This Annual Report includes "forward-looking statements" within the meaning of
the federal securities laws, particularly statements referencing our
expectations relating to the productivity of our sales force, revenues, deferred
revenues, cost of revenues, operating expenses, stock-based compensation and
provision for income taxes; the growth of our customer base and customer demand
for our products; the sufficiency of our cash balances and cash flows; the
impact of recent changes in accounting standards; the impact of changes in the
tax code as a result of recent federal tax legislation and uncertainty as to how
some of those changes may be applied; market risk sensitive instruments;
contractual obligations; and assumptions underlying any of the foregoing. In
some cases, forward-looking statements can be identified by the use of
terminology such as "may," "will," "expects," "intends," "plans," "anticipates,"
"estimates," "potential," or "continue," or the negative thereof, or other
comparable terminology.

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Although we believe that the expectations reflected in the forward-looking
statements contained herein are reasonable, these expectations or any of the
forward-looking statements could prove to be incorrect, and actual results could
differ materially from those projected or assumed in the forward-looking
statements. Our future financial condition and results of operations, as well as
any forward-looking statements, are subject to risks and uncertainties,
including but not limited to the factors set forth in this Annual Report under
Part I, Item 1A. Risk Factors. All forward-looking statements and reasons why
results may differ included in this Annual Report are made as of the date of the
filing of this Annual Report, and we assume no obligation to update any such
forward-looking statements or reasons why actual results may differ.

The following discussion should be read in conjunction with our consolidated financial statements and notes thereto appearing in Part II, Item 8 of this Annual Report.

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 recently launched 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 $2.5 billion,
pre-COVID-19 pandemic, 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 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 three years on a quarterly basis and
total revenue for each of the past five years.



                        Q1 2018       Q2 2018       Q3 2018      Q4 2018    

Q1 2019 Q2 2019 Q3 2019 Q4 2019 Q1 2020 Q2 2020 Q3 2020 Q4 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 $ 90.9 $ 94.6 International sales 17.0 16.2 16.0 16.3


       16.3          15.5         16.0         16.5          12.2           5.4         17.5         15.1
Total revenue          $    87.6     $    96.1     $    95.6     $  107.9     $    82.1     $    93.6     $  100.2     $  114.4     $    87.5     $    56.4     $  108.5     $  109.7




                     2016        2017        2018        2019        2020
Revenue from:                            (in millions)

U.S. sales $ 173.3 $ 263.5 $ 321.8 $ 326.0 $ 311.9 International sales 55.2 63.2 65.5 64.3 50.2 Total revenue $ 228.5 $ 326.7 $ 387.3 $ 390.3 $ 362.0




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 December 31, 2020 was $492.8 million. A significant amount of our
capital resources has been used to support the development of our Senza products
and

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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 $183.6 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 $147.1 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 currently 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. In the third quarter of 2020, we
made the strategic decision to vertically integrate the assembly of IPG's,
peripherals and various other manufacturing related activities to mitigate our
reliance on third-party manufacturers and improve our long-term gross
margins. We plan on conducting these manufacturing activities in a facility in
Costa Rica, for which our lease will begin in April 2021. The integration
process is expected to be completed in 2022. Even after this integration process
is completed, we expect that we will continue to rely on third-party
manufacturers to provide key components to support the assembly process. We may
incur significant capital expenditures and implementation costs to initiate the
manufacturing operations in Costa Rica.

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
and as governments imposed restrictions on the performance of elective
procedures. Additionally, overall patient willingness to pursue elective
procedures has decreased due to the pandemic. 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.

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In addition, even as the severity of the pandemic subsides, we expect that
demand for Senza system procedures may not return to historic levels as rapidly
as originally anticipated as prospective patients may decide to delay the
procedure until fully vaccinated for COVID-19. Because the rollout of COVID-19
vaccines has, and could continue to, experience significant delays, this may
result in a meaningful delay in patients seeking to have a Senza system trial in
the near term. Further, we anticipate that the substantial backlog of patients
seeking appointments with physicians and surgeries to be performed at hospitals
and ambulatory surgery centers relating to a variety of medical conditions, will
result in patients seeking to have Senza system trials or implant procedures
performed having to navigate limited provider capacity. We believe these factors
may have an adverse effect on the recovery of the global SCS therapy market and,
as a result, the amount of time we predict for our sales to recover following
the end of the pandemic.

Numerous state and local jurisdictions, as well as foreign governments such as
the United Kingdom and Germany, 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.
In multiple instances in 2020, the governor of California, where our
headquarters are located, issued a temporary "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 temporarily 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. 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 both in the United
States and worldwide, 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

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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.

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 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 years ended
December 31, 2020 and 2019, wherein we recorded a write-down of inventory of
$2.7 million and $1.6 million, respectively. 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. These factors subject us to the risk
of inventory obsolescence and expiration, which may lead to inventory impairment
charges. As we release later generations of products that contain advancements
or additional features, the earlier generations may become obsolete, as was the
case in the year ended December 31, 2020, when we recorded a charge of $2.6
million. For the year ended December 31, 2019, we 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 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 at NANS 2020, which was the largest
SCS randomized controlled trial conducted to date for PDN. In January 2021, we
presented the six-month data from our SENZA-PDN study at NANS 2021. With regard
to the SENZA-NSRBP study, we presented the three-month primary endpoint results
in January 2021 at NANS 2021, representing the first release of data from this
randomized controlled trial. Both the SENZA-PDN and SENZA-NSRBP studies are
ongoing, and further data will be presented and published in leading journals as
the data becomes available.

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


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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 $362.0 million for the year ended December 31, 2020. 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 impacted our revenue in 2020 and
we expect continued impact in 2021 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.

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. We believe that the
estimates, judgments and assumptions involved in the accounting for revenue
recognition, inventory, stock-based compensation, income taxes and allowance for
doubtful accounts have the greatest potential impact on our consolidated
financial statements, so we consider these to be our critical accounting
policies. We discuss below the critical accounting estimates associated with
these policies. Historically, our estimates, judgments, and assumptions relative
to our critical accounting policies have not differed materially from actual
results. Our significant accounting policies are more fully described in Note 2,
Summary of Significant Accounting Policies, of Notes to Consolidated Financial
Statements in Part II, Item 8 of this Annual Report.

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Revenue



On January 1, 2018, we adopted the new accounting standard ASC 606, Revenue from
Contracts with Customers, using the modified retrospective method applied to
contracts which were not completed as of that date. Results for reporting
periods beginning after January 1, 2018 are presented under ASC 606, while prior
period amounts are not adjusted and continue to be reported in accordance with
our historic accounting under ASC 605, Revenue Recognition. Under ASC 606,
assuming all other revenue recognition criteria have been met, we will recognize
revenue earlier for arrangements where we have satisfied its performance
obligations but have not issued invoices. These amounts are recorded as unbilled
receivables, which are included in accounts receivable on the consolidated
balance sheet, as we have an unconditional right to payment at the end of the
applicable period.

Revenue is recognized when obligations under the terms of a contract with customers are satisfied, which occurs with the transfer of control of the Company's goods to its customers. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring the goods.



For a majority of sales, where our sales representative delivers our product at
the point of implantation at hospitals or medical facilities, we recognize
revenue upon completion of the procedure and authorization, which represents the
point in time when control transfers to the customers.

For the remaining sales, which are sent from the Company's distribution centers
directly to hospitals and medical facilities, as well as distributor sales,
where product is ordered in advance of an implantation, the transfer of control
occurs at the time of shipment of the product. These customers are obligated to
pay within specified terms regardless of when or if they ever sell or use the
products. We do not offer rights of return or price protection. To the extent
that we have a post-delivery obligation, such as programming devices that have
been delivered as part of a direct-ship order, we defer revenue and the
associated cost of goods sold associated with the post-delivery obligation only
if the amounts are deemed material.

For further discussion on revenue recognition see Note 3, Revenue, of Notes to Consolidated Financial Statements in Part II, Item 8 of this Annual Report.

Inventory Valuation



We contract with third parties for the manufacturing and packaging of all of the
components of our Senza products. We plan the manufacture of our systems based
on estimates of market demand. The nature of our business requires that we
maintain sufficient inventory on hand to meet the requirements of our customers.
Inventories are stated at the lower of cost or net realizable value. Cost is
determined using the standard cost method, which approximates the first-in,
first-out basis. Net realizable value is determined as the prices in the
ordinary course of business, less reasonably predictable costs of completion,
disposal and transportation.

We regularly review inventory quantities compared to forecasted sales to record a provision for excess and obsolete inventory when appropriate. Inventory write-downs are recorded for excess and obsolete inventory. We estimate forecasted sales by considering:



  • product acceptance in the marketplace;


  • customer demand;


  • historical sales;


  • product obsolescence; and


  • technological innovations.

Any inventory write-downs are recorded in cost of revenue within the statements of operations during the period in which such write-downs are determined necessary by management.


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Stock-Based Compensation



Stock-based compensation costs related to stock options granted to employees are
measured at the date of grant based on the estimated fair value of the award,
net of estimated forfeitures. We estimate the grant date fair value, and the
resulting stock-based compensation expense, using the Black-Scholes
option-pricing model. The fair value is recognized on a straight-line basis over
the requisite service period of the stock option award, which is generally the
vesting term of four years, with the exception of performance based stock option
awards, whose fair value is recognized as expenses when it is determined that
achieving the performance metrics are probable.

The Black-Scholes option-pricing model requires the use of highly subjective
assumptions which determine the fair value of stock-based awards. The
assumptions used in our option-pricing model represent management's best
estimates. These estimates are complex, involve a number of variables,
uncertainties and assumptions and the application of management's judgment, so
that they are inherently subjective. If factors change and different assumptions
are used, our stock-based compensation expense could be materially different in
the future. These assumptions are estimated as follows:

Risk-Free Interest Rate. We base the risk-free interest rate used in the
Black-Scholes valuation model on the implied yield available on U.S. Treasury
zero-coupon issues with an equivalent remaining term of the options for each
option group.

Expected Term. The expected term represents the period that our stock-based awards are expected to be outstanding. We utilize our historical data for the calculation of expected term.



Volatility. We have incorporated our historical stock trading volatility with
those of our peer group for the calculation of volatility. Industry peers
consist of several public companies in the medical device technology industry
with comparable characteristics including enterprise value, risk profiles and
position within the industry. We regularly evaluate our peer group to assess
changes in circumstances where identified companies may no longer be similar to
us, in which case, more suitable companies whose share prices are publicly
available would be utilized in the calculation.

Dividend Yield. The expected dividend assumption is based on our current expectations about our anticipated dividend policy. We currently do not expect to issue any dividends.



In addition to assumptions used in the Black-Scholes option-pricing model, we
must also estimate a forfeiture rate to calculate the stock-based compensation
for our awards. We will continue to use judgment in evaluating the assumptions
related to our stock-based compensation on a prospective basis. As we continue
to accumulate additional data, we may have refinements to our estimates, which
could materially impact our future stock-based compensation expense.

In 2015, we began issuing restricted stock units (RSUs). We account for
stock-based compensation for the RSUs at their fair value, based on the closing
market price of our common stock on the grant date. These costs are recognized
on a straight-line basis over the requisite service period, which is generally
the vesting term of four years.

In 2016, we granted performance based RSUs to our former CEO that only vest upon
the achievement of specific operational performance criteria. The stock-based
compensation for these performance based RSUs are recognized as expenses when it
is determined that achieving the performance metrics are probable. Upon the
former CEO's resignation from the Company in March 2019, the unvested shares
subject to this award as of the separation date have been cancelled.

In 2019, we granted RSUs to our current CEO, which entitle him to receive a
number of shares of our common stock based on our stock price performance
compared to a specified target composite index over a three-year period. The
number of shares to be issued upon vesting ranges from zero to 3.5 times the
number of RSUs granted, depending on the relative performance of our common
stock compared to the targeted composite index. The fair value of these grants
is determined by using the Monte Carlo simulation model, which is based on a
discounted cash flow approach, and requires inputs such as expected volatility
of our stock price, expected volatility

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of the targeted composite index, correlation between the changes in our stock
price and the target composite index, risk-free interest rate and expected
dividends. The expected volatility of our stock and the target composite index
is based on the historical data. Correlation is based on the historical
relationship between our stock price and the target composite index. The
risk-free interest rate is based upon the treasury yield consistent with the
vesting term of the grant. The expected dividend yield is zero. Stock-based
compensation for these restricted stock units is recognized over the specified
performance measurement.

We estimate the fair value of the rights to purchase shares by employees under
our Employee Stock Purchase Plan using the Black-Scholes option pricing formula.
Our Employee Stock Purchase Plan provides for consecutive six-month offering
periods and we use our own historical volatility data in the valuation.

Income Tax



We recognize deferred income taxes for temporary differences between the basis
of assets and liabilities for financial statement and income tax purposes. We
periodically evaluate the positive and negative evidence bearing upon
realizability of our deferred tax assets. Based upon the weight of available
evidence, which includes our historical operating performance, reported
cumulative net losses since inception and difficulty in accurately forecasting
our future results, we maintained a full valuation allowance on our net U.S.
federal and state deferred tax assets as of December 31, 2020 and 2019. We
intend to maintain a full valuation allowance on the federal and state deferred
tax assets until sufficient positive evidence exists to support reversal of the
valuation allowance.

As of December 31, 2020, we had federal net operating loss carryforwards (NOLs)
of $497.5 million, of which $238.5 million was generated in fiscal year 2018 and
thereafter, which can be carried forward indefinitely under the 2017 Tax Act, as
well as state NOLs of $272.8 million, of which $41.5 million may be carried
forward indefinitely. If not utilized, the remaining federal NOLs will begin to
expire in 2026 and the state NOLs will begin to expire 2021. We have no foreign
NOL carryforwards. We also have federal research tax credit carryforwards that
will begin to expire in 2026 and California research tax credits that do not
expire. Realization of these NOL and research tax credit carryforwards depends
on future income, and there is a risk that our existing carryforwards could
expire unused and be unavailable to reduce future income tax liabilities, which
could materially and adversely affect our results of operations.

In addition, under Section 382 of the Internal Revenue Code of 1986, as amended
(the Code) our ability to utilize NOL carryforwards or other tax attributes such
as research tax credits, in any taxable year may be limited if we experience, or
have experienced, a Section 382 "ownership change." A Section 382 "ownership
change" generally occurs if one or more stockholders or groups of stockholders,
who own at least 5% of our stock, increase their ownership by a greater than
50 percentage point change (by value) over a rolling three-year period. Similar
rules may apply under state tax laws.

No deferred tax assets have been recognized on our balance sheet related to our
NOLs and tax credits, as they are fully reserved by a valuation allowance. We
experienced a Section 382 "ownership change" as a result of our June 2015
underwritten public offering. We currently estimate this "ownership change" will
not inhibit our ability to utilize our NOLs. However, we may, in the future,
experience one or more additional Section 382 "ownership changes" as a result of
subsequent changes in our stock ownership, some of which changes are outside our
control. If so, we may not be able to utilize a material portion of our NOLs and
tax credits even if we achieve profitability and generate sufficient taxable
income. If we are limited in our ability to use our NOLs and tax credits in
future years in which we have taxable income, we will pay more taxes than if we
were able to fully utilize our NOLs and tax credits. This could materially and
adversely affect our results of operations.

We record unrecognized tax benefits as liabilities and adjust these liabilities
when our judgment changes as a result of the evaluation of new information not
previously available. Because of the complexity of some of these uncertainties,
the ultimate resolution may result in a payment that is materially different
from our current estimate of the unrecognized tax benefit liabilities. These
differences will be reflected as increases or decreases to income tax expense in
the period in which new information is available. Our policy is to recognize
interest and penalties related to income taxes as a component of income tax
expense. A nominal amount of interest and penalties have been recognized in the
statements of operations and comprehensive loss in 2020 and 2019. No interest or
penalties related to income taxes have been recognized in the statements of
operations and comprehensive loss in 2018.

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On December 22, 2017, the 2017 Tax Cuts and Jobs Act (the 2017 Tax Act) was
enacted into law. The recorded impact for the effects of the 2017 Tax Act is
based on our current knowledge, assumptions and interpretations of available
guidance. We elected to account for Global Intangible Low-Taxed Income (GILTI)
as a current period expense when incurred. We will continue to monitor the
issuance of additional regulatory or accounting guidance and record any
necessary adjustments in the period for which additional guidance is issued.

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 general and administrative
expense. Our accounts receivable balance was $77.7 million, net of allowance of
$3.0 million, as of December 31, 2020 and $82.8 million, net of allowance of
$0.8 million, as of December 31, 2019.

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 historically 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. The
normal seasonal fluctuations of our revenue have been disrupted by the COVID-19
pandemic, as we have seen significant fluctuations in our quarterly revenue
based on current events directly caused by the pandemic. We have recorded
revenue of approximately $173.3 million, $263.5 million, $321.8 million, $326.0
million and $311.9 million for the years ended December 31, 2016, 2017, 2018,
2019 and 2020, respectively, for sales in the United States. We anticipate that
our total revenue will increase as we continue our commercialization in the
United States.

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.


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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 development expenses to increase in
absolute dollars as we continue to develop product enhancements to Senza. 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.

We significantly increased the size of our sales presence worldwide during 2018
and 2019, and we have maintained the overall size of our sales organization in
2020. In the last three years, we 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. We expect SG&A expenses to
decrease as a percent of revenue as we engage in activities that leverage our
existing sales and marketing personnel to support the commercialization of our
products in the United States.

During 2018, 2019 and 2020, we had experienced significant legal expenses
associated with our intellectual property litigation with Boston Scientific. 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, the timing and extent of our SG&A expense, and the
direct impact of the COVID-19 pandemic on certain discretionary spend items such
as travel and trade shows.

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.


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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
substantially all of our deferred tax assets including net operating loss (NOL)
carryforwards and federal and state tax credits.

Recent Accounting Pronouncements

For recent accounting pronouncements, see Note 2, Summary of Significant Accounting Policies, of Notes to Consolidated Financial Statements in Part II, Item 8 of this Annual Report.

Comparison of the Years Ended December 31, 2020 and 2019

Revenue, Cost of Revenue, Gross Profit and Gross Margin





                    Years Ended December 31,
                      2020              2019         Change
(in thousands)
Revenue           $     362,048       $ 390,255     $ (28,207 )
Cost of revenue         112,146         121,905        (9,759 )
Gross profit      $     249,902       $ 268,350     $ (18,448 )
Gross margin           69%               69%           0%




Revenue. Revenue decreased to $362.0 million in 2020 from $390.3 million in
2019, a decrease of $28.2 million, or 7%. The decrease in revenue was a result
of a worldwide decline in procedure volume, as healthcare systems diverted
resources to meet the increasing demands of managing COVID-19 pandemic and as
elective procedures were significantly limited and, in many places, halted
entirely during portions of the year.

Cost of Revenue, Gross Profit and Gross Margin. Cost of revenue decreased to
$112.1 million in 2020 from $121.9 million in 2019, a decrease of $9.8 million,
or 8%. This decrease was primarily due to a net $9.0 million decrease in the
costs of manufactured product components, as well as a $1.1 million decrease
related to product accessories used as part of developing our operational
infrastructure in the U.S. Gross profit decreased to $249.9 million in 2020 from
$268.4 million in 2019, a decrease of $18.4 million, or 7%. Gross profit as a
percentage of revenue, or gross margin, remained steady at 69% in 2020 and 2019.

Operating Expenses



                                                     Years Ended December 31,
                                                2020                          2019
                                                       % of                          % of
                                                       Total                         Total         Change
                                       Amount         Revenue        Amount         Revenue        Amount
(in thousands)
Operating expenses:
Research and development              $  45,600         13%         $  59,017         15%         $ (13,417 )
Sales, general and administrative       267,154         74%           305,812         78%           (38,658 )
Total operating expenses              $ 312,754         86%         $ 364,829         93%         $ (52,075 )




Research and Development (R&D) Expenses. R&D expenses decreased to $45.6 million
in 2020 from $59.0 million in 2019, a decrease of $13.4 million, or 23%. The
decrease was primarily due to a decrease in clinical and development expenses of
$7.9 million, personnel and consulting costs of $3.0 million and travel expenses
of $1.9 million.

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Sales, General and Administrative (SG&A) Expenses. SG&A expenses decreased to
$267.2 million in 2020 from $305.8 million in 2019, a decrease of $38.7 million,
or 13%. This decrease was primarily due to a decrease in personnel costs of
$22.0 million, travel and training expenses of $10.9 million and healthcare
professional-related expenses of $7.8 million, which were partially offset by
increased bad debt expense of $1.4 million and software expenses of $1.3
million.

Interest Income, Interest Expense, Other Income (Expense), Net, Loss on Extinguishment of Debt and Provision for Income Taxes





                                Years Ended December 31,
                                  2020              2019         Change
(in thousands)
Interest income               $       2,956       $   6,020     $  (3,064 )
Interest expense                    (21,806 )       (10,931 )     (10,875 )
Other income (expense), net            (495 )          (697 )         202
Provision for income taxes              868           1,599          (731 )




Interest Income. Interest income decreased to $3.0 million in 2020 from $6.0
million in 2019, primarily as a result of a decrease in our investment yield
rate.

Interest Expense. Interest expense increased to $21.8 million in 2020 from $10.9
million in 2019. We recorded $10.3 million of expenses related to the interest
and amortization of debt discount and debt issuance costs related to the 2025
Notes, which were issued in April 2020. There was also a $0.6 million increase
in the amortization of debt discount and debt issuance costs related to the 2021
Notes.

Other Income (Expense), Net. Other income (expense), net was primarily comprised
of foreign currency transaction gains and losses, and the gains and losses from
the remeasurement of foreign-denominated balances. We recorded a net gain of
$41,000 in 2020 and a net loss of $0.6 million in 2019 in relation to the two
items previously mentioned. Our remeasurement gains and losses are affected by
changes in the foreign currency translation rates of the countries in which we
conduct business. Additionally, in 2020, we recorded a net expense of $0.4
million for the impairment charge related to the value of the right to acquire a
privately-held company.

Income Tax Expense. Income tax expense was $0.9 million in 2020 and $1.6 million
in 2019. Our income tax expense is associated primarily with foreign and state
income taxes. We continue to generate tax losses for U.S. federal and state tax
purposes and have NOL carryforwards creating a deferred tax asset. We have a
full valuation allowance on the majority of our deferred tax assets. The change
in income tax expense was primarily due to changes in foreign income taxes on
profits realized by our foreign subsidiaries.

Liquidity, Capital Resources and Plan of Operations



Since our inception, we have financed our operations through private placements
of preferred stock, the issuance of common stock in our IPO in November 2014 and
our underwritten public offering in June 2015, borrowings under our credit
facility, which we have subsequently repaid, and the June 2016 issuance of
convertible senior notes due 2021. In April 2020, we completed a concurrent
underwritten public offering of common stock and convertible senior notes due
2025. Our total net proceeds from these transactions, after giving effect to the
note hedge transactions and warrant transactions and associated offering expense
was $313.3 million. At December 31, 2020, we had cash, cash equivalents and
short-term investments of $588.0 million. Based on our current operating plan,
we expect that our cash and cash equivalents on hand, together with the
anticipated funds from the collection of our receivables, will be sufficient to
fund our operations through at least the next 12 months.

We expect to incur continued expenditures in the future in support of our
commercial infrastructure and sales force. In addition, we intend to continue to
make investments in the further development of our Senza product platform and
HF10 therapy for the treatment of other chronic pain conditions, including
ongoing R&D programs and conducting clinical trials. Further, we expect to
expend significant cash resources pursuing and defending our ongoing
intellectual property lawsuits. In order to further enhance our R&D efforts,
pursue product expansion

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opportunities or acquire a new business or products that are complementary to our business, we may choose to raise additional funds.



We may continue to seek funds through equity or debt financings, or through
other sources of financing. Adequate additional funding may not be available to
us on acceptable terms or at all. Our failure to raise capital in the future
could have a negative impact on our financial condition and our ability to
pursue our business strategies. Should we choose to raise additional capital,
the requirements will depend on many factors, including:

• the impact of the ongoing COVID-19 pandemic and any recession or other

market correction resulting from the pandemic;

• the costs related to the continued commercialization of our products in

the United States and elsewhere, including product sales, marketing,

manufacturing and distribution;

• the cost of filing, prosecuting, defending and enforcing any patent claims

and other intellectual property rights, including, in particular, the

costs of enforcing our patent rights in the action we filed against Boston

Scientific and in defending against Boston Scientific's action against us;

• the R&D activities we intend to undertake in order to expand the chronic

pain indications and product enhancements that we intend to pursue;

• whether or not we pursue acquisitions or investments in businesses,

products or technologies that are complementary to our current business;

• the degree and rate of market acceptance of our products in the United

States and elsewhere;

• changes or fluctuations in our inventory supply needs and forecasts of our

supply needs;

• costs related to the development of our internal manufacturing capabilities;




  • our need to implement additional infrastructure and internal systems;

• our ability to hire additional personnel to support our operations as a

public company; and

• the emergence of competing technologies or other adverse market developments.




Our success depends, in part, upon our ability to establish a competitive
position in the neuromodulation market by securing broad market acceptance of
our HF10 therapy and our Senza product platform for the treatment of chronic
pain conditions. Any product we develop that achieves regulatory clearance or
approval will have to compete for market acceptance and market share. We face
significant competition in the United States and internationally, which we
believe will intensify as we continue to commercialize in the United States. For
example, our major competitors, Medtronic, Boston Scientific and Abbott
Laboratories, each have approved neuromodulation systems in at least the United
States, Europe and Australia and have been established for several years. In
addition to these major competitors, we may also face competition from other
emerging competitors and smaller companies with active neuromodulation system
development programs that may emerge in the future.

If we are unable to raise, or have access, to sufficient funds when needed, we
may be required to delay, reduce, or terminate some or all of our commercial
development plans.

The following table sets forth the primary sources and uses of cash for each of
the periods presented below:



                                                             Years Ended December 31,
                                                          2020          2019          2018
(in thousands)
Net cash provided by (used in)
Operating activities                                   $    1,191     $ (50,225 )   $ (5,708 )
Investing activities                                     (369,868 )      32,330        6,433
Financing activities                                      346,905        32,093        7,754
Effect of exchange rate on cash flows                         646           259         (258 )
Net increase (decrease) in cash, cash equivalents
and restricted cash                                    $  (21,126 )   $  14,457     $  8,221


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Cash Provided by (Used in) Operating Activities. Net cash provided by operating
activities was $1.2 million for the year ended December 31, 2020. The cash
provided by operating activities for the year ended December 31, 2020 was
affected by a decrease in prepaids and other assets of $7.5 million, a decrease
in accounts receivable of $3.4 million, and a decrease in inventory of $2.5
million, as well as non-cash stock based compensation expense of $42.7 million,
non-cash interest expense of $14.9 million, inventory write-down of $5.4
million, depreciation and amortization of $4.8 million, amortization of
operating lease assets of $3.4 million and provision of doubtful accounts of
$2.2 million. These changes were offset by a net loss of $83.1 million for the
year and a decrease in long term liabilities of $2.4 million. Net cash used in
operating activities were $50.2 million, and $5.7 million for the years ended
December 31, 2019 and 2018, respectively, primarily due to the net losses during
the periods of $103.7 million and $49.2 million, respectively. The cash used in
operating activities for the year ended December 31, 2019 was affected by an
increase in accounts receivable of $2.2 million and an increase in prepaids and
other assets of $3.2 million. These changes were offset by a net increase in
accounts payable and accrued liabilities of $5.7 million and write-down of
inventories of $1.5 million, as well as non-cash stock based compensation
expense of $41.7 million, non-cash interest expense of $7.9 million,
depreciation and amortization of $4.6 million and amortization of operating
lease assets of $3.2 million. The cash used in operating activities for the year
ended December 31, 2018 was affected by an increase in accounts receivable of
$12.2 million and an increase in other assets of $2.6 million. These changes
were offset by a net increase in accounts payable and accrued liabilities of
$4.9 million and a decrease in inventory of $3.8 million, as well as non-cash
stock based compensation expense of $36.6 million, non-cash interest expense of
$7.4 million, depreciation and amortization of $3.9 million and a write-down of
inventory of $2.0 million.

Cash Used in Investing Activities. Investing activities consisted primarily of
changes in investment balances, including purchases and maturities of short-term
investments, and purchases of property and equipment. For the year ended
December 31, 2020, we had net purchases from the sales and maturity of
investments of $371.3 million and purchases in property and equipment of $6.0
million, offset by the receipt of $7.5 million for the repayment of secured
convertible notes from a private company. For the year ended December 31, 2019,
we had net proceeds from the sales and maturity of investments of $43.3 million,
offset by purchases in property and equipment of $3.5 million. Additionally, we
purchased secured convertible notes totaling $7.5 million in the year ended
December 31, 2019. For the year ended December 31, 2018, we had net proceeds
from the sales and maturity of investments of $14.7 million, which was offset by
purchases in property and equipment of $8.2 million.

Cash Provided by Financing Activities. Cash provided by financing activities was
$346.9 million for the year ended December 31, 2020. The majority of this cash
was from the proceeds of $183.6 million, net of issuance costs, from the 2025
Notes and the proceeds of $147.1 million, net of issuance costs, from the
concurrent public common stock offering. The cash received from these activities
was offset by a net $17.5 million cost of convertible note hedge and warrant
transactions, which included the $52.4 million purchase of convertible note
hedges and proceeds of $34.9 million related to the sale of
warrants. Additionally, we received cash of $33.6 million from the issuance of
common stock to employees pursuant to the exercise of employee stock options and
our employee stock purchase plan, net of tax withholdings. Cash provided by
financing activities was $32.1 million for the year ended December 31, 2019,
primarily due to the cash received from the issuance of common stock to
employees of $35.2 million pursuant to the exercise of employee stock options
and our employee stock purchase plan, offset by $3.1 million for tax
withholdings paid on behalf of employees for net share settlement. Cash provided
by financing activities was $7.8 million for the year ended December 31, 2018,
primarily due to the cash received from the issuance of common stock to
employees of $9.5 million pursuant to the exercise of employee stock options and
our employee stock purchase plan.

Contractual Obligations and Commitments



We have lease obligations primarily consisting of operating leases for our
principal offices, which expire as set forth below, and for our warehouse space
that expires in 2022. In 2020, we also entered into an operating lease for a
manufacturing facility with a planned commencement date of April 2021 and a
planned expiration date of June 2031.

In March 2015, we entered into a lease agreement for approximately 50,740 square
feet of office space located in Redwood City, California for a period beginning
in June 2015 and ending in May 2022, with initial annual

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payments of approximately $2.0 million, increasing to $2.4 million annually in
the final year of the lease term. In December 2016, we entered into a first
amendment to the lease for an additional approximately 49,980 square feet of
office space adjacent to the premises under the original lease (the Expansion
Premises) with initial annual payments of $1.2 million, increasing to $2.9
million in the final year of the amended lease term. The lease for the Expansion
Premises commenced on June 1, 2018. The first amendment also extends the lease
term for the original premises to terminate on the same date as the amended
lease, which is May 31, 2025. In April 2017, we entered into a second amendment
to the lease for a temporary space of approximately 8,171 square feet for a
period beginning in May 2017, and which ended on June 1, 2018, the Commencement
Date of the Expansion Premises. See Note 7, Commitments and Contingencies, of
Notes to Consolidated Financial Statements for additional information.

In August 2014, we entered into a facility lease for warehouse space beginning on August 21, 2014 through May 31, 2015. In March 2015, we extended our warehouse lease through February 2017, at which time the lease terminated.



In February 2017, we entered into a separate non-cancellable facility lease for
warehouse space beginning March 1, 2017 through February 28, 2022, under which
we are obligated to pay approximately $0.4 million in lease payments over the
term of the lease.

In August 2020, we entered into a lease for approximately 35,411 square feet of
manufacturing space to begin in April 2021 and to last through June 2031 at a
facility in Costa Rica, under which we are obligated to pay approximately $3.9
million in lease payments over the term of the lease. We plan to use this
facility to build-out certain manufacturing capabilities so that we can
vertically integrate the assembly of IPG's, peripherals and various other
manufacturing related activities.

We have also entered into a service agreement for which we are committed to pay
$2.5 million in each of the next four years over the term of the service
agreement, as well as a license agreement for which we are committed to pay $0.2
million over the remaining term of license agreement.

As of December 31, 2020, our contractual obligations related to the 2021 Notes
are payments of interest and principal totaling $174.0 million due in June
2021. Our contractual obligations related to the 2025 Notes are payments of
interest of $5.2 million due each year from 2021 through 2024, and payments of
interest and principal totaling $192.4 million due in 2025.

The following table summarizes our contractual obligations as of December 31, 2020 (in thousands), including the lease in Costa Rica with a planned commencement date of April 2021:





                                                                      Payment date by period
                                     Total       Less than 1 year       1

to 3 years 4 to 5 years More than 5 years


                                                                          (in thousands)
Notes payable, including
contractual interest               $ 387,241     $         179,228     $       10,436     $      197,577     $                 -
Lease obligations                     28,004                 5,253             11,510              8,861                   2,380
Purchase obligations                  10,228                 2,607              5,114              2,507                       -
Total                              $ 425,473     $         187,088     $   

   27,060     $      208,945     $             2,380





Off-Balance Sheet Arrangements



Through December 31, 2020, we did not have any relationships with unconsolidated
organizations or financial partnerships, such as structured finance or special
purpose entities that would have been established for the purpose of
facilitating off-balance sheet arrangements or other contractually narrow or
limited purposes. For information regarding indemnification obligations, refer
to Note 7, Commitments and Contingencies, of Notes to the Consolidated Financial
Statements within Part II, Item 8 of this Annual Report.

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Segment Information

We have one primary business activity and operate as one reportable segment.

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