The following discussion and analysis should be read in conjunction with the
audited annual consolidated financial statements and the related notes thereto
included elsewhere in this Annual Report on Form 10-K. This discussion contains
forward-looking statements reflecting our current expectations that involve
risks and uncertainties. Actual results may differ materially from those
discussed in these forward-looking statements due to a number of factors,
including those set forth in the section entitled "Risk Factors" and elsewhere
in this Annual Report on Form 10-K. For further information regarding
forward-looking statements, please refer to the special note regarding
forward-looking statements at the beginning of this Annual Report on Form 10-K.
Throughout this discussion, unless the context specifies or implies otherwise,
the terms "Company," "we," "us" and "our" refer to Omeros Corporation and our
wholly owned subsidiaries.

Overview

We are a commercial-stage biopharmaceutical company committed to discovering, developing and commercializing small-molecule and protein therapeutics for large-market as well as orphan indications targeting inflammation, complement-mediated diseases, disorders of the central nervous system, and immune-related diseases, including cancers.


Our drug product OMIDRIA® is marketed in the United States for use during
cataract surgery or intraocular lens replacement for adult and pediatric
patients. Our drug candidate narsoplimab is the subject of a rolling biologics
license application ("BLA") under priority review by the U.S. Food and Drug
Administration ("FDA") for the treatment of hematopoietic stem cell
transplant-associated thrombotic microangiopathy ("HSCT-TMA"). We also have
multiple Phase 3 and Phase 2 clinical-stage development programs in our
pipeline, which are focused on: complement-mediated disorders, including
immunoglobulin A ("IgA") nephropathy, atypical hemolytic uremic syndrome
("aHUS"), and COVID-19. We have also initiated a Phase 1 clinical program for
our MASP-3 inhibitor OMS906 targeting the alternative pathway of complement and
have successfully completed a Phase 1 study in our phosphodiesterase 7 ("PDE7")
program focused on addiction. In addition, we have a diverse group of
preclinical programs, including GPR174, a novel target in immuno-oncology that
modulates a new cancer immunity axis that we discovered. Small-molecule and
antibody inhibitors of GPR174 are part of our proprietary G protein-coupled
receptor ("GPCR") platform through which we control 54 GPCR drug targets and
their corresponding compounds. We also possess a proprietary-asset-enabled
antibody-generating technology. We have retained control of all commercial
rights for OMIDRIA and each of our product candidates and programs.

Financial Summary

We recognized net losses of $138.1 million, $84.5 million, and $126.8 million for the years ended December 31, 2020, 2019 and 2018, respectively and our OMIDRIA revenues were $73.8 million, $111.8 million, and $29.9 million



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respectively. Historically, OMIDRIA revenues were impacted by the reimbursement status for OMIDRIA under Medicare Part B, as well as the COVID-19 pandemic.



                           [[Image Removed: Graphic]]


                         * Fiscal quarters without pass-through reimbursement
                        ** Fiscal quarters with reduced cataract procedures due
                           to COVID-19
                       *** Pass-through reimbursement expired on October 1,
                           2020. In December 2020, separate payment was
                           confirmed for OMIDRIA, effective retroactively as of
                           October 1, 2020.




During the period from January 1, 2018 to September 30, 2018, OMIDRIA was not
reimbursed separately when used for procedures involving patients covered by
Medicare Part B, and our revenues decreased significantly. After reinstatement
of pass-through reimbursement for OMIDRIA in the fourth quarter of 2018, our
revenues quickly returned to levels seen in prior periods during which
pass-through reimbursement was available and subsequent quarter-over-quarter
revenue growth approximated historical rates. Pass-through status for OMIDRIA
allowed for separate reimbursement payment (i.e., outside the packaged
procedural payment) to ASCs and hospitals using OMIDRIA in procedures involving
patients covered by Medicare Part B.

Pass-through reimbursement for OMIDRIA under Medicare Part B expired on October
1, 2020, and consequently, our net revenues for September and the fourth quarter
of 2020 were significantly reduced. In December 2020, the Centers for Medicare &
Medicaid Services ("CMS") confirmed that OMIDRIA, as an otherwise policy
packaged drug following OMIDRIA's expiration of pass-through status on October
1, 2020, qualifies for separate payment when used on Medicare Part B patients in
the ambulatory surgery center ("ASC") setting under CMS' policy for non-opioid
pain management surgical drugs. CMS made separate payment for OMIDRIA under this
policy effective retroactively as of October 1, 2020. CMS' non-opioid separate
payment policy and, as a result, separate payment for OMIDRIA thereunder, like
other CMS policies in the OPPS and ASC systems, can be changed by CMS through
its annual rulemaking and comment process for its outpatient prospective payment
and ASC payment systems. We believe that CMS will continue its separate payment
policy for non-opioid pain management surgical drugs, which has been in effect
since 2019, and that OMIDRIA will continue to be separately reimbursed when used
in the ASC setting.

See Part 1, Item 1, "Business-Commercial Product-OMIDRIA" for additional details regarding the pass-through reimbursement status for OMIDRIA.



We expect our net losses will continue until such time as we derive sufficient
revenues from sales of OMIDRIA and/or other sources, such as licensing, product
sales and other revenues from our product candidates, that are sufficient to
cover our operating expenses and debt service obligations.

As of December 31, 2020, we had $135.0 million in cash and cash equivalents and
short-term investments available for general corporate use and $3.8 million

in
accounts receivable, net.

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Results of Operations

Revenue

Our revenue consists of OMIDRIA product sales to ASCs, and hospitals in the U.S. Our product sales, net are as follows:




                        Year Ended December 31,
                       2020        2019       2018

                             (In thousands)
Product sales, net $  73,813   $ 111,805   $ 29,868

We launched OMIDRIA in the U.S. in the second quarter of 2015 and sell OMIDRIA primarily through wholesalers which, in turn, sell to ASCs and hospitals.



In 2020, OMIDRIA revenue decreased $38.0 million, or 34%, as compared to the
year ended December 31, 2019. The decrease in revenue during 2020 compared to
2019 was due to COVID-19-related reductions in the number of elective cataract
procedures from mid-March 2020 through late June 2020. The additional decrease
in revenue during 2020 compared to 2019 was due to a slowdown in orders from
wholesalers during September and the fourth quarter following expiration of
pass-through reimbursement for OMIDRIA on October 1, 2020. In December 2020, CMS
confirmed that OMIDRIA qualifies for separate payment when used in the ASC
setting.

In 2019, OMIDRIA revenue increased $81.9 million, or 274%, as compared to the
year ended December 31, 2018. The increase in revenue in 2019 compared to 2018
was due to significantly increased demand for OMIDRIA by ASCs and hospitals
following the reinstatement of pass-through reimbursement status for OMIDRIA on
October 1, 2018.

During the nine-month period from January 1, 2018 to September 30, 2018, OMIDRIA was not reimbursed separately when used for procedures involving patients covered by Medicare Part B.



Given the uncertainty and local variances in the severity and response to the
COVID-19 pandemic across the U.S., and whether CMS will continue its separate
payment policy for non-opioid pain management surgical drugs, which has been in
effect since 2019, we may experience significant fluctuations in
period-over-period OMIDRIA revenues.

Gross-to-Net Deductions



We record OMIDRIA product sales net of estimated chargebacks, rebates,
distribution fees and product returns. These deductions are generally referred
to as gross-to-net deductions. Our total gross-to-net provisions for the years
ended December 31, 2020, 2019 and 2018 were 31.2%, 27.7% and 28.1%,
respectively, of gross OMIDRIA product sales.

Our gross-to-net provision and payments for the years ended December 31, 2020, 2019 and 2018 are summarized below:




                                                     Distribution
                                                       Fees and
                                                       Product
                                    Chargebacks         Return
                                    and Rebates       Allowances        Total

                                                  (In thousands)
Balance as of December 31, 2017    $       5,724    $        3,373    $    9,097
Provisions                                10,341             1,309        11,650
Payments                                 (9,050)           (3,197)      (12,247)

Balance as of December 31, 2018            7,015             1,485        

8,500
Provisions                                37,232             5,387        42,619
Payments                                (34,007)           (4,635)      (38,642)
Balance as of December 31, 2019           10,240             2,237        12,477
Provisions                                25,639             7,764        33,403
Payments                                (32,139)           (9,053)      (41,192)
Balance as of December 31, 2020    $       3,740    $          948    $    4,688


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Chargebacks and Rebates

We record a provision for estimated chargebacks and rebates at the time we
recognize OMIDRIA product sales revenue and reduce the accrual when payments are
made or credits are granted. Our chargebacks are related to a pharmaceutical
pricing agreement, a federal supply schedule agreement, a 340B prime vendor
agreement, a Medicaid drug rebate agreement and an off-invoice discount to our
customers. We also record a provision for our OMIDRIAssure® patient assistance
and reimbursement services program and our rebates under our purchase
volume-discount programs.

Distribution Fees and Product Return Allowances


We pay our wholesalers a distribution fee for services they perform for us based
on the dollar value of their purchases of OMIDRIA. We record a provision for
these charges as a reduction to revenue at the time of sale to the wholesaler
and make payments to our wholesalers based on contractual terms.

We allow for the return of product up to 12 months past its expiration date, or
for product that is damaged or not used by our customers. We record a provision
for returns upon sale of OMIDRIA to our wholesaler. When a return or claim is
received, we issue a credit memo to the wholesaler against its outstanding
receivable to us or we reimburse the customer.

Research and Development Expenses


Our research and development expenses can be divided into three categories:
direct external expenses, which include clinical research and development and
preclinical research and development activities; internal, overhead and other
expenses; and stock-based compensation expense. Direct external expenses consist
primarily of expenses incurred pursuant to agreements with third-party
manufacturing organizations prior to receiving regulatory approval for a product
candidate, contract research organizations ("CROs"), clinical trial sites,
collaborators, and licensors and consultants. Costs are reported in preclinical
research and development until the program enters the clinic. Internal, overhead
and other expenses consist of personnel costs, overhead costs such as rent,
utilities and depreciation and other miscellaneous costs. We do not generally
allocate our internal resources, employees and infrastructure to any individual
research project because we deploy them across multiple clinical and preclinical
projects that we are advancing in parallel.

The following table illustrates our expenses associated with these activities:


                                              Year Ended December 31,
                                            2020        2019        2018

                                                   (In thousands)
Direct external expenses:
Clinical research and development:
MASP-2 program - OMS721 (narsoplimab)     $  45,020   $  49,804   $ 46,383
MASP-3 program - OMS906                       7,172           -          -
OMIDRIA - Ophthalmology                       2,053       2,679      2,388
PDE7 - OMS527                                 1,833       4,066      3,586

Total clinical research and development 56,078 56,549 52,357 Preclinical research and development 10,664 14,410 6,465 Total direct external expenses

               66,742      70,959     58,822

Internal, overhead and other expenses 37,744 32,642 26,077 Stock-based compensation expense

              6,331       6,095      4,961
Total research and development expenses   $ 110,817   $ 109,696   $ 89,860


Clinical research and development expenses decreased by $0.5 million between
2020 and 2019 due to timing of narsoplimab drug manufacturing activities and
reduced OMS527 toxicology spending. During 2020, OMS906 clinical research and
development expenses were $7.2 million, and embedded within pre-clinical
research and development costs

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were $3.5 million of OMS906-related expenditures. These total expenditures of $10.7 million represent an increase of $1.8 million over the prior year.



The decrease in preclinical research and development expenses in 2020 compared
to 2019 is primarily due to the migration of OMS906 from preclinical to clinical
research and development beginning in the third quarter of 2020.

The increases in internal, overhead and other expenses in all years presented
are primarily due to additional employee-related costs and buildout of expanded
laboratory facilities in 2020 to support our research and development
activities.

We expect overall research and development costs to increase in 2021 as we
continue our ongoing Phase 3 clinical programs for narsoplimab and manufacture
commercial drug substance in anticipation of the drug's FDA approval for the
treatment of HSCT-TMA. Our accounting policy is to expense all manufacturing
costs incurred until regulatory approval is obtained in either the U.S. or
Europe.

At this time, we are unable to estimate with certainty the longer-term costs we
will incur in the continued development of our product candidates due to the
inherently unpredictable nature of our preclinical and clinical development
activities as well as the potential impact of the COVID-19 pandemic. Clinical
development timelines, the probability of success and development costs can
differ materially as new data become available and as expectations change. Our
future research and development expenses will depend, in part, on the
preclinical or clinical success of each product candidate as well as ongoing
assessments of each program's commercial potential. In addition, we cannot
forecast with precision which product candidates, if any, may be subject to
future collaborations, when such arrangements will be secured, if at all, and to
what degree such arrangements would affect our development plans and capital
requirements.

We are required to expend substantial resources in the development of our
product candidates due to the lengthy process of completing clinical trials and
seeking regulatory approval. Any failure or delay in completing clinical trials,
or in obtaining regulatory approvals, could delay our generation of product
revenue and increase our research and development expenses.

Selling, General and Administrative Expenses


Our selling, general and administrative expenses are comprised primarily of
salaries, benefits and stock-compensation costs for sales, marketing and other
personnel who are not directly engaged in research and development. Costs also
include marketing and selling expenses, professional and legal services, general
corporate costs and an allocation of our occupancy costs.


                                                        Year Ended December 31,
                                                     2020         2019         2018

                                                             (In thousands)
Selling, general and administrative expenses,
excluding stock-based compensation expense         $  64,101    $  56,936    $  44,966
Stock-based compensation expense                       8,594        7,690  

6,752


Total selling, general and administrative
expenses                                           $  72,695    $  64,626

$ 51,718




The increase in selling, general and administrative expenses, excluding
stock-based compensation during both years ended December 31, 2020 and 2019 was
primarily due to increased pre-commercialization activities for narsoplimab for
the treatment of HSCT-TMA.

We expect that our selling, general and administrative expenses in 2021 will
increase from 2020, primarily due to planned U.S. commercialization activities
related to narsoplimab.

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Interest Expense



                        Year Ended December 31,
                      2020        2019        2018

                             (In thousands)
Interest expense    $ 26,751    $ 22,657    $ 16,252


Interest expense is primarily comprised of contractual interest and amortization
of debt issuance and debt discount related to our 6.25% Convertible Senior Notes
(the "2023 Notes") and 5.25% Convertible Senior Notes (the "2026 Notes") as well
as interest on our finance leases. Non-cash interest expense for 2020, 2019 and
2018 was $11.6 million, $9.2 million and $5.6 million, respectively. Interest
expense increased for each of these periods due to increases in total debt
outstanding for each period. For more information regarding our debt and our
unsecured convertible notes, see Part II, Item 8, "Note 7-Debt" and
"Note 8-Unsecured Convertible Senior Notes" to our Consolidated Financial
Statements in this Annual Report on Form 10-K.

Loss on Early Extinguishment of Debt




                                            Year Ended December 31,
                                           2020         2019       2018

                                                 (In thousands)

Loss on early extinguishment of debt $ 13,374 $ - $ 12,993

In August and September 2020, we issued the 2026 Notes and repurchased $115.0 million of our 2023 Notes. We recorded a $13.4 million loss on early extinguishment of debt related to expensing the unamortized discount and issuance costs associated with the repurchased 2023 Notes.

In November 2018, we issued the 2023 Notes and repaid all previously outstanding loan amounts. We incurred a loss on early extinguishment of debt of $13.0 million associated with the unamortized lender facility fee, debt issuance costs, debt discount and prepayment fees in connection with the repayment.



Other Income


                   Year Ended December 31,
                 2020         2019       2018

                        (In thousands)
Other income    $   654     $  1,553    $ 1,781


Other income principally includes sublease rental income and interest earned on
our cash and investments. The variations between years is primarily due to $0.8
million of expenses incurred in 2020 in connection with terminating the portion
of the capped call related to the 2023 Notes that we repurchased.

Income Tax Benefit



                          Year Ended December 31,
                         2020         2019       2018

                               (In thousands)
Income tax benefit    $    12,011     $   -    $ 12,929




The income tax benefit in 2020 and 2018 is related to the issuance of the 2026
and 2023 Notes, respectively. See Part II, Item 8, "Note 13-Income Taxes" for
additional information.

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Financial Condition - Liquidity and Capital Resources



As of December 31, 2020, we had $135.0 million in cash, cash equivalents and
short-term investments available for general corporate use held primarily in
money-market accounts as compared to $60.8 million at December 31, 2019. We have
historically generated net losses and incurred negative cash flows. For the year
ended December 31, 2020, we incurred net losses of $138.1 million and incurred
negative cash flows from operations of $100.1 million. The net loss and the
negative cash flows from operations were significantly affected by (1) reduced
OMIDRIA revenues due to uncertainties regarding the reimbursement status of
OMIDRIA following expiration of the drug's pass-through status and associated
separate payment by CMS on October 1, 2020 and (2) the impact of COVID-19 on the
number of cataract surgeries performed nationally.

In December 2020, CMS confirmed that OMIDRIA qualifies for separate payment when
used in the ASC setting. See Part 1, Item 1, "Business-Commercial
Product-OMIDRIA" for additional details regarding the reimbursement status for
OMIDRIA.

FDA accepted our BLA for narsoplimab in HSCT-TMA for priority review and has
indicated a Prescription Drug User Fee Act ("PDUFA") date of July 17, 2021. We
expect to launch narsoplimab commercially for HSCT-TMA in the U.S. very soon
following FDA approval, and preparations to execute our sales and marketing
strategies for launch are underway. These plans include various milestones at
which we commit to incremental activities, such as field sales hiring, and
provide for flexibility in the timing of costs incurred should the approval of
narsoplimab occur in advance or after the current PDUFA date. If warranted, we
will adjust the timing and associated costs of our HSCT-TMA launch activities as
we advance through the BLA review and approval process.

We plan to continue to fund our operations for at least the next twelve months
with our cash and investments on hand, from sales of OMIDRIA and, if FDA
approval is granted, from sales of narsoplimab for HSCT-TMA. There is also the
possibility that narsoplimab will generate revenues in the treatment of
COVID-19. In addition, we may utilize funds available under our accounts
receivable-based line of credit, which allows us to borrow up to 85% of our
available accounts receivable borrowing base less certain reserves or $50.0
million, whichever is less. We may also sell shares of our common stock through
our "at the market" equity offering program. For additional information
regarding this program, see Part II, Item 9B, "Other Information." Should it be
necessary or determined to be strategically advantageous, we also could pursue
debt financings, public and private offerings of our equity securities similar
to those we have completed previously, or other strategic transactions, which
may include licensing all or a portion of any of our existing technologies.
Should it be necessary to manage our operating expenses, we would reduce our
projected cash requirements through reduction of our expenses by delaying
clinical trials, reducing selected research and development efforts, or
implementing other restructuring activities.

Cash Flow Data


                                       Year Ended December 31,
                                  2020           2019          2018

                                            (In thousands)
Selected cash flow data
Cash provided by (used in):
Operating activities           $ (100,086)    $ (60,073)    $ (103,737)
Investing activities           $  (67,031)    $  (3,401)    $    25,151
Financing activities           $   174,534    $   60,697    $    81,053


Operating Activities. Net cash used in operating activities increased for the
year ended December 31, 2020 by $40.0 million compared to the same period in
2019. The difference largely resulted from the $53.6 million increase in our net
loss from 2019, a $33.0 million increase in cash used in accounts payable and
accrued expense, and a $3.6 million increase in cash used for prepaid and other
assets. These uses were partially offset by a $43.7 million increase in cash
provided from collections of accounts receivable and an increase in non-cash
charges of $5.6 million.

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Net cash used in operating activities decreased for the year ended December 31,
2019 by $43.7 million as compared to the same period in 2018. The decrease
largely resulted from the $42.3 million decrease in our net loss from 2018 due
to an increase in OMIDRIA product sales of $81.9 million, partially offset by a
$33.1 million increase in total cost and expenses. In addition, increases in
non-cash charges of $6.1 million in 2019 compared to 2018 also positively
impacted the change in our cash used in operating activities. The net change in
operating assets and liabilities of $5.1 million also reduced our net cash used
in operations for the year ended December 31, 2019 compared to the same period
in 2018.

Investing Activities. Cash flows from investing activities primarily reflect
cash used to purchase short-term investments and proceeds from the sale of
short-term investments, thus causing a shift between our cash and cash
equivalents and short-term investment balances. Because we manage our cash usage
with respect to our cash, cash equivalents and short-term investments, we do not
consider the fluctuations in cash flows from investing activities to be
important to the understanding of our liquidity and capital resources.

Net cash used in investing activities during 2020 was $67.0 million, an increase
of $63.6 million from the $3.4 million net cash used in investing activities for
the same period in 2019, driven by an increase in purchases of investments of
$133.2 million offset by proceeds from sale and maturities of investments of
$66.4 million.

Net cash used investing activities during 2019 was $3.4 million, a decrease of
$28.6 million from the $25.2 million net cash provided by investing activities
for the same period in 2018. The net change in our investments sold compared to
purchased decreased by $28.8 million providing cash to fund our operations.

Financing Activities. Net cash provided by financing activities in the year
ended December 31, 2020 was $174.5 million, a net increase of $113.8 million
over the same period in 2019. The increase compared to the prior year was due to
receiving cash proceeds of $76.9 million, net, from the issuance of our 2026
Notes, which includes the payments for partial repurchase of our 2023 Notes,
payments for debt issuance costs, proceeds from termination of our 2023 capped
call, and purchases of capped calls related to our 2026 Notes. In addition, we
received net proceeds of $93.7 million from our August 2020 public offering of
our common stock.

Net cash provided by financing activities in the year ended December 31, 2019
was $60.7 million, a net decrease of $20.4 million over the same period in 2018,
In December 2019, we received $54.2 million net proceeds from a public offering
of our common stock.

Convertible Notes

For more information regarding the 2023 and 2026 Notes, see Part II, Item 8, "Note 8-Unsecured Convertible Senior Notes" to our Consolidated Financial Statements in this Annual Report on Form 10-K.

Line of Credit


We have a Line of Credit Agreement, under which we may draw, on a revolving
basis, up to the lesser of $50.0 million and 85.0% of our eligible accounts
receivable, less certain reserves. The Line of Credit Agreement is secured by
all our assets excluding intellectual property and development program
inventories and matures on August 2, 2022. As of December 31, 2020, we had no
outstanding borrowings under the Line of Credit Agreement and we were in
compliance with all covenants. For more information regarding the Line of Credit
Agreement, see Part II, Item 8, "Note 7-Debt" to our Consolidated Financial
Statements in this Annual Report on Form 10-K.

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Contractual Obligations and Commitments

The following table presents a summary of our contractual obligations and commitments as of December 31, 2020.




                                                                 Payments Due Within
                                                                                    More than
                                            1 Year     2-3 Years      4-5 Years      5 Years        Total

                                                                    (In thousands)
Operating leases                           $  6,536    $   13,501    $    13,970    $   12,593    $  46,600

Finance leases (principal and interest)       1,205           771             30             -        2,006
Unsecured convertible senior notes                -        95,000              -       225,030      320,030
Goods & services                             11,042        20,979          

 123             -       32,144
Total                                      $ 18,783    $  130,251    $    14,123    $  237,623    $ 400,780

Operating Leases



We lease our office and laboratory space in The Omeros Building under a lease
agreement with BMR - 201 Elliott Avenue LLC. The initial term of the lease ends
in November 2027 and we have two options to extend the lease term, each by
five years. We lease office and laboratory equipment under various operating and
finance lease agreements with initial terms of five years or less. As of
December 31, 2020, the remaining aggregate non-cancelable rent payable under the
initial term of the lease, excluding common area maintenance and related
operating expenses, is $46.6 million.

Convertible Notes

Refer to "Financial Condition-Liquidity and Capital Resources-Convertible Notes" above.



Goods & Services

We have certain non-cancelable obligations under other agreements for the acquisitions of goods and services associated with the manufacturing of our product candidates, which contain firm commitments. As of December 31, 2020, our aggregate firm commitments are $32.1 million.



We may be required, in connection with in-licensing or asset acquisition
agreements, to make certain royalty and milestone payments and we cannot, at
this time, determine when or if the related milestones will be achieved or
whether the events triggering the commencement of payment obligations will
occur. Therefore, such payments are not included in the table above. For
information regarding agreements that include these royalty and milestone
payment obligations, see Part II, Item 8, "Note 10-Commitments and
Contingencies" to our Consolidated Financial Statements in this Annual Report on
Form 10-K.

Critical Accounting Policies and Significant Judgments and Estimates



The preparation of our consolidated financial statements, in conformity with
U.S. generally accepted accounting principles ("GAAP"), requires management to
make estimates and assumptions that affect the amounts reported in the financial
statements and accompanying notes. We base our estimates on historical
experience and on various other factors that we believe are reasonable under the
circumstances; however, actual results could differ from those estimates. An
accounting policy is considered critical if it is important to a company's
financial condition and results of operations and if it requires the exercise of
significant judgment and the use of estimates on the part of management in its
application. Although we believe that our judgments and estimates are
appropriate, actual results may differ materially from our estimates. For a
summary of our critical accounting policies, See Part II, Item 8, "Note
2-Significant Accounting Policies" to our Consolidated Financial Statements in
this Annual Report on Form 10-K.

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We believe the following to be our critical accounting policies because they are
both important to the portrayal of our financial condition and results of
operations and they require critical judgment by management and estimates about
matters that are uncertain:

 ? revenue recognition;

? research and development expenses, primarily related to the manufacturing of

drug product;

? accounting for lease agreements, primarily related to our computation of

incremental borrowing rate;

? accounting for convertible debt issuances, primarily related to fair valuing

debt and issuance costs; and

? stock-based compensation, primarily related to our fair value assumptions.

If actual results or events differ materially from those contemplated by us in making these estimates, our reported financial condition and results of operations for future periods could be materially affected.

Revenue Recognition


Product Sales, Net: We typically record revenue from product sales when the
product is delivered to our wholesalers which is generally when we satisfy all
performance obligations. Product sales are recorded net of wholesaler
distribution fees and estimated chargebacks, rebates, returns and
purchase-volume discounts. Accruals or allowances are established for these
deductions in the same period when revenue is recognized, and actual amounts
incurred are offset against the applicable accruals or allowances. We reflect
each of these accruals or allowances as either a reduction in the related
accounts receivable or as an accrued liability depending on how the amount is
expected to be settled.

Chargebacks and Rebates: Provisions for chargebacks are determined utilizing
historical and projected payer mix and information regarding sell-through and
inventory on-hand received directly from wholesalers. Chargebacks are generally
settled within four weeks of recording product sales revenue.

We provide reimbursement support services and financial assistance in the form
of a rebate to patients whose commercial insurance is inadequate to cover the
full cost of OMIDRIA. We apply an experience ratio based on historical and
projected patient claims. This experience ratio is applied to product sales to
determine the patient rebate accrual and is reviewed and updated periodically to
reflect actual results.

We provide rebate payments for which ASCs qualify by meeting or exceeding
purchase volumes of OMIDRIA under our purchase volume-discount program. We
calculate rebate payment amounts due under this program based on actual
qualifying purchase volumes and apply a contractual discount rate. For purchases
of OMIDRIA not yet reported as sold-through to the ASC by our wholesalers, we
apply an experience ratio to product sales to determine the rebate accrual. This
experience ratio is reviewed and updated periodically to reflect actual results.

Distribution Fees and Product Return Allowances: We pay our wholesalers a
distribution fee for services that they perform for us based on the wholesaler
average cost value of their purchases of OMIDRIA. We record a provision against
product sales for these charges at the time of sale to the wholesaler.

We allow for the return of product up to 12 months past its expiration date or
for product that is damaged. In estimating product returns, we take into
consideration our return experience to date, the remaining shelf-life of product
we have previously sold, inventory in the wholesale channel and our expectation
that product is typically not held by the health care providers based on the
frequency of their reorders.

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Research and Development Expenses

Research and development costs are comprised primarily of:

? contracted research and manufacturing costs;

? clinical study costs;

? costs of personnel, including salaries, benefits and stock compensation;

? consulting arrangements;

? depreciation and an allocation of our occupancy costs; and

? other expenses incurred to sustain our overall research and development

programs.




Contracted research and manufacturing costs are primarily incurred in the
development and production of our drug substance and drug product candidates.
Prior to approval, our estimates are based on the timing of services provided.
We record accrued expenses equal to our estimated expense in excess of amount
invoiced by the suppliers.

Clinical trial expenses are estimated on a cost per patient that varies
depending on the clinical trial site. As actual costs become known to us, we
adjust our estimates; these changes in estimates may result in understated or
overstated expenses at any given point in time.

Right-of-Use Assets and Related Lease Liabilities



On January 1, 2019, we adopted Accounting Standards Update (ASU)
2016-02, Leases, (Topic 842) using a modified retrospective approach versus
recasting the prior periods presented. For a summary of the adoption of this
critical accounting policies, See Part II, Item 8, "Note 2-Significant
Accounting Policies" to our Consolidated Financial Statements in this Annual
Report on Form 10-K.

We record operating leases on our Consolidated Balance Sheet as right-of-use
assets and recognize the related lease liabilities equal to the fair value of
the lease payments using our incremental borrowing rate when the implicit rate
in the lease agreement is not readily available. We derived our incremental
borrowing rate by assessing rates in recent market transactions, as adjusted for
security interests and our credit quality. A change in the calculated
incremental borrowing rate of 100 basis points would not be material to our
consolidated financial statements.

Stock-Based Compensation


Stock-based compensation expense is recognized for all share-based payments made
to employees, directors and non-employees based on estimated fair values. The
fair value of our stock options is calculated using the Black-Scholes option
valuation model, which requires assumptions, including volatility, forfeiture
rates and expected option life. We estimate forfeitures for expense recognition
based on our historical experience. Groups of employees that have similar
historical forfeiture behavior are considered separately. If any of the
assumptions used in the Black-Scholes model change significantly, stock-based
compensation expense for new awards may differ materially from that recorded for
existing awards and stock-based compensation for non-employees will vary as the
awards are re-measured over the vesting term.

Recent Accounting Pronouncements


Please refer to Part II, Item 8, "Note 2--Significant Accounting Policies" to
our Consolidated Financial Statements in this Annual Report in Form 10-K for
information regarding recent accounting pronouncements.

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Off-Balance Sheet Arrangements

We have not engaged in any off-balance sheet arrangements.

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