The following discussion and analysis of our financial condition and results of
operations should be read in conjunction with our consolidated financial
statements and related notes included elsewhere in this Annual Report on
Form 10­K. In addition to historical consolidated financial information, the
following discussion contains forward­looking statements that reflect our plans,
estimates and beliefs. Our actual results could differ materially from those
discussed in the forward­looking statements. See "Special Note Regarding
Forward­Looking Statements." Factors that could cause or contribute to these
differences include those discussed below and elsewhere in this Annual Report on
Form 10­K, particularly in "Risk Factors."

Overview

We are a life sciences company that has developed next generation, ultra-sensitive digital immunoassay platforms that advance precision health for life sciences research and diagnostics. Our platforms are based on our proprietary digital "Simoa" detection technology. Our Simoa bead-based and planar array platforms enable customers to


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reliably detect protein biomarkers in extremely low concentrations in blood,
serum and other fluids that, in many cases, are undetectable using conventional,
analog immunoassay technologies, and also allow researchers to define and
validate the function of novel protein biomarkers that are only present in very
low concentrations and have been discovered using technologies such as mass
spectrometry. These capabilities provide our customers with insight into the
role of protein biomarkers in human health that has not been possible with other
existing technologies and enable researchers to unlock unique insights into the
continuum between health and disease. We believe this greater insight will
enable the development of novel therapies and diagnostics and facilitate a
paradigm shift in healthcare from an emphasis on treatment to a focus on earlier
detection, monitoring, prognosis and, ultimately, prevention. We are currently
focusing on protein detection, which we believe is an area of significant unmet
need and where we have significant competitive advantages. However, in addition
to enabling new applications and insights in protein analysis, we are also
developing our Simoa bead-based technology to detect nucleic acids in biological
samples.



We currently sell all of our products for life science research, primarily to
laboratories associated with academic and governmental research institutions, as
well as pharmaceutical, biotechnology and contract research companies, through a
direct sales force and support organizations in North America and Europe, and
through distributors or sales agents in other select markets, including
Australia, Brazil, China, Czech Republic, India, Israel, Japan, Lebanon, Mexico,
Qatar, Saudi Arabia, Singapore, South Korea and Taiwan.



Our instruments are designed to be used either with assays fully developed by
us, including all antibodies and supplies required to run the tests, or with
"homebrew" kits where we supply some of the components required for testing, and
the customer supplies the remaining required elements. Accordingly, our
installed instruments generate a recurring revenue stream. We believe that our
recurring consumable revenue is driven by our customers' ability to extract more
valuable data using our platform and to process a large number of samples
quickly with little hands-on preparation.



We commercially launched our first immunoassay platform, the Simoa HD-1, in
January 2014. The HD-1 is based on our bead-based technology, and assays run on
the HD-1 are fully automated. We initiated commercial launch of the SR-X
instrument in December 2017. The SR-X utilizes the same Simoa bead-based
technology and assay kits as the HD-1 in a compact benchtop form with a lower
price point, more flexible assay preparation, and a wider range of applications.
In July 2019, we launched the Simoa HD-X, an upgraded version of the Simoa HD-1,
which replaces the HD-1. The HD-X has been designed to deliver significant
productivity and operational efficiency improvements, as well as greater user
flexibility. We began shipping and installing HD-X instruments at customer
locations in the third quarter of 2019, ahead of our original fourth quarter
expectation. As the installed base of the Simoa instruments increases, total
consumables revenue overall is expected to increase. We believe that consumables
revenue should be subject to less period-to-period fluctuation than our
instrument sales revenue, and will become an increasingly important contributor
to our overall revenue.



On January 30, 2018, we acquired Aushon for $3.2 million in cash, with an
additional payment of $0.8 million made in July 2018, six months after the
acquisition date. With the acquisition of Aushon, we acquired a CLIA certified
laboratory, as well as Aushon's proprietary sensitive planar array detection
technology. Leveraging our proprietary sophisticated Simoa image analysis and
data analysis algorithms, we further refined this planar array technology to
develop the SP-X instrument to provide the same Simoa sensitivity found in our
Simoa bead-based platform. We initiated an early-access program for the SP-X
instrument in January 2019, with the full commercial launch commenced in
April 2019.



On August 1, 2019, we completed our acquisition of Uman for an aggregate
purchase price of $21.2 million, comprised of (i) $15.7 million in cash plus
(ii) 191,152 shares of our common stock (representing $5.5 million based on the
closing prices of our common stock on the Nasdaq Global Market on July 1, 2019
and August 1, 2019, the dates of issuance). The acquisition closed with respect
to 95% of the outstanding shares of capital stock of Uman on July 1, 2019 and
with respect to the remaining 5% of the outstanding shares of capital stock of
Uman on August 1, 2019. Uman supplies neurofilament light (Nf-L) antibodies and
ELISA kits, which are widely recognized by researchers and biopharmaceutical and
diagnostics companies world-wide as the premier solution for the detection of
Nf-L to advance the development of therapeutics and diagnostics for
neurodegenerative conditions.

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As of December 31, 2019, we had cash and cash equivalents of $109.2 million.
Since inception, we have incurred net losses. Our net loss was $40.8 million,
$31.5 million, and $27.0 million for the years ended December 31, 2019, 2018,
and 2017, respectively. As of December 31, 2019, we had an accumulated deficit
of $216.2 million and stockholders' equity of $128.7 million. We expect to
continue to incur significant expenses and operating losses at least through the
next 24 months. We expect our expenses will increase substantially as we:

· expand our sales and marketing efforts to further commercialize our products;

· strategically acquire companies or technologies that may be complementary to

our business;

· expand our research and development efforts to improve our existing products

and develop and launch new products, particularly if any of our products are

deemed by the United States Food and Drug Administration, or FDA, to be medical

devices or otherwise subject to additional regulation by the FDA;

· seek premarket approval, or PMA, or 510(k) clearance from the FDA for our

existing products or new products if or when we decide to market products for

use in the prevention, diagnosis or treatment of a disease or other condition;




 ·  hire additional personnel and continue to grow our employee headcount;

· enter into collaboration arrangements, if any, or in-license other products and

technologies;

· add operational, financial and management information systems; and

· incur increased costs as a result of operating as a public company.

Financial Operations Overview

Revenue



Under Topic 606, an entity recognizes revenue when its customer obtains control
of promised goods or services, in an amount that reflects the consideration that
the entity expects to receive in exchange for those goods or services. To
determine revenue recognition for arrangements that an entity determines are
within the scope of Topic 606, the entity performs the following five steps: (i)
identify the contract(s) with a customer; (ii) identify the performance
obligations in the contract; (iii) determine the transaction price, including
variable consideration, if any; (iv) allocate the transaction price to the
performance obligations in the contract; and (v) recognize revenue when (or as)
the entity satisfies a performance obligation. We only apply the five-step model
to contracts when it is probable that the entity will collect the consideration
to which it is entitled in exchange for the goods or services it transfers to
the customer.

Once a contract is determined to be within the scope of Topic 606, we assess the
goods or services promised within each contract and determine those that are
performance obligations. Arrangements that include rights to additional goods or
services that are exercisable at a customer's discretion are generally
considered options. We assess if these options provide a material right to the
customer and if so, they are considered performance obligations. The
identification of material rights requires judgments related to the
determination of the value of the underlying license relative to the option
exercise price, including assumptions about technical feasibility and the
probability of developing a candidate that would be subject to the option
rights. The exercise of a material right is accounted for as a contract
modification for accounting purposes.

The transaction price is then determined and allocated to the identified
performance obligations in proportion to their standalone selling prices ("SSP")
on a relative SSP basis. SSP is determined at contract inception and is not
updated to reflect changes between contract inception and when the performance
obligations are satisfied. Determining the SSP for performance obligations
requires significant judgment. In developing the SSP for a performance
obligation, we consider applicable market conditions and relevant
entity-specific factors, including factors that were contemplated in negotiating
the agreement with the customer and estimated costs. We validate the SSP for
performance obligations by evaluating whether changes in the key assumptions
used to determine the SSP will have a significant effect on the allocation of
arrangement consideration between multiple performance obligations.

We generate product revenue primarily from sales of our HD-X, HD­1, SR­X, and
SP­X instruments and related reagents and other consumables. We currently sell
our products for research use only applications and our

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customers are primarily laboratories associated with academic and governmental
research institutions, as well as pharmaceutical, biotechnology and contract
research companies. Sales of our consumables have consistently increased due to
an increasing number of instruments being installed in the field, all of which
require certain of our consumables to run customers' specific tests. Consumable
revenue consists of sales of complete assays which are developed internally by
us, plus sales of "homebrew" kits which contain all the elements necessary to
run tests with the exception of the specific antibodies utilized which are
separately provided by the customer.

Service and other revenue consists of testing services provided by us in our
Accelerator Laboratory on behalf of certain research customers, in addition to
warranty and other service­based revenue. Services provided in our Accelerator
Laboratory include sample testing, homebrew assay development and custom assay
development.

Collaboration and license revenue consists of revenue associated with licensing our technology to third parties and for related services.

Cost of Products, Services and Collaboration Revenue



Cost of goods sold for products consists of HD-X, HD­1, and SR­X instrument
costs from the manufacturer. Cost of goods sold for SP­X consists of costs based
on the internal assembly of this item. Raw material part costs, associated
freight, shipping and handling costs, contract manufacturer costs, salaries,

personnel costs, royalties, stock­based compensation, overhead and other direct costs related to those sales are classified as cost of goods sold for products.



Cost of goods sold for services consists of salaries and other personnel costs,
royalties, stock­based compensation and facility costs associated with operating
the Accelerator Laboratory on behalf of customers, in addition to costs related
to warranties and other costs of servicing equipment at customer sites.

Cost of collaboration revenue consists of royalty expense due to third parties from revenue generated by collaboration or license deals.

Research and Development Expenses



Research and development expenses consist of salaries and other personnel costs,
stock­based compensation, research supplies, third­party development costs for
new products, materials for prototypes, and allocated overhead costs that
include facility and other overhead costs. We have made substantial investments
in research and development since our inception, and plan to continue to make
substantial investments in the future. Our research and development efforts have
focused primarily on the tasks required to support development and
commercialization of new and existing products. We believe that our continued
investment in research and development is essential to our long­term competitive
position and expect these expenses to increase in future periods.

Selling, General and Administrative Expenses



Selling, general and administrative expenses consist primarily of salaries and
other personnel costs, and stock­based compensation for our sales and marketing,
finance, legal, human resources and general management, as well as professional
services, such as legal and accounting services. We expect selling, general and
administrative expenses to increase in future periods as the number of sales,
technical support and marketing and administrative personnel grows and we
continue to introduce new products, broaden our customer base and grow our
business. We also expect to incur additional expenses as a public company,
including expenses related to compliance with the rules and regulations of the
Securities and Exchange Commission and the Nasdaq Stock Market, additional
insurance expenses, and expenses related to investor relations activities and
other administrative and professional services.

Critical Accounting Policies, Significant Judgments and Estimates



Our consolidated financial statements and the related notes included elsewhere
in this Annual Report on Form 10­K are prepared in accordance with accounting
principles generally accepted in the United States. The

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preparation of these consolidated financial statements requires us to make
estimates and assumptions that affect the reported amounts of assets,
liabilities, revenue, costs and expenses and related disclosures. We base our
estimates on historical experience and on various other assumptions that we
believe to be reasonable under the circumstances. Changes in accounting
estimates may occur from period to period. Accordingly, actual results could
differ significantly from the estimates made by our management. We evaluate our
estimates and assumptions on an ongoing basis. To the extent that there are
material differences between these estimates and actual results, our future
financial statement presentation, financial condition, results of operations and
cash flows will be affected.

We believe that the following critical accounting policies involve a greater
degree of judgment and complexity than our other significant accounting
policies. Accordingly, these are the policies we believe are the most critical
to understanding and evaluating our consolidated financial condition and results
of operations. Our significant accounting policies are more fully described in
"Significant Accounting Policies" (Note 2) in the notes to our consolidated
financial statements included elsewhere in this Annual Report on Form 10­K.

Revenue Recognition



We recognize revenue when a customer obtains control of a promised good or
service. The amount of revenue recognized reflects consideration that we expect
to be entitled to receive in exchange for these goods and services, incentives
and taxes collected from customers, that are subsequently remitted to
governmental authorities.

We adopted Financial Accounting Standards Board (FASB) Accounting Standards
Codification (ASC) Topic 606, Revenue from Contracts with Customers, or ASC 606,
on January 1, 2019, using the modified retrospective method for all contracts
not completed as of the date of adoption. The reported results for 2019 reflect
the application of ASC 606 guidance, while the reported results for 2018 were
prepared under ASC 605, Revenue Recognition

Product Revenue



Our products are composed of analyzer instruments, assay kits and other
consumables such as reagents.  Products are sold directly to biopharmaceutical
and academic research organizations or are sold through distributors in EMEA and
Asia Pacific regions.  The sales of instruments are generally accompanied by an
initial year of implied service-type warranties and may be bundled with assays
and other consumables and may also include other items such as training and
installation of the instrument and/or an extended service warranty. Revenues
from the sale of products are recognized at a point in time when we transfer
control of the product to the customer, which is upon installation for
instruments sold to direct customers, and based upon shipping terms for assay
kits and other consumables.  Revenue for instruments sold to distributors is
generally recognized based upon shipping terms (either upon shipment or
delivery).

Service and Other Revenue



Service revenues are composed of contract research services, initial implied
one-year service-type warranties, extended services contracts and other services
such as training.  Contract research services are provided through our
Accelerator Laboratory and generally consist of fixed fee contracts.  Revenues
from contract research services are recognized at a point in time when we
complete and deliver our research report on each individually completed study,
or over time if the contractual provisions allow for the collection of
transaction consideration for costs incurred plus a reasonable margin through
the period of performance of the services.  Revenues from service-type
warranties are recognized ratably over the contract service period.  Revenues
from other services are immaterial.

Collaboration and License Revenue



We may enter into agreements to license the intellectual property and know-how
associated with its instruments in exchange for license fees and future
royalties (as described below).  The license agreements provide the licensee
with a right to use the intellectual property with the license fee revenues
recognized at a point in time as the underlying license is considered functional
intellectual property. We have recognized revenues from a sales- or usage based
royalties related to our licensing technology and intellectual property..

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Payment Terms

Our payment terms vary by the type and location of customer and the products or
services offered. Payment from customers is generally required in a term ranging
from 30 to 45 days from date of shipment or satisfaction of the performance
obligation with no discounts for early payment. Occasionally we do provide
extended payment terms or financing arrangements to customers.

Disaggregated Revenue



When disaggregating revenue, we considered all of the economic factors that may
affect revenues. The following tables disaggregate our revenue from contracts
with customers by revenue type:


                                                         Year Ended
                                                      December 31, 2019
(in thousands)                          NA         EMEA        Asia Pacific       Total
Product revenues
Instruments                          $  6,250    $  5,243    $         3,393    $ 14,886
Consumable and other products          14,148       9,674              1,783      25,605
Totals                               $ 20,398    $ 14,917    $         5,176    $ 40,491

Service and other revenues
Service-type warranties              $  3,139    $  1,323    $           171    $  4,633
Research services                       8,845         704                456      10,005
Other services                            825         565                 31       1,421
Totals                               $ 12,809    $  2,592    $           658    $ 16,059

Collaboration and license revenue
Collaboration and license revenue    $    167    $     17    $             -    $    184
Totals                               $    167    $     17    $             -    $    184



Our contracts with customers may include promises to transfer multiple products
and services to a customer. In accordance with ASC 606, we combine any
performance obligations that are immaterial with one or more other performance
obligations that are material to the contract. For arrangements with multiple
performance obligations, we allocate the contract transaction price, including
discounts, to each performance obligation based on its relative standalone
selling price. Judgment is required to determine the standalone selling price
for each distinct performance obligation. We determine standalone selling prices
based on prices charged to customers in observable transactions, and use a range
of amounts to estimate standalone selling prices for each performance
obligation. We may have more than one range of standalone selling price for
certain products and services based on the pricing for different customer
classes.

Variable consideration in our contracts primarily relates to (i) sales- and
usage-based royalties related to the license of intellectual property in
collaboration and license contracts and (ii) certain non-fixed fee research
services contracts. ASC 606 provides for an exception to estimating the variable
consideration for sales- and usage-based royalties related to the license of
intellectual property, such that the sales- or usage-based royalty will be
recognized in the period the underlying transaction occurs. We have recorded
sales- or usage-based royalty revenue for the year ended December 31, 2019
related to the intellectual property licensed by Uman. We recognize revenues
from sales- or usage based royalty revenue at the later of when the sales or
usage occurs; and the satisfaction or partial satisfaction of the performance
obligation to which the royalty has been allocated.

The aggregate amount of transaction price that is allocated to performance
obligations that have not yet been satisfied or are partially satisfied as of
December 31, 2019 is $5.2 million. Of the performance obligations not yet
satisfied or are partially satisfied, $4.7 million is expected to be recognized
as revenue in the next 12 months, with the remainder to be recognized within the
24 months thereafter. The $5.2 million principally consists of $3.0 million
billed

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for undelivered services related to initial and extended service-type warranties
and research services, as well as $1.7 million related to undelivered licenses
of intellectual property for a diagnostics company (see Note 2).



We have classified the balance of capitalized costs to obtain a contract as a
component of prepaid expenses and other current assets as of December 31, 2019
and classified the expense as a component of cost of goods sold and selling,
general and administrative expense over the estimated life of the contract. We
consider potential impairment in these amounts each period.



ASC 606 provides entities with certain practical expedients and accounting policy elections to minimize the cost and burden of adoption.

We exclude from the transaction price any amounts collected from customers related to sales and other similar taxes.



When determining the transaction price of a contract, an adjustment is made if
payment from a customer occurs either significantly before or significantly
after performance, resulting in a significant financing component. We do not
assess whether a significant financing component exists if the period between
when we perform our obligations under the contract and when the customer pays is
one year or less. None of our contracts contained a significant financing
component as of December 31, 2019.

We have elected to account for the shipping and handling as an activity to fulfill the promise to transfer the product, and therefore will not evaluate whether shipping and handling activities are promised services to its customers.





Stock­Based Compensation



We account for stock­based compensation awards in accordance with ASC 718,
Compensation-Stock Compensation. ASC 718 requires all stock­based payments to
employees, including grants of employee stock options, to be recognized in the
statement of operations based on their fair values. Stock­based compensation
awards have historically consisted of stock options and restricted stock.

Prior to adoption of Accounting Standards Update (ASU) No. 2016-09
Compensation-Stock Compensation (ASU 2016­09) on January 1, 2017, we recognized
compensation costs related to stock options granted to employees based on the
estimated fair value of the awards on the date of grant, net of estimated
forfeitures. Effective January 1, 2017, we ceased utilizing an estimated
forfeiture rate and began recognizing forfeitures as they occur. We estimate the
grant date fair value, and the resulting stock­based compensation expense, using
the Black­Scholes option­pricing model. The grant date fair value of the
stock­based awards is generally recognized on a straight­line basis over the
requisite service period, which is generally the vesting period of the
respective awards.

We recognize compensation costs related to share­based payments granted to
non­employees, which consist of directors for their services on our board of
directors, based on the estimated fair value of the awards on the date of grant
in the same manner as options for employees; however, the fair value of the
stock options granted to non­employees is re­measured each reporting period
until the service is complete, and the resulting increase or decrease in value,
if any, is recognized as expense or income, respectively, during the period the
related services are rendered to the same financial statement line item as any
cash consideration would be recognized. There were no material non­employee
awards outstanding during the years ended December 31, 2019, 2018, and 2017.

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The fair value of stock options granted to employees and non-employees is estimated on the grant date using the Black­Scholes option­pricing model, based on the assumptions noted in the following table:






                                            Year Ended December 31,
                                     2019             2018             2017
     Risk-free interest rate      1.4% - 2.6%      2.6% - 3.0%      1.8% - 2.1%
     Expected dividend yield         None             None             None
     Expected term (in years)         6.0              5.9              6.0
     Expected volatility         33.5% - 39.7%    32.4% - 36.8%    46.0% - 52.0%




Using the Black­Scholes option­pricing model, the weighted­average grant date
fair value of options granted for the years ended December 31, 2019, 2018, and
2017 was $9.09, $7.19, and $4.52 per share, respectively. Expected volatility
was calculated based on reported volatility data for a representative group of
guideline publicly traded companies for which historical information was
available. The risk­free interest rate is based on the U.S. Treasury yield curve
in effect at the time of grant, commensurate with the expected life assumption.
We estimate the expected life of options granted to employees utilizing the
simplified method which calculates the expected life of an option as the average
of the time to vesting and contractual life of the options. The expected life is
applied to the stock option grant group as a whole, as we do not expect
substantially different exercise or post­vesting termination behavior among our
employee population. We use the simplified method due to the lack of historical
exercise data and the plain nature of the stock options. We use the remaining
contractual term for the expected life of non­employee awards. The expected
dividend yield is assumed to be zero as we have never paid dividends and have no
current plans to pay any dividends on common stock.

For the years ended December 31, 2019, 2018, and 2017 stock­based compensation expense was $6.4 million, $4.9 million, and $2.2 million, respectively.

The table below summarizes the stock­based compensation expense recognized in our statements of operations by classification (in thousands):







                                                  Year Ended December 31,
                                                 2019        2018       2017
          Cost of product revenue              $      86    $    55    $    24
          Cost of service and other revenue          238        173         52
          Research and development                   718        513        180
          General and administrative               5,346      4,143      1,912
          Total                                $   6,388    $ 4,884    $ 2,168




As of December 31, 2019, we had $15.6 million of total unrecognized stock­based
compensation costs which we expect to recognize over a weighted­average period
of 2.77 years.

Prior to our initial public offering (IPO), the fair value of our common stock
underlying our stock options was estimated on each grant date by our board of
directors. In order to determine the fair value of our common stock underlying
granted stock options, our board of directors considered, among other things,
the most recent valuations of our common stock prepared by an unrelated
third­party valuation firm in accordance with the guidance provided by the
American Institute of Certified Public Accountants Practice Guide, Valuation of
Privately­Held­Company Equity Securities Issued as Compensation.

Given the absence of a public trading market for our common stock, our board of
directors exercised reasonable judgment and considered a number of objective and
subjective factors to determine the best estimate of the fair value of our
common stock, including (1) our business, financial condition and results of
operations, including related industry trends affecting our operations; (2) our
forecasted operating performance and projected future cash flows discounted to
present value using our estimated weighted average cost of capital; (3) the
illiquid nature of our common stock; (4) liquidation preferences and other
rights and privileges of our preferred stock over our common stock;
(5) likeliness and estimated timing of the potential option to have our stock
become publicly traded; (6) market multiples of our most

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comparable public peers; (7) recently completed equity financing transactions; and (8) market conditions affecting our industry.

Since the completion of our IPO, we have determined the fair value of each common share underlying share­based awards based on the closing price of our common shares as reported by Nasdaq on the date of grant.

Results of Operations



Comparison of the Years Ended December 31, 2019 and December 31, 2018 (dollars
in thousands):




                                             Year Ended                      Year Ended
                                           December 31,         % of       December 31,         % of          $            %
                                                2019          revenue           2018          revenue       change      change
Product revenue                           $         40,491       72 %     $         23,365       62 %     $   17,126       73 %
Service and other revenue                           16,059       28 %      

12,117 32 % 3,942 33 % Collaboration and license revenue

                      184        - %                2,150        6 %        (1,966)     (91) %
Total revenue                                       56,734      100 %               37,632      100 %         19,102       51 %
Cost of goods sold:
Cost of product revenue                             20,900       37 %               12,729       34 %          8,171       64 %
Cost of service revenue                              8,998       16 %      

6,955 18 % 2,043 29 % Total costs of goods sold and services

              29,898       53 %               19,684       52 %         10,214       52 %
Gross profit                                        26,836       47 %               17,948       48 %          8,888       50 %
Operating expenses:
Research and development                            16,190       29 %               15,805       42 %            385        2 %
Selling, general and administrative                 52,246       92 %               33,693       90 %         18,553       55 %
Total operating expense                             68,436      121 %               49,498      132 %         18,938       38 %
Loss from operations                              (41,600)     (73) %      

(31,550) (84) % (10,050) (32) % Interest income (expense), net

                         627        1 %                   46        - %  `         581    1,263 %
Other income (expense), net                           (10)        - %                  (7)        - %            (3)     (43) %
Loss before income taxes                          (40,983)     (72) %      

(31,511) (84) % (9,472) (30) % Income tax benefit (provision)

                         187        - %                 (25)        - %            212      848 %
Net loss                                  $       (40,796)     (72) %     $       (31,536)     (84) %     $  (9,260)     (29) %




Revenue

Revenue increased by $19.1 million, or 51%, to $56.7 million for the year ended
December 31, 2019 as compared to $37.6 million for the year ended December 31,
2018. Product revenue consisted of sales of instruments totaling $14.9 million
and sales of consumables and other products of $25.6 million for the year ended
December 31, 2019. Product revenue consisted of sales of instruments totaling
$9.6 million and sales of consumables and other products totaling $13.8 million
for the year ended December 31, 2018. Average sales prices of instruments and
consumables did not change materially for the year ended December 31, 2019 as
compared with the year ended December 31, 2018. The increase in product revenue
of $17.1 million was primarily due to the sale of more instruments for the year
ended December 31, 2019 and increased sales of consumables. The installed base
of instruments increased from December 31, 2018 to December 31, 2019, and as
these additional instruments were used by customers, the consumables sales
increased. The increase in service and other revenue of $3.9 million was
primarily due to increased services performed in our Accelerator Laboratory;
more customers use these services, and existing customers use these services
more frequently. In addition, an increase in purchased warranties contributed to
the service and other revenue increase. Collaboration and license revenue for
the year ended December 31, 2019 of $0.2 million was related to licensing
technology and intellectual property. Collaboration and license revenue for the
year ended December 31, 2018 of $2.2 million was related to the termination of
the collaboration arrangement with bioMérieux.

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Cost of Goods Sold and Services



Cost of product revenue increased by $8.2 million, or 64%, to $20.9 million for
the year ended December 31, 2019 as compared to $12.7 million for the year ended
December 31, 2018. The increase was primarily due to an increase in sales of
consumables and instruments, along with costs incurred from the amortization of
the Uman acquisition-related inventory valuation adjustment and acquired
intangibles. Cost of service revenue increased to $9.0 million for the year
ended December 31, 2019 from $7.0 million for the year ended December 31, 2018.
The increase was primarily due to higher utilization of the Accelerator
Laboratory, plus increased personnel costs from the build out of our field
service and Accelerator organization. Overall cost of goods sold and services as
a percentage of revenue increased slightly to 53% of total revenue for the year
ended December 31, 2019 as compared to 52% for the year ended December 31, 2018,
primarily as a result of the impact of the collaboration arrangement with
bioMérieux during the year ended December 31, 2018 and the impact of the Uman
acquisition-related charges during the year ended December 31, 2019.

Research and Development Expense



Research and development expense increased slightly by $0.4 million, or 2%, to
$16.2 million for the year ended December 31, 2019 as compared to $15.8 million
for the year ended December 31, 2018. The increase was primarily due to the
development of the SP-X and HD-X and increased headcount in research and
development.

Selling, General and Administrative Expense



Selling, general and administrative expense increased by $18.6 million, or 55%,
to $52.2 million for the year ended December 31, 2019 as compared to
$33.7 million for the year ended December 31, 2018. The increase was primarily
due to headcount additions in various departments as we build out our
organization to support future growth, public company costs, the lease for the
new headquarters, and stock-based compensation expense. In addition, we incurred
approximately $1.9 million in costs associated with the acquisition of Uman
during the year ended December 31, 2019.

Interest Income (Expense), Net and Other Income (Expense), Net



Interest income (expense), net and other income (expense), net increased
by $0.6 million for the year ended December 31, 2019 as compared to the same
period in 2018, primarily due to the interest income earned on cash equivalents,
which increased due to our "at-the-market" and underwritten public offerings
completed during 2019.

Income Tax Benefit (Provision)



Income tax benefit was $0.2 million for the year ended December 31, 2019 as
compared to a provision of less than $0.1 million for the same period in 2018.
The increase is primarily due to certain state and international taxes in 2019,
which we did not have in the prior year.

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Comparison of the Years Ended December 31, 2018 and December 31, 2017 (dollars
in thousands):




                                             Year Ended                     Year Ended
                                           December 31,         % of      December 31,         % of         $          %
                                                2018          revenue          2017          revenue     change     change
Product revenue                           $         23,365       62 %    $         14,124       62 %    $   9,241      65 %
Service and other revenue                           12,117       32 %               7,676       34 %        4,441      58 %
Collaboration and license revenue                    2,150        6 %               1,074        5 %        1,076     100 %
Total revenue                                       37,632      100 %              22,874      100 %       14,758      65 %
Costs of goods sold:
Cost of product revenue                             12,729       34 %               7,742       34 %        4,987      64 %
Cost of services revenue                             6,955       18 %               5,145       22 %        1,810      35 %
Total costs of goods sold and services              19,684       52 %              12,887       56 %        6,797      53 %
Gross profit                                        17,948       48 %               9,987       44 %        7,961      80 %
Operating expenses:
Research and development                            15,805       42 %              16,304       71 %        (499)     (3) %
Selling, general and administrative                 33,693       90 %              19,688       86 %       14,005      71 %
Total operating expenses                            49,498      132 %              35,992      157 %       13,506      38 %
Loss from operations                              (31,550)     (84) %            (26,005)    (114) %      (5,545)    (21) %
Interest income (expense), net                          46        - %               (951)      (4) %          997     105 %
Other income (expense), net                            (7)        - %                (63)        - %           56      89 %
Loss before income taxes                          (31,511)     (84) %            (27,019)    (118) %      (4,492)    (17) %
Income tax benefit (provision)                        (25)        - %                   -        - %         (25)   (100) %
Net loss                                  $       (31,536)     (84) %    $       (27,019)    (118) %    $ (4,517)    (17) %




Revenue

Revenue increased by $14.8 million, or 65%, to $37.6 million for the year ended
December 31, 2018 as compared to $22.9 million for the year ended December 31,
2017. Product revenue consisted of sales of instruments totaling $9.6 million
and sales of consumables and other products of $13.8 million for the year ended
December 31, 2018. Product revenue consisted of sales of instruments totaling
$6.5 million and sales of consumables and other products totaling $7.6 million
for the year ended December 31, 2017. Average sales prices of instruments and
consumables did not change materially in the year ended December 31, 2018 as
compared with the year ended December 31, 2017. The increase in product revenue
of $9.2 million was primarily due to the sale of more instruments in the year
ended December 31, 2018 and increased sales of consumables. The installed base
of Simoa instruments increased from December 31, 2017 to December 31, 2018, and
as these additional instruments were used by customers, the consumables sales
increased. The increase in service and other revenue of $4.4 million was due to
increased services performed in our Accelerator Laboratory; more customers are
using these services, and existing customers are using the Accelerator
Laboratory more frequently. In addition, an increase in purchased warranties
contributed to the service and other revenue increase. Collaboration and license
revenue in the year ended December 31, 2018 included $2.1 million in revenue
related to the termination of the collaboration arrangement with bioMérieux in
the third quarter of 2018.

Cost of Goods Sold and Services



Cost of product revenue increased by $5.0 million, or 64%, to $12.7 million for
the year ended December 31, 2018 as compared to $7.7 million for the year ended
December 31, 2017. The increase was primarily due to increased sales of
consumables and instruments. Cost of service revenue increased to $7.0 million
for the year ended December 31, 2018 from $5.1 million for the year ended
December 31, 2017. The increase was primarily due to higher utilization of the
Accelerator Laboratory, plus increased personnel costs from the build out of our
field service organization. Overall cost of goods sold and services as
a percentage of revenue decreased to  52% of total revenue for the year ended
December 31, 2018 as compared to 56% for the year ended December 31, 2017,
primarily as a result of the change in revenue mix to more consumables revenue
and collaboration revenue in 2018.

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Research and Development Expense



Research and development expense decreased slightly by $0.5 million, or 3%, to
$15.8 million for the year ended December 31, 2018 as compared to $16.3 million
for the year ended December 31, 2017. The decrease was primarily due to a
reduction in outside development costs related to our SR­X instrument for which
development was completed and product launched commercially in the fourth
quarter of 2017. The reduction in project costs for the SR­X instrument offset
an increase in research and development costs due to increased headcount in
research and development and the increased use of outside development firms as
we increased our new product development efforts.

Selling, General and Administrative Expense



Selling, general and administrative expense increased by $14.0 million, or 71%,
to $33.7 million for the year ended December 31, 2018 as compared to
$19.7 million for the same period in 2017. The increase was primarily due to
headcount additions in various departments as we build out our organization to
support future growth, public company costs, transaction fees, and amortization
of intangibles associated with the Aushon acquisition, and stock compensation
expense.

Interest Income (Expense), Net and Other Income (Expense), Net



Interest income (expense), net and other income (expense), net increased by
$1.1 million, to a net income position of less than $0.1 million for the year
ended December 31, 2018 as compared to $1.0 million of net expense for the same
period in 2017, primarily due to an increase in the interest income as a result
of the higher cash balance in 2018.

Income Tax Benefit (Provision)



Tax provision increased by less than $0.1 million to an amount less $0.1 million
for the year ended December 31, 2018. The increase is primarily due to certain
state taxes in 2018, which we did not have in the prior year.

Liquidity and Capital Resources



Since our inception, we have incurred net losses and negative cash flows from
operations. We incurred net losses of $40.8 million, $31.5 million and
$27.0 million and used $26.2 million, $28.7 million and $22.1 million of cash
from our operating activities for the years ended December 31, 2019, 2018, and
2017, respectively. As of December 31, 2019, we had an accumulated deficit of
$216.2 million.

As of December 2019, we had cash and cash equivalents of $109.2 million and no additional amounts were available to borrow under our debt facility.

Sources of Liquidity

To date, we have financed our operations principally through equity offerings, borrowings from credit facilities and revenue from our commercial operations.

Equity Offerings



In December 2017, we completed our IPO in which we sold 4,916,480 shares of
common stock at an initial public offering price of $15.00 per share. The
aggregate net proceeds received by us from the offering, net of underwriting
discounts and commissions and offering expenses, were $65.6 million. Prior to
the IPO, we had raised capital through the sale of redeemable convertible
preferred stock in private placement transactions.

On March 19, 2019, we entered into a Sales Agreement for an "at-the-market
offering" arrangement with Cowen, which allows us to issue and sell shares of
common stock pursuant to a shelf registration statement for total gross sales
proceeds of up to $50.0 million from time to time through Cowen, acting as our
agent. During the nine

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months ended September 30, 2019, we sold an aggregate of 2,186,163 shares of common stock pursuant to this agreement resulting in $49.7 million in gross proceeds and $48.0 million in net proceeds.



On August 8, 2019, we entered into an underwriting agreement with J.P. Morgan
Securities LLC and SVB Leerink LLC, as representatives of the several
underwriters, relating to an underwritten public offering of 2,732,673 shares of
common stock at a public offering price of $25.25 per share. We received $69.0
million in gross proceeds and $64.5 million in net proceeds.



Loan Facility with Hercules



On April 14, 2014, we executed a Loan Agreement with Hercules Capital, Inc.
(formerly known as Hercules Technology Growth Capital, Inc.), as subsequently
amended, most recently in April 2019. The Loan Agreement provided a total debt
facility of $10.0 million, which is secured by substantially all of our assets.
At closing, we borrowed $5.0 million in principal and had the ability to draw
the additional $5.0 million over the period from November 1, 2014 to March 31,
2015. The interest rate on this term loan was variable based on a calculation of
8% plus the prime rate less 5.25%, with a minimum interest rate of 8%. Interest
was to be paid monthly beginning the month following the borrowing date.
Principal payments were scheduled to begin on September 1, 2015, unless we
achieved certain milestones which would have extended this date to December 1,
2015 or March 1, 2016. In connection with the execution of the Loan Agreement,
we issued Hercules a warrant to purchase up to 173,428 shares of our Series C
Preferred Stock at an exercise price of $3.3299 per share. Upon closing of the
IPO, this warrant was automatically converted into a warrant to purchase up to
53,960 shares of our common stock at an exercise price of $10.70 per share.

In August 2018, we signed Amendment 5 to the Loan Agreement, which extends the
interest only payment period through March 1, 2020 and also extends the loan
maturity date to March 1, 2020. We accounted for the August 2018 amendment as a
modification pursuant to ASC 470­50 and determined that no material change
occurred as a result of the modification. In addition, the amendment deferred
the payment of principal until the maturity date. $0.1 million of end of term
payments are due March 2020.

In October 2018, we signed Amendment 6 to the Loan Agreement, which amends the
Loan Agreement's collateral clause to exclude the $1 million certificate of
deposit associated with the lease on our new headquarters in Billerica,
Massachusetts. The Loan Agreement and amendments contain end of term payments
and are recorded in the debt accounts. $0.5 million of end of term payments were
paid during the year ended December 31, 2018.

On April 15, 2019, we entered into Amendment No. 7 to the Loan Agreement, which
extends the interest only payment period through July 1, 2021 and also extends
the loan maturity date to October 1, 2021. We are required to pay the loan
principal in five equal installments starting July 1, 2021 with the final
principal payment to be made on October 1, 2021.

On July 2, 2019, 66,041 warrants were exercised by Hercules on a net, non-cash,
basis. Per the terms of the warrant agreement, we issued 45,690 shares of common
stock as a result of the net exercise. The Loan Agreement and amendments contain
end of term payments and are recorded in the debt accounts. No end of term
payments were paid in the year ended December 31, 2019.

The Loan Agreement contains negative covenants restricting our activities,
including limitations on dispositions, mergers or acquisitions, incurring
indebtedness or liens, paying dividends or making investments and certain other
business transactions. There are no financial covenants associated with the Loan
Agreement. The obligations under the Loan Agreement are subject to acceleration
upon the occurrence of specified events of default, including a material adverse
change in our business, operations or financial or other condition, which is
subjective in nature. We have determined that the risk of subjective
acceleration under the material adverse events clause is not probable and
therefore have classified the outstanding principal in current and long­term
liabilities based on scheduled principal payments.

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Debt principal repayments, including the end of term fees, due as of December 31, 2019 are (in thousands):






                       Years ending December 31,
                       2020                          $    75
                       2021                            7,738
                                                     $ 7,813




Uman Acquisition



In August 2019, we completed the acquisition of Uman, in which we paid $15.7
million in cash to the shareholders of Uman. We funded this payment through our
existing cash balances. In addition, we issued $5.5 million in stock in
connection with the purchase of Uman. The acquisition closed with respect to 95%
of the outstanding shares of capital stock of Uman on July 1, 2019 and with
respect to the remaining 5% of the outstanding shares of capital stock of Uman
on August 1, 2019.



Cash Flows

The following table presents our cash flows for each period presented (in
thousands):




                                                              Year Ended December 31,
                                                           2019          2018         2017
Net cash used in operating activities                   $ (26,187)    $ (28,721)   $ (22,106)
Net cash used in investing activities                     (25,376)       (5,454)      (1,132)
Net cash provided by (used in) financing activities        116,197          (78)       73,249
Net increase (decrease) in cash and cash equivalents    $   64,634    $ (34,253)   $   50,011

Net Cash Used in Operating Activities



We derive cash flows from operations primarily from the sale of our products and
services. Our cash flows from operating activities are also significantly
influenced by our use of cash for operating expenses to support the growth of
our business. We have historically experienced negative cash flows from
operating activities as we have developed our technology, expanded our business
and built our infrastructure and this may continue in the future.

Net cash used in operating activities was $26.2 million during the year ended
December 31, 2019. Net cash used in operating activities primarily consisted of
net loss of $40.8 million offset by non-cash charges of $6.4 million of
stock-based compensation expense,  $3.0 million of depreciation and amortization
expense, and $0.6 of inventory valuation adjustment amortization.  Cash provided
as a result of changes in operating assets and liabilities of $4.4 million was
primarily due to a $9.8 million increase in other non-current liabilities
related to our new lease, offset by an increase in accounts receivable of $3.4
million, and an increase in inventory of $3.4 million.

Net cash used in operating activities was $28.7 million during the year ended
December 31, 2018. Net cash used in operating activities primarily consisted of
net loss of $31.5 million, a decrease of $1.9 million in deferred revenue and an
increase of $1.6 million in inventory, primarily offset by non­cash stock
compensation expense of $4.9 million and an increase of $1.3 million in accounts
payable.

Net cash used in operating activities was $22.1 million during the year ended
December 31, 2017. Net cash used in operating activities primarily consisted of
net loss of $27.0 million and an increase of $2.0 million in inventory and an
increase in accounts receivable of $1.7 million, primarily offset by non-cash
stock compensation expense of $2.2 million, an increase of $2.9 million in
deferred revenue, an increase of $2.0 million in accrued expenses and an
increase of $1.0 million in accounts payable.

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Net Cash Used in Investing Activities

Historically, our primary investing activities have consisted of capital expenditures for the purchase of capital equipment to support our expanding infrastructure and work force. We expect to continue to incur additional costs for capital expenditures related to these efforts in future periods.

We used $25.4 million of cash in investing activities during the year ended December 31, 2019. The significant increase was related to the cash portion of the Uman acquisition, as well as the leasehold improvements for new headquarters, which is a component of our lease agreement.

We used $5.5 million of cash in investing activities during the year ended December 31, 2018 consisting of cash paid in the acquisition of Aushon, net of cash acquired, and for purchases of capital equipment to support our infrastructure.

We used $1.1 million of cash in investing activities during the year ended December 31, 2017 for purchases of capital equipment to support our infrastructure.

Net Cash Provided by (Used in) Financing Activities

Historically, we have financed our operations principally through private placements of our convertible preferred stock and borrowings from credit facilities, the sale of shares of our common stock in our IPO or other offerings and revenues from our commercial operations.

Financing activities provided $116.2 million of cash during the year ended December 31, 2019, primarily from proceeds of our "at-the-market" offering during the second quarter of 2019 and our underwritten public offering during the third quarter of 2019.

We used $0.1 million cash in financing activities during the year ended December 31, 2018, which primarily was from payments on debt of $1.9 million offset by cash generated by the exercise of stock options.



 We generated $73.2 million of cash in financing activities during the year
ended December 31, 2017, which primarily was from the sale of 4,916,480 shares
of common stock in our IPO in December 2017 for net proceeds of $65.6 million,
and the sale of 2,113,902 shares of our Series D-1 Preferred Stock in June 2017
for net proceeds of $8.4 million, which was partially offset by payments of
outstanding debt.

Capital Resources



We have not achieved profitability on a quarterly or annual basis since our
inception, and we expect to continue to incur net losses in the future. We also
expect that our operating expenses will increase as we continue to increase our
marketing efforts to drive adoption of our commercial products. Additionally, as
a public company, we have incurred and will continue to incur significant audit,
legal and other expenses that we did not incur as a private company. Our
liquidity requirements have historically consisted, and we expect that they will
continue to consist, of sales and marketing expenses, research and development
expenses, working capital, debt service and general corporate expenses.

We believe cash generated from commercial sales, our current cash and cash
equivalents, and interest income we earn on these balances will be sufficient to
meet our anticipated operating cash requirements for the next 12 months. In the
future, we expect our operating and capital expenditures to increase as we
increase headcount, expand our sales and marketing activities and grow our
customer base. Our estimates of the period of time through which our financial
resources will be adequate to support our operations and the costs to support
research and development and our sales and marketing activities are
forward­looking statements and involve risks and uncertainties and actual
results could vary materially and negatively as a result of a number of factors,
including the factors discussed in Item 1A, "Risk Factors" of this Annual Report
on Form 10­K. We have based our estimates on assumptions that may prove to be
wrong and we

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could utilize our available capital resources sooner than we currently expect. Our future funding requirements will depend on many factors, including:

· market acceptance of our products, including our SP­X, SR-X and HD-X

instruments;

· the cost and timing of establishing additional sales, marketing and

distribution capabilities;

· the cost of our research and development activities;

· our ability to enter into collaborations in the future, and the success of any

such collaborations;

· the cost and timing of potential regulatory clearances or approvals that may be

required in the future for our products; and

· the effect of competing technological and market developments.






We cannot assure you that we will be able to obtain additional funds on
acceptable terms, or at all. If we raise additional funds by issuing equity or
equity­linked securities, our stockholders may experience dilution. Future debt
financing, if available, may involve covenants restricting our operations or our
ability to incur additional debt. Any debt or equity financing that we raise may
contain terms that are not favorable to us or our stockholders. If we raise
additional funds through collaboration and licensing arrangements with third
parties, it may be necessary to relinquish some rights to our technologies or
our products, or grant licenses on terms that are not favorable to us. If we do
not have or are not able to obtain sufficient funds, we may have to delay
development or commercialization of our products. We also may have to reduce
marketing, customer support or other resources devoted to our products or cease
operations.

If the conditions for raising capital are favorable, we may seek to finance
future cash needs through public or private equity or debt offerings or other
financings. On March 19, 2019, we filed a universal shelf registration statement
on Form S-3, which was declared effective by the SEC on May 10, 2019, and
pursuant to which we registered for sale up to $200 million of any combination
of our common stock, preferred stock, debt securities, warrants, rights, and/or
units from time to time and at prices and on terms that we may determine. After
the sales of shares of common stock in our "at-the-market" offering during June
2019, and the sale of 2,732,673 shares of common stock in our underwritten
public offering in August 2019, approximately $81.3 million of securities
remained available for issuance under this shelf registration statement. This
registration statement will remain in effect up to May 10, 2022.

Off­Balance Sheet Arrangements

We did not have, during the periods presented, and we do not currently have, any off­balance sheet arrangements, as defined under applicable SEC rules.

Contractual Obligations, Commitments and Contingencies

Loan Facility with Hercules

On April 14, 2014, we executed a Loan Agreement with Hercules Capital, Inc. (formerly known as Hercules

Technology Growth Capital, Inc.), as subsequently amended, most recently in
April 2019. The Loan Agreement provided a total debt facility of $10.0 million,
which is secured by substantially all of our assets. At closing, we borrowed
$5.0 million in principal and had the ability to draw the additional $5.0
million over the period from November 1, 2014 to March 31, 2015. The interest
rate on this term loan was variable based on a calculation of 8% plus the prime
rate less 5.25%, with a minimum interest rate of 8%. Interest was to be paid
monthly beginning the month following the borrowing date. Principal payments
were scheduled to begin on September 1, 2015, unless we achieved certain
milestones which would have extended this date to December 1, 2015 or March 1,
2016. In connection with the execution of the Loan Agreement, we issued Hercules
a warrant to purchase up to 173,428 shares of our Series C Preferred Stock at an
exercise price of $3.3299 per share. Upon closing of the IPO, this warrant was
automatically converted into a warrant to purchase up to 53,960 shares of our
common stock at an exercise price of $10.70 per share.



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The following table summarizes our contractual obligations as of December 31,
2019 (in thousands):




                                                                 Payments due by period
                                               Less than      1 to 3     3 to 5      More than
(in thousands)                                  1 Year        years       years       5 years       Total
Contractual Obligations:(1)
Operating lease obligations                   $     2,081    $  6,718    $ 7,037    $    22,203    $ 38,039
Principal payments and end of term fees on
the term loan                                          75       7,738          -              -       7,813
Total                                         $     2,156    $ 14,456    $ 7,037    $    22,203    $ 45,852

--------------------------------------------------------------------------------

(1) See "Development and Supply Agreement" for additional contractual

obligations.




We currently lease approximately 91,600 square feet of office, laboratory, and
manufacturing space at our headquarters in Billerica, Massachusetts. The
premises covered by this new lease serves as our principal office and laboratory
space effective the second quarter of 2019. The initial term of the lease is
11 years and five months beginning on April 1, 2019, and we have the option to
extend the lease for two additional five­year periods.

We previously leased approximately 30,655 square feet of office, laboratory, and
manufacturing space as our headquarters in Lexington, Massachusetts, which was
to expire on June 30, 2020; however in November 2018, we agreed to terminate the
lease with the lessor effective May 2019. The termination of the lease was
connected to us signing the new lease in October 2018 for our new headquarters
in Billerica. In addition, pursuant to our acquisition of Aushon in
January 2018, we assumed a lease of approximately 21,500 square feet of office,
laboratory, and manufacturing space in Billerica, Massachusetts, under a lease
that was to expire on February 28, 2021; however, in August 2018, we exercised
an option to terminate the lease effective as of September 1, 2019. We paid a
termination fee of $75,000 in  February 2019 in consideration for the early
termination.


In addition, our subsidiary, Uman, leases a total of approximately 6,500 square feet of office, laboratory, manufacturing and storage space in Umeå, Sweden.

These leases expire at various dates between May 31, 2020 and February 28, 2023.





We also have ongoing obligations related to license agreements which contain
immaterial minimum annual payments that are credited against the actual royalty
expense.



Purchase orders or contracts for the purchase of supplies and other goods and
services are not included in the table above. We are not able to determine the
aggregate amount of such purchase orders that represent contractual obligations,
as purchase orders may represent authorizations to purchase rather than binding
agreements. Our purchase orders are based on our current procurement or
development needs and are fulfilled by our vendors within short time horizons.

Development and Supply Agreement



We do not have significant agreements, with the exception of the supply
agreement with STRATEC, for the purchase of supplies or other goods specifying
minimum quantities or set prices that exceed our expected requirements for the
next three to six months. STRATEC manufactured our HD­1 instrument and
manufactures the HD­X that we commercialized in the second half of 2019. In
2013, we entered into the Supply Agreement with STRATEC which requires us to
purchase a minimum number of commercial units over a seven­year period ending in
May 2021. We could be obligated to pay a fee based on the shortfall of
commercial units purchased compared to the required number. Based on the
commercial units purchased as of December 31, 2019,  assuming no additional
commercial units were purchased thereafter but prior to May 2021, this fee would
equal $9.6 million. The amount we could be obligated to pay under the minimum
purchase commitment is reduced as each commercial unit is purchased. We believe
that we will purchase sufficient units to meet the requirements of the minimum
purchase commitment and, therefore, have not accrued for any of the minimum
purchase commitment.

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Also, if we terminate the Supply Agreement under certain circumstances and do
not purchase up to a required number of commercial units, we would be required
to issue warrants to purchase 93,341 shares of common stock at $0.003214 per
share. We believe that we will not issue such warrants and therefore have not
recorded any amounts related to the potential equity consideration.

In August 2011, we entered into the Development Agreement with STRATEC, pursuant
to which STRATEC undertook the development of the HD­1 for manufacture and sale
to us or a partner whom we designate. During the year ended December 31, 2016,
the Development Agreement was amended to modify the deliverables related to the
final milestone, to agree on instrument design changes to be implemented, and to
reduce the minimum purchase commitment in the Supply Agreement. Additionally,
the parties agreed on additional development services for a total fee of
$1.5 million, which is payable when development is completed and of which
$0.9 million was paid in 2018 and $0.6 million was paid in 2019. The total
amount included the final milestone payment that was due under the terms of the
original agreement.

Backlog

We generally expect to ship all instrument and consumable orders received in a given period with the exception of orders received near the end of a fiscal quarter; and as a result, our backlog at the end of any period is typically insignificant.

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