These decreases were partially offset by a
$3.0 million increase in direct clinical trial costs related to our PROPEL,
PROVIDE, and PROCLAIM clinical trials, a $4.6 million increase in
employee-related costs, inclusive of a $1.3 million increase in stock-based
compensation expense resulting from an increase in research and development
employees to execute the development of our clinical stage product candidates
and preclinical pipeline, and a $1.4 million increase in facility and lab
operating costs, due to the occupancy of an additional floor of office space in
July 2019, which was previously under renovation and being recorded to general
and administrative expenses.

General and Administrative Expenses



General and administrative expenses increased by $13.3 million to $23.4 million
for the nine months ended September 30, 2020 as compared to $10.1 million for
the same period in 2019. The increase was primarily due to an $9.1 million
increase in legal fees, primarily the result of legal fees incurred on the
ongoing arbitration matter, intellectual property costs and costs to operate as
a public company, a $3.4 million increase in employee-related costs, inclusive
of a $2.1 million increase in stock-based compensation expense, resulting from
an increase in general and administrative employee headcount to support our
expanded operations and ability to comply with public company requirements and
the classification of certain employees to general and administrative
commensurate with our IPO in June 2019, an increase of $0.9 million in director
and officer's insurance as a result of operating as a publicly traded company
and an increase in other professional service costs of $0.6 million. These
increases were partially offset by a $0.7 million decrease in facilities costs,
due to the occupancy of an additional floor of office space in July 2019, which
was previously under renovation and is now primarily recorded to research and
development expenses.

Other Income

In 2020, we received a New York City Biotechnology Tax Credit. This program
allows investors and owners of emerging technology companies focused on
biotechnology to claim a refundable tax credit for amounts paid or incurred for
certain facilities, operations and employee training in New York City. We
recognized $0.2 million of other income during the nine months ended
September 30, 2020. No such transaction occurred during the nine months ended
September 30, 2019.

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Interest Income, net

Interest income decreased by $1.3 million to $0.6 million for the nine months
ended September 30, 2020 as compared to $1.9 million during the nine months
ended September 30, 2019. The decrease was primarily due to the reductions to
the federal funds interest rate earned on our cash and cash equivalents.



Liquidity and Capital Resources



Since our inception, we have incurred significant operating losses. Our net
losses were $59.3 million and $45.3 million for the nine months ended
September 30, 2020 and 2019, respectively. As of September 30, 2020 and
December 31, 2019, we had an accumulated deficit of $143.4 million and $84.1
million, respectively. To date, we have focused primarily on organizing and
staffing our company, raising capital, establishing and protecting our
intellectual property portfolio, in-licensing the rights to AAV9 in particular
fields, developing and progressing our gene therapy product candidates through
preclinical studies and clinical trials, and establishing our manufacturing
platform. Our primary use of cash is to fund operating expenses, which consist
primarily of research and development expenditures, and to a lesser extent,
general and administrative expenditures.

We do not have any products approved for sale. We do not expect to generate any
revenue from product sales unless and until we successfully complete development
and obtain regulatory approval for one or more of our product candidates, which
we expect will take a number of years. Since our inception, we have funded our
operations primarily through equity and convertible debt financings. In March
2019, we raised an aggregate of approximately $49.8 million of net proceeds from
our Series B convertible Preferred Stock financing. In June 2019, we completed
our IPO whereby we sold an aggregate of 7,353,000 shares of our common stock for
aggregate net proceeds of approximately $113.0 million, after deducting
underwriting discounts and commissions and offering expenses payable by us of
approximately $12.0 million. In August 2020, we entered into a Sales Agreement
with Jefferies, as sales agent, pursuant to which we may offer and sell, from
time to time, through Jefferies, shares of our common stock having an aggregate
offering price of up to $75.0 million. Jefferies receives a commission of up to
3.0% of the gross proceeds from each sale of such shares. As of September 30,
2020, we have not sold any shares of our common stock pursuant to the Sales
Agreement.

As of September 30, 2020, we had cash, cash equivalents and investments of $114.3 million. Cash in excess of immediate requirements is invested in accordance with our investment policy, primarily with a view to capital preservation and liquidity.



Cash Flows

Historical Cash Flows

The following table shows a summary of our cash flows for the periods presented:



                                                     Nine Months Ended September 30,
                                                       2020                   2019             Change
                                                             (in thousands)
Net cash used in operating activities            $        (53,235 )     $        (40,955 )   $  (12,280 )
Net cash used in investing activities                     (33,222 )               (2,050 )      (31,172 )
Net cash provided by financing activities                     138                163,065       (162,927 )
Net increase (decrease) in cash, cash
equivalents and restricted cash                  $        (86,319 )     $        120,060     $ (206,379 )




Operating Activities

Cash used in operating activities for the nine months ended September 30, 2020
was $53.2 million as compared to $41.0 million for the same period in 2019. The
increase in cash used was primarily the result of increased operating expenses.
Our net loss was $59.3 million, which included non-cash charges of $6.8 million,
consisting primarily of $6.4 million of stock-based compensation expense, and
$0.4 million of depreciation, amortization and interest accretion expenses. The
change in our net operating assets was primarily the result of a $1.4 million
increase in prepaid expenses and other long-term assets. The change in net
operating assets also included a $0.6 million increase in accounts payable and
accrued expenses, along with a $1.0 million non-cash decrease in the operating
lease right-of-use asset and a net decrease in operating lease liabilities of
$1.0 million.

Comparatively, for the nine months ended September 30, 2019, our net loss was
$45.3 million, which included non-cash charges of $3.2 million, consisting
primarily of $3.0 million of stock-based compensation expense, and $0.2 million
of depreciation and amortization expense. The change in our net operating assets
was primarily the result of a $6.9 million increase in prepaid expenses and
other current assets, comprised of $4.1 million relating to our external
manufacturing services, $1.3 million for director's and

                                       26

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officer's insurance, $1.5 million relating to other external research and
development activities and allowance on facility space. In addition, the change
in net operating assets also included a $7.3 million increase in accounts
payable and accrued expenses, primarily associated with research and development
expenses, along with a $1.8 million non-cash increase in the operating lease
right-of-use-asset and an increase in operating lease liabilities of $2.5
million as a result of the July 2019 lease modification.

Investing Activities



Cash used for investing activities was $33.2 million for the nine months ended
September 30, 2020 as compared to $2.1 million for the same period in 2019. Cash
used for investing activities for the nine months ended September 30, 2020
include purchases of investments of $32.7 million and purchases of $0.5 million
of property and equipment in connection with our ongoing lab space build out.
The cash used for investing activities of $2.1 million for the nine months ended
September 30, 2019 was a result of the purchases of property and equipment in
connection with the start of the office and lab space build out.

Financing Activities



Cash provided by financing activities for the nine months ended September 30,
2020 was $0.1 million as compared to $163.1 million for the same period in 2019,
resulting from the funds received from the Series B Preferred Stock financing in
March 2019, which generated $49.8 million of net proceeds, and our IPO in June
2019, which generated $113.0 million, of net proceeds. No such financings took
place during the nine months ended September 30, 2020. Proceeds of approximately
$0.1 million were received during the nine months ended September 30, 2020 as a
result of option exercises.

Funding Requirements

We believe our existing cash, cash equivalents and investments will be
sufficient to meet our anticipated cash requirements for at least 12 months from
the issuance date of these financial statements. However, our forecast of the
period of time through which our financial resources will be adequate to support
our operations is a forward-looking statement that involves risks and
uncertainties, and actual results could vary materially. We have based this
estimate on assumptions that may prove to be wrong, and we could expend our
capital resources sooner than we expect. Additionally, the process of testing
product candidates in clinical trials is costly, and the timing of progress and
expenses in these trials is uncertain.

Our future capital requirements will depend on many factors, including:

• the scope and rate of progress of our preclinical and toxicology studies,

as well as our ongoing and any future clinical trials;

• the scope and costs of manufacturing study materials and manufacturing

process development, both internally and externally, and related clinical

manufacturing activities;

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

• the costs of preparing, filing and prosecuting patent applications,

maintaining and enforcing our intellectual property rights and defending

intellectual property-related claims;

• the terms and timing of establishing and maintaining collaborations,

licenses and other similar arrangements;

• our efforts to enhance operational systems and our ability to attract,


        hire and retain qualified personnel, including personnel to support the
        development of our product candidates;


  • the costs associated with being a public company;


• the results and costs of any litigation or other legal proceedings to

which we or our officers or directors may be a party;

• the timing of any milestone and royalty payments to current and future

licensors, if any;

• the extent to which we acquire or in-license other best-in-class AAV-based

viral vectors, product candidates or technologies; and

• the cost associated with commercializing any product candidates, if and

when they receive marketing approval.




Until such time, if ever, as we can generate substantial product revenues to
support our cost structure, we expect to finance our cash needs through a
combination of equity offerings, debt financings, collaborations and other
similar arrangements. To the extent that we raise additional capital through the
sale of equity or convertible debt securities, the ownership interest of our
stockholders will be or

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could be diluted, and the terms of these securities may include liquidation or
other preferences that adversely affect the rights of our common stockholders.
Debt financing and equity financing, if available, may involve agreements that
include covenants limiting or restricting our ability to take specific actions,
such as incurring additional debt, making capital expenditures or declaring
dividends. If we raise funds through collaborations, or other similar
arrangements with third parties, we may have to relinquish valuable rights to
our technologies, future revenue streams, research programs or product
candidates or grant licenses on terms that may not be favorable to us and/or may
reduce the value of our common stock. In addition, our ability to raise
necessary financing could be impacted by the COVID-19 pandemic and its effects
on the market conditions. If we are unable to raise additional funds through
equity or debt financings when needed, we may be required to delay, limit,
reduce or terminate our product development or future commercialization efforts
or grant rights to develop and market our product candidates even if we would
otherwise prefer to develop and market such product candidates ourselves or
potentially discontinue operations.



Critical Accounting Policies and Significant Judgments and Estimates



The preparation of our financial statements in conformity with accounting
principles generally accepted in the U.S. requires us to make estimates and
judgments that affect the amounts reported in those financial statements and
accompanying notes. Although we believe that the estimates we use are
reasonable, due to the inherent uncertainty involved in making those estimates,
actual results reported in future periods could differ from those estimates.

We believe that the accounting policies described below involve a high degree of
judgment and complexity. Accordingly, these are the policies we believe are the
most critical to aid in fully understanding and evaluating our financial
condition and results of our operations.

Research and Development Costs, Accrued Research and Development Costs and Related Prepaid Expenses



Research and development costs are expensed as incurred. Research and
development expenses consist principally of personnel costs, including salaries,
stock-based compensation, and benefits for employees, third-party license fees
and other operational costs related to our research and development activities,
including allocated facility-related expenses and external costs of outside
vendors, and other direct and indirect costs. Research and development advance
payments are deferred and capitalized. The capitalized amounts are expensed as
the related goods are delivered or services are performed.

Clinical trial costs are accrued over the service periods specified in the
contracts and adjusted as necessary based on an ongoing review of the level of
effort and costs actually incurred. The estimate of the work completed is
developed through discussions with internal personnel and external service
providers as to the progress of stage of completion of the services and the
agreed-upon fee to be paid for such services. As actual costs become known, the
accrued estimates are adjusted. Such estimates are not expected to be materially
different from amounts actually incurred, however our understanding of the
status and timing of services performed, the number of subjects enrolled, and
the rate of subject enrollment may vary from estimates and could result in
reporting amounts that are higher or lower than incurred in any particular
period. The estimate of accrued research and development expense is dependent,
in part, upon the receipt of timely and accurate reporting from clinical
research organizations and other third-party service providers.

Leases

We determine if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use, or ROU, assets, operating lease liabilities, and long-term operating lease liabilities in our balance sheets.



ROU assets represent 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. Operating lease ROU assets and liabilities are recognized at
commencement date based on the present value of lease payments over the lease
term. As our leases do not provide a readily determinable implicit rate, we use
our incremental borrowing rate based on the information available at
commencement date in determining the present value of lease payments. The
operating lease ROU asset also includes any lease prepayments, offset by lease
incentives.

Our facilities operating leases have lease and non-lease components for which we
have elected to apply the practical expedient and account for each lease
component and related non-lease component as one single component. Operating
lease cost is recognized on a straight-line basis over the lease term.

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Stock-Based Compensation

We measure all stock options and other stock-based awards granted to our
employees, directors, consultants and other non-employee service providers based
on the fair value on the date of the grant, and we recognize compensation
expense of those awards over the requisite service period, which is generally
the vesting period of the respective award. We recognize forfeitures at the time
forfeitures occur.

We classify stock-based compensation expense in our statement of operations and
comprehensive loss in the same way the award recipient's payroll costs are
classified or in which the award recipients' service payments are classified. We
use the Black-Scholes option-pricing model to estimate the fair value of stock
options on the date of grant. Using the Black-Scholes option-pricing model
requires management to make significant assumptions and judgments, including
with respect to the expected term of the option, risk-free interest rate,
stock-price volatility and dividend yield. In addition, prior to the IPO, the
fair value of the shares of common stock underlying our stock-based awards was
determined by our board of directors with input from management and
contemporaneous third-party valuations. Given the absence of a public trading
market for our common stock prior to the IPO, our board of directors considered
a number of objective and subjective factors to determine the best estimate of
the fair value of our common stock, including but not limited to the prices of
common or convertible preferred stock sold to third-party investors by us and in
secondary transactions or repurchased by us in arms-length transactions, lack of
marketability of our common stock, our actual operating and financial
performance, current business conditions and projections, the history of our
company, hiring of key personnel and the experience of our management, our stage
of development, the market performance of comparable publicly traded companies
and the U.S. and global capital market conditions. Subsequent to the IPO, fair
value of each share of underlying common stock is based on the closing price of
our common stock as reported by Nasdaq on the date of grant.

We use the Black-Scholes option pricing model to estimate the fair value of
stock options on the date of grant. We determined the assumptions for the
Black-Scholes option-pricing valuation model as discussed below. Each of these
inputs is subjective and generally requires significant judgment to determine.
The weighted average fair value and assumptions used to determine the fair value
of stock options granted was as follows:



                                            Three Months Ended September 30,          Nine Months Ended September 30,
                                              2020                  2019                2020                    2019
Grant date fair value                      $     13.53         $         7.22     $          16.61         $         6.19
Expected term                                      5.9                    6.0                  6.0                    6.0
Risk-free interest rate                            0.4 %                  1.4 %                1.2 %                  2.4 %
Expected volatility                               86.6 %                 81.6 %               86.1 %                 79.1 %
Dividend rate                                        -                      -                    -                      -


Income Taxes

We account for income taxes using the asset and liability method, which requires
the recognition of deferred tax assets and liabilities for the expected future
tax consequences of events that have been recognized in the financial statements
or our tax returns. Under this method, deferred tax assets and liabilities are
determined on the basis of the differences between the financial statements and
tax basis of the assets and liabilities using enacted tax rates in effect for
the year in which the differences are expected to reverse. The effect of a
change in tax rates on deferred tax assets and liabilities is recognized in
income in the period that includes the enactment date. Changes in deferred tax
assets and liabilities are recorded in the provision for income taxes.

We recognize deferred tax assets to the extent that we believe that these assets
are more likely than not to be realized. In making such a determination,
management considers all available positive and negative evidence, including
future reversals of existing taxable temporary differences, projected future
taxable income, tax-planning strategies, and results of recent operations.
Valuation allowances are provided, if based upon the weight of available
evidence, it is more likely than not that some or all of the deferred tax assets
will not be realized. If management determines that we would be able to realize
our deferred tax assets in the future in excess of their net recorded amount,
management would make an adjustment to the deferred tax asset valuation
allowance, which would reduce the provision for income taxes.

We record uncertain tax positions in accordance with ASC 740 on the basis of a
two-step process in which (1) management determines whether it is more likely
than not that the tax positions will be sustained on the basis of the technical
merits of the position and (2) for those tax positions that meet the
more-likely-than-not recognition threshold, management recognizes the largest
amount of tax benefit that is more than 50% likely to be realized upon ultimate
settlement with the related tax authority.

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We provide reserves for potential payments of tax to various tax authorities
related to uncertain tax positions. These reserves are based on a determination
of whether and how much of a tax benefit taken by us in our tax filings or
positions is more likely than not to be realized following resolution of any
potential contingencies related to the tax benefit. Potential interest related
to the underpayment of income taxes will be classified as a component of
interest expense and any related penalties will be classified in operating
expenses in the statement of operations and comprehensive loss.

Emerging Growth Company Status



In April 2012, the Jumpstart Our Business Startups Act, or the JOBS Act, was
enacted. Section 107 of the JOBS Act provides that an emerging growth company
may take advantage of the extended transition period provided in Section
7(a)(2)(B) of the Securities Act of 1933, as amended, or the Securities Act, for
complying with new or revised accounting standards. Therefore, an emerging
growth company can delay the adoption of certain accounting standards until
those standards would otherwise apply to private companies.

We have irrevocably elected not to avail ourselves of this extended transition
period and, as a result, we will adopt new or revised accounting standards on
the relevant dates on which adoption of such standards is required for other
public companies.

Recently Adopted Accounting Pronouncements



Descriptions of recently issued accounting pronouncements that may potentially
impact our financial position, result of operations or cash flows are disclosed
in Note 2 to our financial statements included elsewhere in this report.

Off-Balance Sheet Arrangements

We did not have during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined by applicable SEC rules and regulations.

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