You should read the following management's discussion and analysis of our
financial condition and results of operations in conjunction with our unaudited
condensed consolidated financial statements and notes thereto included in Part
I, Item 1 of this Quarterly Report on Form 10-Q (Quarterly Report) and with our
audited consolidated financial statements and notes thereto for the year ended
December 31, 2019, included in our Annual Report on Form 10-K filed with the
U.S. Securities and Exchange Commission (SEC) on February 25, 2020.

Special note regarding forward-looking statements



This report contains forward-looking statements that involve risks and
uncertainties. Our actual results could differ materially from those discussed
in the forward-looking statements. The statements contained in this report that
are not purely historical are forward-looking statements within the meaning of
Section 27A of the Securities Act of 1933, as amended (the Securities Act), and
Section 21E of the Securities Exchange Act of 1934, as amended (the Exchange
Act). Forward-looking statements are often identified by the use of words such
as, but not limited to, "anticipate," "believe," "can," "continue," "could,"
"estimate," "expect," "intend," "may," "plan," "project," "seek," "should,"
"strategy," "target," "will," "would" and similar expressions or variations
intended to identify forward-looking statements. These statements are based on
the beliefs and assumptions of our management based on information currently
available to management. Such forward-looking statements are subject to risks,
uncertainties and other important factors that could cause actual results and
the timing of certain events to differ materially from future results expressed
or implied by such forward-looking statements. Factors that could cause or
contribute to such differences include, but are not limited to, those identified
below and those discussed in the section titled "Risk Factors" included under
Part II, Item 1A below. Furthermore, such forward-looking statements speak only
as of the date of this report. Except as required by law, we undertake no
obligation to update any forward-looking statements to reflect events or
circumstances after the date of such statements.

Overview



We are a global medical device company focused on providing innovative products
that improve the quality of life of patients suffering from chronic pain. We
have developed and commercialized the Senza spinal cord stimulation (SCS)
system, an evidence-based neuromodulation platform for the treatment of chronic
pain, and are currently in the process of launching our newest product platform,
Senza Omnia. Our proprietary paresthesia-free HF10 therapy, delivered by our
Senza system, was demonstrated in our SENZA-RCT study to be superior to
traditional SCS therapy, with HF10 therapy being nearly twice as successful in
treating back pain and 1.5 times as successful in treating leg pain when
compared to traditional SCS therapy. Comparatively, traditional SCS therapy has
limited efficacy in treating back pain and is used primarily for treating leg
pain, limiting its market adoption. Our SENZA-RCT study, along with our European
studies, represents what we believe is the most robust body of clinical evidence
for any SCS therapy. We believe the superiority of HF10 therapy over traditional
SCS therapies will allow us to capitalize on and expand the approximately
$2.4 billion existing global SCS market by treating both back and leg pain
without paresthesia.

We launched Senza commercially in the United States in May 2015, after receiving
a label from the U.S. Food and Drug Administration (FDA) supporting the
superiority of our HF10 therapy over traditional SCS. The Senza system has been
commercially available in certain European markets since November 2010 and in
Australia since August 2011. We have experienced significant revenue growth in
the United States since commercial launch. Senza is currently reimbursed by all
of the major insurance providers. In early 2017, we commenced a controlled
commercial launch of our family of surgical leads, marketed as the Surpass
surgical lead, and in April 2020 received FDA approval for our reduced-size
Surpass-C surgical lead. In January 2018, we received FDA approval of our next
generation Senza II SCS system. In the fourth quarter of 2019, we received FDA
approval of our next generation product

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platform, Senza® Omnia™, which we launched in the United States in the fourth
quarter of 2019. Additionally, we received approval to commercially launch Senza
Omnia in Europe during the second quarter of 2020 and in Australia in July 2020.
The tables below set forth our revenue from U.S. and international sales the
past nine quarters on a quarterly basis and total revenue for each of the past
five years and the six months ended June 30, 2020.



                     Q1 2018       Q2 2018       Q3 2018      Q4 2018       Q1 2019       Q2 2019      Q3 2019      Q4 2019       Q1 2020       Q2 2020
Revenue from:                                                                  (in millions)
U.S. sales          $    70.6     $    79.9     $    79.6     $   91.6     $    65.8     $    78.1     $   84.2     $   97.9     $    75.3     $    51.0
International sales      17.0          16.2          16.0         16.3          16.3          15.5         16.0         16.5          12.2           5.4
Total sales revenue $    87.6     $    96.1     $    95.6     $  107.9     $    82.1     $    93.6     $  100.2     $  114.4     $    87.5     $    56.4




                                                                                Six Months Ended
                     2015       2016        2017        2018        2019         June 30, 2020
Revenue from:                                       (in millions)
U.S. sales          $ 24.3     $ 173.3     $ 263.5     $ 321.8     $ 326.0     $            126.3
International sales   45.3        55.2        63.2        65.5        64.3                   17.6
Total sales revenue $ 69.6     $ 228.5     $ 326.7     $ 387.3     $ 390.3     $            143.9


Since our inception, we have financed our operations primarily through equity
and debt financings and borrowings under a debt facility. Our accumulated
deficit as of June 30, 2020 was $475.7 million. A significant amount of our
capital resources has been used to support the development of our Senza products
and HF10 therapy, and we have also made a significant investment building our
U.S. commercial infrastructure and sales force to support our commercialization
efforts in the United States. We intend to continue to make significant
investments in our U.S. commercial infrastructure, as well as in research and
development (R&D) to develop Senza to treat other chronic pain indications,
including conducting clinical trials to support our future regulatory
submissions. In order to further enhance our R&D efforts, pursue product
expansion opportunities or acquire a new business or products that are
complementary to our business, we may choose to raise additional funds, which
may include future equity and debt financings.

In April 2020, we issued $165.0 million aggregate principal amount of 2.75%
convertible senior notes due 2025 (the 2025 Notes) in a registered underwritten
public offering and an additional $24.8 million aggregate principal amount of
such notes pursuant to the underwriters' exercise in full of their option to
purchase additional 2025 Notes. The 2025 Notes' interest rates are fixed at
2.75% per annum and are payable semi-annually in arrears on April 1 and
October 1 of each year, commencing on October 1, 2020. The total net proceeds
from the 2025 Notes, after deducting initial purchase discounts and debt
issuance costs, were approximately $183.7 million. In connection with the
offering of the 2025 Notes, we entered into convertible note hedge transactions
in which we have the option to purchase initially (subject to adjustment for
certain specified events) a total of approximately 1.8 million shares of common
stock at a price of approximately $105.00 per share. The total cost of the
convertible note hedge transactions was $52.4 million. In addition, we sold
warrants to certain bank counterparties whereby the holders of the warrants have
the option to purchase initially (subject to adjustment for certain specified
events) a total of approximately 1.8 million shares of our common stock at a
price of $147.00 per share. We received $34.9 million in cash proceeds from the
sale of these warrants. The net cost incurred in connection with the convertible
note hedge and warrant transactions was $17.5 million. Concurrent with the
registered underwritten public offering of the 2025 Notes, we completed an
underwritten public offering of common stock and issued 1,868,750 shares of
common stock, including 243,750 shares issued pursuant to the exercise in full
of the underwriters' option to purchase additional shares. As a result of this
public offering of common stock, we received cash proceeds of $147.2 million,
net of underwriting discounts and commissions and offering costs.

We rely on third-party suppliers for all of the components of our Senza
products, and for the assembly of these systems. Several of these suppliers are
currently single-source suppliers. We have entered into and/or amended several
supply agreements in an effort to reinforce our supply chain. We are also
required to maintain high levels of inventory, and, as a result, we are subject
to the risk of inventory obsolescence and expiration, which may lead to
inventory impairment charges. In particular, we have substantially increased our
levels of inventory in order to meet our estimated demand in the United States
and, as a result, incur significant expenditures associated with such increases
in our inventory. Additionally, as compared to direct manufacturers, our
dependence on third-party manufacturers exposes us to greater lead times,
increasing our risk of inventory obsolescence.

COVID-19 Pandemic



We are subject to risks related to the public health crises such as the global
pandemic associated with COVID-19. In December 2019, a novel strain of
coronavirus, SARS-CoV-2, was reported to have surfaced in Wuhan, China. Since
then, SARS-CoV-2, and the resulting disease COVID-19, has spread to most
countries, and all 50 states within the United States. The COVID-19 outbreak has
negatively impacted, and may continue to negatively impact our operations and
revenues and overall financial condition by decreasing the number of Senza
systems procedures performed. The number of Senza systems procedures performed,
similar to other elective surgical procedures, has decreased as health care
organizations globally have prioritized the treatment of patients with COVID-19.
For

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example, in the United States, governmental authorities have recommended, and in
certain cases required, that elective, specialty and other procedures and
appointments, be suspended or canceled to avoid non-essential patient exposure
to medical environments and potential infection with COVID-19 and to focus
limited resources and personnel capacity toward the treatment of COVID-19. April
2020 was the most impacted month of the second quarter as a result of these
challenges. Since then, we have seen sequential improvements in both May and
June 2020. These measures and challenges, however, will likely continue for the
duration of the pandemic, which is uncertain, and will reduce our revenue while
the pandemic continues.

Numerous state and local jurisdictions have imposed, and others in the future
may impose, "shelter-in-place" orders, quarantines, executive orders and similar
government orders and restrictions for their residents to control the spread
of COVID-19. Starting in mid-March 2020, the governor of California, where our
headquarters are located, issued "shelter-in-place" or "stay at home" orders
restricting non-essential activities, travel and business operations for an
indefinite period of time, subject to certain exceptions for necessary
activities. Such orders or restrictions, have resulted in our headquarters
closing, work stoppages, slowdowns and delays, travel restrictions and
cancellation of events, among other effects, thereby negatively impacting our
operations. Other disruptions or potential disruptions include restrictions on
our personnel and personnel of partners to travel and access customers for
training and case support; delays in approvals by regulatory bodies; delays in
product development efforts; and additional government requirements or other
incremental mitigation efforts that may further impact our capacity to
manufacture, sell and support the use of our Senza systems.

While the potential economic impact brought by and the duration of COVID-19 may
be difficult to assess or predict, the widespread pandemic has resulted in, and
may continue to result in, significant disruption of global financial markets,
reducing our ability to access capital, which could in the future negatively
affect our liquidity, including our ability to repay our senior convertible
notes which are due in June 2021 and April 2025. The COVID-19 pandemic has also
resulted in a significant increase in unemployment in the United States which
may continue even after the pandemic. The occurrence of any such events may lead
to reduced disposable income and access to health insurance which could
adversely affect the number of Senza systems sold after the pandemic has ended.
We expect any further shelter-in-place policies and restrictions on elective
surgical procedures worldwide to have a substantial near term impact on our
revenue. We have also withdrawn our previously announced annual guidance for
2020 given the continued uncertainties resulting from the COVID-19 pandemic. In
addition, a recession or market correction resulting from the spread of COVID-19
could materially affect our business and the value of our common stock.

Important Factors Affecting our Results of Operations

In addition to the impact of COVID-19, we believe that the following factors have impacted and we expect will continue to impact our results of operations.

Importance of Physician Awareness and Acceptance of Our Products



We continue to invest in programs to educate physicians who treat chronic pain
about the advantages of Senza. This requires significant commitment by our
marketing team and sales organization, and can vary depending upon the
physician's practice specialization, personal preferences and geographic
location. Further, we are competing with well-established companies in our
industry that have strong existing relationships with many of these physicians.
Educating physicians about the advantages of our Senza products, including our
latest product, Senza Omnia, which we recently launched in the United States,
and influencing these physicians to use these products to treat chronic pain, is
required to grow our revenue.

Reimbursement and Coverage Decisions by Third-Party Payors



Healthcare providers in the United States generally rely on third-party payors,
principally federal Medicare, state Medicaid and private health insurance plans,
to cover and reimburse all or part of the cost of our products and the related
implant procedure for patients. The revenue we are able to generate from sales
of our products depends in large part on the availability of reimbursement from
such payors. While we currently have a favorable reimbursement decision from
Medicare, decisions of coverage and reimbursement for Senza and the related
implant procedure from private health insurance providers can vary. In general,
these decisions require that such payors perform analyses to determine if the
procedure is medically necessary and if our technology is covered under their
existing coverage policies. These payors may deny reimbursement if they
determine that the device or procedure was not used in accordance with the
payor's coverage policy. A significant component of our commercial efforts
includes working with private payors to ensure positive coverage and
reimbursement decisions for our products. Favorable reimbursement decisions from
Medicare and certain commercial payors, such as Aetna, Cigna, Humana, Blue Cross
Blue Shield and Kaiser, have contributed to our increase in revenue to
date. Although the largest commercial payors and Medicare cover Senza, there can
be no assurance that all private health insurance plans will cover the
product. A significant number of negative coverage and reimbursement decisions
by private insurers may impair our ability or delay our ability to grow our
revenue.

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Inventory Buildup and Supply Chain Management



Our products are composed of a substantial number of individual components and,
in order to market and sell them effectively, we must maintain high levels of
inventory. In particular, since our commercial launch of Senza in the United
States, we have continued to add suppliers to fortify our supply chain and we
have maintained increased levels of inventory. As a result, a significant amount
of our cash used in operations has been associated with the maintaining these
levels of inventory. There may also be times in which we determine that our
inventory does not meet our product requirements, as was the case for the year
ended December 31, 2019, wherein we recorded a write-down of inventory of $1.6
million. Further, the manufacturing process for our products requires lengthy
lead times, during which components may become obsolete. We may also over- or
underestimate the quantities of required components, in which case we may expend
extra resources or be constrained in the amount of end product that we can
produce. In addition, as we release later generations of products that contain
advancements or additional features, the earlier generations may become
obsolete, as was the case for the six months ended June 30, 2020, when we
recorded a charge of $2.5 million. These factors subject us to the risk of
inventory obsolescence and expiration, which may lead to inventory impairment
charges. For the year ended December 31, 2019, we additionally recorded a charge
of $3.6 million related to the cancellation of firm purchase commitments.

Investment in Research and Clinical Trials



We intend to continue investing in R&D to expand into new indications and
chronic pain conditions, as well as develop product enhancements to improve
outcomes and enhance the physician and patient experience. For example, we
commenced controlled commercial launches of Surpass, our surgical lead product
family in early 2017 and Senza II SCS System in late 2017. Most recently, we
launched our next generation product platform, Senza Omnia, in the United States
in late 2019, in Europe during the second quarter of 2020 and in Australia in
July 2020. We are continuing to invest in product improvements to Senza,
including enhanced MRI capabilities and a next generation IPG. While R&D and
clinical testing are time consuming and costly, we believe expanding into new
indications, implementing product improvements and continuing to demonstrate
HF10 efficacy, safety and cost effectiveness through clinical data are all
critical to increasing the adoption of HF10 therapy. We initiated two randomized
controlled trials in 2018, SENZA-PDN and SENZA-NSRBP, which evaluate HF10
therapy for the treatment of painful diabetic neuropathy and non-surgical
refractory back pain, respectively. In January 2020, we presented the
three-month data from our SENZA-PDN study, which was the largest SCS randomized
controlled trial conducted to date. With regard to the SENZA-NSRBP study, we
believe that we have sufficient study subjects and therefore will not require
additional enrollment.

Significant Investment in U.S. Sales Organization



We are continuing to make investments in building our U.S. commercial
infrastructure and recruiting and training our U.S. sales force. This is a
lengthy process that requires recruiting appropriate sales representatives,
establishing and, on occasion, refining a commercial infrastructure in the
United States and training our sales representatives. Following initial training
for Senza, our sales representatives typically require lead time in the field to
grow their network of accounts and produce sales results. Successfully
recruiting and training a sufficient number of productive sales representatives
has been required to achieve growth at the rate we expect.

Access to Hospital Facilities



In the United States, in order for physicians to use our products, the hospital
facilities where these physicians treat patients often require us to enter into
purchasing contracts directly with the hospital facilities or with the Group
Purchasing Organizations of which the hospital facilities are members. This
process can be lengthy and time-consuming and requires extensive negotiations
and management time. In Europe, we may be required to engage in a contract
bidding process in order to sell our products, where the bidding processes are
only open at certain periods of time, and we may not be successful in the
bidding process.

We Do Not Expect to Continue to Experience Our Historical Worldwide Revenue Growth Rates



Our worldwide revenue has increased from $18.2 million for the year ended
December 31, 2012 to $390.3 million for the year ended December 31, 2019. Since
May 2015 when we commenced the commercial launch of Senza in the U.S., our
worldwide revenue growth has been substantially driven by sales of Senza in the
United States. Over the past two years, our revenue growth in international
markets has slowed significantly. Although we had experienced significant growth
in sales in the United States for several years following our launch, we do not
expect to continue that historic rate of revenue growth in the United States or
on a worldwide basis. The COVID-19 pandemic has substantially impacted our
revenue in the first six months of 2020 and we expect continued impact in 2020
as the pandemic continues. Further, due to a number of factors, including
governmental reimbursement constraints in the European SCS market limiting the
number of annual SCS implants, market pressure in Australia and our current
penetration in these markets, we expect minimal, if any, growth in our
international markets.

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Critical Accounting Policies, Significant Judgments and Use of Estimates



Our management's discussion and analysis of financial condition and results of
operations are based upon our consolidated financial statements, which have been
prepared in accordance with accounting principles generally accepted in the
United States of America (U.S. GAAP). The preparation of these consolidated
financial statements requires us to make estimates and judgments that affect the
reported amounts of assets, liabilities, revenues and expenses. On an ongoing
basis, we evaluate our critical accounting policies and estimates. We base our
estimates on historical experience and on various other assumptions that we
believe to be reasonable in the circumstances, the results of which form the
basis for making judgments 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 and conditions. Our significant
accounting policies are more fully described in Note 2 of the accompanying
unaudited condensed consolidated financial statements. Other than the adoption
of ASC 326, Financial Instruments - Credit Losses, there have been no other
significant or material changes in our critical accounting policies during the
six months ended June 30, 2020.

Components of Results of Operations

Revenue



Our revenue is generated primarily from sales to two types of customers:
hospitals and outpatient medical facilities, with each being served primarily
through a direct sales force. Sales to these entities are billed to, and paid
by, the hospitals and outpatient medical facilities as part of their normal
payment processes, with payment received by us in the form of an electronic
transfer, check or credit card payment. Product sales to third-party
distributors are billed to and paid by the distributors as part of their normal
payment processes, with payment received by us in the form of an electronic
transfer.

U.S. revenue is generally recognized after our sales representatives deliver our
product at the point of implantation and upon the completion and authorization
of the implant procedure. In response to competitive practices and pressures, we
have offered some volume price discounting for larger orders, where products are
ordered in advance of an implantation and revenue is recognized when the
transfer of control occurs at the time of shipment.

Revenue from sales of our Senza products fluctuate based on the selling price of
the system, as the average sales price of a system varies geographically and by
the type of system sold, and based on the mix of sales by geography. Our revenue
from international sales can also be significantly impacted by fluctuations in
foreign currency exchange rates, as our sales are denominated in the local
currency in the countries in which we sell our products.

We expect our revenue to fluctuate from quarter to quarter due to a variety of
factors, including seasonality. For example, the industry generally experiences
lower revenues in the first and third quarters of the year and higher revenues
in the fourth quarter. Our revenue has been impacted by these industry trends.
Further, the impact of the buying patterns and implant volumes of hospitals and
medical facilities, and third-party distributors may vary, and as a result could
have an effect on our revenue from quarter to quarter.

Cost of Revenue

We utilize contract manufacturers for the production of Senza products. Cost of revenue consists primarily of acquisition costs of the components of Senza, manufacturing overhead, royalty payments, scrap and inventory excess and obsolescence charges, as well as distribution-related expenses, such as logistics and shipping costs, net of costs charged to customers.



We calculate gross margin as revenue less cost of revenue divided by revenue.
Our gross margin has been and will continue to be affected by a variety of
factors, but primarily by our average sales price and the costs to have our
products manufactured. While costs are primarily incurred in U.S. dollars,
international revenue may be impacted by the appreciation or depreciation of the
U.S. dollar, which may impact our overall gross margin. Our gross margin is also
affected by our ability to reduce manufacturing costs as a percentage of
revenue.

Operating Expenses

Our operating expenses consist of R&D expense, and sales, general and administrative (SG&A) expense. Personnel costs are the most significant component of operating expenses and consist primarily of salaries, bonus incentives, benefits, stock-based compensation and sales commissions.



Research and Development. R&D costs are expensed as incurred. R&D expense
consists primarily of personnel costs, including salary, employee benefits and
stock-based compensation expenses for our R&D employees. R&D expense also
includes costs associated with product design efforts, development prototypes,
testing, clinical trial programs and regulatory activities, contractors and
consultants, equipment and software to support our development, facilities and
information technology. We expect product

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development expenses to decrease in absolute dollars. Our R&D expenses may fluctuate from period to period due to the timing and extent of our R&D and clinical trial expenses.



Sales, General and Administrative. SG&A expense consists primarily of personnel
costs, including salary, employee benefits and stock-based compensation expenses
for our sales and marketing personnel, including sales commissions, and for
administrative personnel that support our general operations, such as
information technology, executive management, financial accounting, customer
service and human resources personnel. We expense commissions at the time of the
sale. SG&A expense also includes costs attributable to marketing, as well as
travel, intellectual property and other legal fees, financial audit fees,
insurance, fees for other consulting services, depreciation and facilities.

In the last three years, we significantly increased the size of our sales presence worldwide and have increased marketing spending in order to generate additional sales opportunities. Additionally, we have made substantial investments in our U.S. commercial infrastructure to support our commercialization efforts in the United States.



During 2017, 2018 and 2019, we had a significant increase in SG&A headcount and
experienced significant legal expenses associated with our various intellectual
property litigation. We anticipate significant continued expenses associated
with these legal activities. Additionally, we continue to incur significant
expenses related to audit, legal, regulatory and tax-related services associated
with maintaining compliance with exchange listing and SEC requirements,
including compliance under the Sarbanes-Oxley Act of 2002 (the Sarbanes-Oxley
Act), director and officer insurance premiums and investor relations costs
associated with being a public company. Our SG&A expense may fluctuate from
period to period due to the seasonality of our revenue and the timing and extent
of our SG&A expense. Additionally, we have seen a decrease in SG&A expense
recently, partially due to reduced travel and sales and marketing activities as
a result of the COVID-19 pandemic.

Interest Income and Interest Expense



Interest income consists primarily of interest income earned on our investments
and interest expense consists of interest paid on our outstanding debt and the
amortization of debt discount and debt issuance costs.

Other Income (Expense), Net

Other income (expense), net consists primarily of foreign currency transaction gains and losses and the gains and losses from the remeasurement of foreign-denominated balances to the U.S. dollar.

Provision for Income Taxes



The provision for income taxes consists primarily of income taxes in foreign
jurisdictions in which we conduct business as well as states where we have
determined we have state nexus. We maintain a full valuation allowance for all
of our U.S. deferred tax assets including net operating loss (NOL) carryforwards
and federal and state tax credits.

Allowance for Doubtful Accounts



We make estimates as to the overall collectability of accounts receivable and
provide an allowance for accounts receivable considered uncollectible based on
current expected credit losses. We specifically analyze accounts receivable
based on historical bad debt experience, customer concentrations, customer
credit-worthiness, the age of the receivable, current economic trends, and
changes in customer payment terms when evaluating the adequacy of the allowance
for doubtful accounts. We record the adjustment in sales, general and
administrative expense.

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