The following discussion and analysis of our financial condition and results of
operations should be read in conjunction with our consolidated financial
statements and the related notes and other financial information included
elsewhere in this Annual Report on Form 10-K and our final prospectus filed with
the Securities and Exchange Commission (the "SEC") pursuant to Rule 424(b) under
the Securities Act of 1933, as amended, on June 20, 2019 (the "Prospectus"). In
addition to historical consolidated financial information, the following
discussion contains forward-looking statements that reflect our plans,
estimates, and beliefs. Our actual results could differ materially from those
discussed in the forward-looking statements. You should review the sections
titled "Special Note Regarding Forward-Looking Statements" for a discussion of
forward-looking statements and in Part I, Item 1A, "Risk Factors" for a
discussion of factors that could cause actual results to differ materially from
the results described in or implied by the forward-looking statements contained
in the following discussion and analysis and elsewhere in this Annual Report on
Form 10-K and in our Prospectus.

This section of this Form 10-K generally discusses 2019 and 2018 items and
year-to-year comparisons between 2019 and 2018. Discussions of 2017 items and
year-to-year comparisons between 2018 and 2017 that are not included in this
Form 10-K can be found in "Management's Discussion and Analysis of Financial
Condition and Results of Operations" in our Prospectus.

Overview



We are a growing cancer genomics company transforming the development of
next-generation therapies by providing more comprehensive molecular data about
each patient's cancer and immune response. We designed our NeXT Platform to
adapt to the complex and evolving understanding of cancer, providing our
biopharmaceutical customers with information on all of the approximately 20,000
human genes, together with the immune system, in contrast to many cancer panels
that cover roughly 50 to 500 genes. In parallel with the development of our
platform technology, we have also provided population sequencing services under
contract with the U.S. Department of Veterans Affairs (the "VA") Million Veteran
Program (the "VA MVP"), which has enabled us to innovate, scale our operational
infrastructure, and achieve greater efficiencies in our lab.



We are also developing a complementary liquid biopsy assay that analyzes all of
the approximately 20,000 human genes versus the more narrowly focused liquid
biopsy assays that are currently available. By combining technological
innovation, operational scale, and regulatory differentiation, our NeXT Platform
is designed to help our customers obtain new insights into the mechanisms of
response and resistance to therapy as well as new potential therapeutic targets.
Our platform enhances the ability of biopharmaceutical companies to unlock the
potential of conducting translational research in the clinic rather than with
pre-clinical animal models or cancer cell lines. We also announced in January
2020 a diagnostic based on our NeXT Platform that we envision being used
initially by both leading clinical cancer centers as well as biopharmaceutical
companies.

We generated revenues of $65.2 million, $37.8 million, and $9.4 million for the
years ended December 31, 2019, 2018, and 2017, respectively. In 2019, 67% of our
revenues were generated from the U.S. Department of Veterans Affairs (the "VA")
Million Veteran Program (the "VA MVP") as compared to 49% in 2018. Non-VA MVP
revenues increased by 13% in 2019 compared to 2018. We also incurred net losses
of $25.1 million, $19.9 million and $23.6 million for the years ended December
31, 2019, 2018, and 2017, respectively.

As of December 31, 2019, we had $128.3 million in cash and cash equivalents, and
short-term investments. From inception through December 31, 2019, we have funded
our operations primarily through cash from operations, redeemable convertible
preferred stock issuances, debt issuances, and proceeds from our initial public
offering. We expect that our existing cash and cash equivalents, and short-term
investments will provide sufficient funds to sustain operations through at least
the next 12 months. We have based these estimates on assumptions that may prove
to be wrong, and we could exhaust our available capital resources sooner than we
expect.

Factors Affecting Our Performance

We believe there are several important factors that have impacted, and that we expect will continue to impact, our operating performance and results of operations, including:

• The continued development of the market for genomic-based tests. Our

performance depends on the willingness of biopharmaceutical customers to

continue to seek more comprehensive molecular information to develop more


         efficacious cancer therapies.


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• Increasing adoption of our products and solutions by existing customers.

Our performance depends on our ability to retain and broaden adoption

with existing customers. Because our technology is novel, some customers

begin using our platform by initiating pilot studies involving a small

number of samples to gain experience with our service. As a result,

historically a significant portion of our revenues has come from existing

customers. We believe that our ability to convert initial pilots into

larger orders from existing customers has the potential to drive

substantial long-term revenue. We expect there may be some variation in


         the number of samples they choose to test each quarter.


      •  Adoption of our products and solutions by new customers. While new
         customers initially may not account for significant revenues, we believe
         that they have the potential to grow substantially over the long term as

they gain confidence in our service. Our ability to engage new customers


         is critical to our long-term success. Our publications, posters and
         presentations at scientific conferences lead to engagement at the
         scientific level with potential customers who often make the initial
         decision to gain experience with our platform. Accessing these new
         customers through scientific engagement and marketing to gain initial
         buy-in is critical to our success and gives us the opportunity to
         demonstrate the utility of our platform.

• Our revenues and costs are affected by the volume of samples we receive

from customers from period to period. The timing and size of sample

shipments received after orders have been placed is variable. Since

sample shipments can be large, and are often received from a third party,

the timing of arrival can be difficult to predict over the short term.

Although our long-term performance is not affected, we do see

quarter-to-quarter volatility due to these factors. Samples arriving

later than expected may not be processed in the quarter proposed and

result in revenue the following quarter. Since many of our customers


         request defined turnaround times, we employ project managers to
         coordinate and manage the complex process from sample receipt to
         sequencing and delivery of results.

• Investment in product innovation to support commercial growth. Investment

in research and development, including the development of new products is

critical to establish and maintain our leading position. In particular,

we have invested in NeoantigenID, a neoantigen characterization report,

ImmunogenomicsID, a broad biomarker report, and ImmunoID NeXT, our

universal cancer immunogenomics platform. We are also collaborating with


         key opinion leaders from academic cancer centers, such as Inova Health
         System, Stanford Medicine, and the Parker Institute for Cancer
         Immunotherapy, to support the utility of our platform. We believe this

work is critical to gaining customer adoption and expect our investments

in these efforts to increase. We believe utility for our product may

result in additional expenditures to develop and market new products,

including a diagnostic or database.

• Leverage our operational infrastructure. We have invested significantly,


         and will continue to invest, in our sample processing capabilities and
         commercial infrastructure. With our current operating model and
         infrastructure, we can increase our production and commercialize new

generations of our platform, but as our volumes continue to increase we

will ultimately need to invest in additional production capabilities. We

expect to grow our revenues and spread our costs over a larger volume of


         services. In addition, we may invest significant amounts in
         infrastructure to support new products resulting from our research and
         development activities.


In addition to the factors described above, as our headquarters and laboratory
operations are located in San Mateo County, California, our operations have been
impacted by the ongoing COVID-19 pandemic. On March 16, 2020, the Health Officer
of the County of San Mateo (the "Health Officer") issued a shelter-in-place
order (the "San Mateo Order"), which directed all businesses to cease
non-essential operations at physical locations in the county. The San Mateo
Order also directed all individuals living in the county to shelter at their
place of residence with limited exceptions. The intent of the San Mateo Order is
to slow the spread of COVID-19 to the maximum extent possible. The San Mateo
Order became effective on March 17, 2020 and will continue to be in effect
through April 7, 2020, or until it is extended, rescinded, superseded, or
amended in writing by the Health Officer. Similar orders were issued in
neighboring counties, including Santa Clara County, such that the substantial
majority of our employees are subject to a shelter-in-place order. While the San
Mateo Order allows for continued operation of so-called Essential Businesses,
which includes certain critical healthcare operations and services, to comply
with the San Mateo Order, we are prioritizing the fulfillment of customer orders
to those related to time-sensitive healthcare projects, such as in-process
clinical trials, and will fulfill other customer orders to the extent we have
the ability to do so with limited laboratory staffing. In addition, on March 19,
2020, the Governor of California and the State Public Health Officer and
Director of the California Department of Public Health ordered all individuals
living in the State of California to stay at their place of residence for an
indefinite period of time (subject to certain exceptions to facilitate
authorized necessary activities) to mitigate the impact of the COVID-19 pandemic
(the "California Order" and, together with the San Mateo Order, the "Orders").
Other states in the United States, including Massachusetts and New York, have
followed suit by issuing orders with similar goals and restrictions.

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Beyond the immediate impact of the Orders to our operations, the ongoing
COVID-19 pandemic, the Orders, and similar orders issued by other authorities to
impose restrictions intended to mitigate the impact of the COVID-19 pandemic,
may disrupt our supply chain, including our ability to acquire raw materials,
disrupt customer demand, reduce our ability to receive customer samples on a
normal basis, disrupt our customer and vendor relationships, divert management
attention, and negatively impact employee productivity due to work-from-home
policies. The scope and duration of such impact is highly uncertain. We are
unable to predict or quantify the impact of any potential disruption to our
supply chain, changes in consumer demand, or any other actions that may become
necessary as events unfold.

Components of Operating Results

Revenues



We derive our revenues primarily from sequencing and data analysis services to
support the development of next-generation cancer therapies and to support large
scale genetic research programs. We support our customers by providing
high-accuracy, validated genomic sequencing and advanced analytics. Many of
these analytics are related to state-of-the-art biomarkers, including those
relevant to immuno-oncology therapeutics such as checkpoint inhibitors.

Our revenues are primarily generated through contracts with companies in the
pharmaceutical industry, healthcare organizations, and government entities. Our
ability to increase our revenues will depend on our ability to further penetrate
this market. To do this, we are developing a growing set of additional
state-of-the-art products, advancing our operational infrastructure, building
our regulatory credentials and expanding our targeted marketing efforts. Unlike
diagnostic or therapeutic companies, we have not to date sought reimbursement
through traditional healthcare payors. We sell through a small direct sales
force.

We have one reportable segment from the sale of sequencing and data analysis
services. Substantially all of our revenues to date have been derived from sales
in the United States.

Costs and Expenses

Costs of revenues

Costs of revenues consist of production material costs, personnel costs
(salaries, bonuses, benefits, and stock-based compensation), costs of
consumables, laboratory supplies, depreciation and service maintenance on
capitalized equipment, and information technology ("IT") and facility costs. We
expect the costs of revenues to increase as our revenues grow, but the cost per
unit of data delivered to decrease over time due to economies of scale we may
gain as volume increases, automation initiatives, and other cost reductions.

Research and development expenses



Research and development expenses consist of costs incurred for the development
of our products. These expenses consist primarily of payroll and personnel costs
(salaries, bonuses, benefits, and stock-based compensation), costs of
consumables, laboratory supplies, depreciation and service maintenance on
capitalized equipment, and IT and facility costs. These expenses also include
costs associated with our collaborations, which we expect to increase over time.

We expense our research and development expenses in the period in which they are incurred. We expect to increase our research and development expenses as we continue to develop new products.

Selling, general, and administrative expenses



Selling expenses consist of personnel costs, customer support expenses, direct
marketing expenses, educational and promotional expenses, and market research.
Our general and administrative expenses include costs for our executive,
accounting, finance, legal, and human resources functions. These expenses
consist of personnel costs, audit and legal expenses, consulting costs, and IT
and facility costs. We expense all selling, general, and administrative expenses
as incurred.

We expect our selling expenses will continue to increase in absolute dollars,
primarily driven by our efforts to expand our commercial capability and to
expand our brand awareness and customer base through targeted marketing
initiatives with an increased presence both within and outside the United
States. We also expect general and administrative expenses will increase as we
scale our operations.

Interest Income

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Interest income consists primarily of interest earned on our cash and cash
equivalents, and short-term investments. Interest income increased significantly
in 2019 as a result of us investing proceeds from the IPO. We expect a continued
higher level of interest income in 2020 for this reason.

Interest Expense



Interest expense primarily consists of cash and non-cash interest costs related
to our term loan, convertible promissory notes, revolving loan, and growth
capital loan. We record costs incurred in connection with the issuance of debt
as a direct deduction from the debt liability. We amortize these costs over the
term of our debt agreements as interest expense in our consolidated statements
of operations. After the payoff of our growth capital loan in August 2019, we no
longer have any outstanding debt and have not incurred interest expense from
that point forward.

Loss on Debt Extinguishment

We incurred loss on debt extinguishment in 2018 resulting from changes in the
maturity dates of the convertible notes issued in 2017. We also incurred loss on
debt extinguishment in 2019 upon the payoff of the growth capital loan. See Note
6 to our consolidated financial statements included elsewhere in this annual
report.

Other (Expense) Income, Net

Other (expense) income, net consists of changes in the fair value of the
compound derivative instrument, changes in fair value of convertible preferred
stock warrant liability, and foreign currency exchange gains and losses. Future
periods will not include changes in fair value of the compound derivative
instrument, due to extinguishment of the related convertible notes, nor will
future periods include changes in fair value of convertible preferred stock
warrants, due to the conversion of such warrants to common stock warrants. See
Notes 6 and 10 included elsewhere in this annual report for further discussion
of these two items. We expect our foreign currency gains and losses to continue
to fluctuate in the future due to changes in foreign currency exchange rates.

Results of Operations



The following table sets forth our consolidated statements of income data (in
thousands):



                                                          Year Ended December 31,
                                                    2019            2018            2017
Revenues                                        $     65,207     $    37,774     $     9,393
Costs and expenses
Costs of revenues                                     43,127          25,969          11,736
Research and development                              22,418          14,304           9,919
Selling, general and administrative                   22,080          11,271           9,901
Total costs and expenses                              87,625          51,544          31,556
Loss from operations                                 (22,418 )       (13,770 )       (22,163 )
Interest income                                        1,620             293             100
Interest expense                                      (1,133 )        (1,894 )        (1,303 )
Loss on debt extinguishment                           (1,704 )        (4,658 )             -
Other (expense) income, net                           (1,440 )           150            (227 )
Loss before income taxes                             (25,075 )       (19,879 )       (23,593 )
Provision for income taxes                                (9 )            (7 )            (5 )
Net loss                                        $    (25,084 )   $   (19,886 )   $   (23,598 )
Net loss per share, basic and diluted           $      (1.39 )   $     (6.49 )   $     (7.78 )
Weighted-average shares outstanding, basic
and diluted                                       18,011,470       3,063,157       3,031,636




Revenues

The following table shows revenues by customer type (in thousands):





                             Year Ended December 31,                  Percentage change
                          2019         2018        2017        2019 vs 2018        2018 vs 2017
  VA MVP                $ 43,545     $ 18,601     $   421                134 %             4,318 %
  All other customers     21,662       19,173       8,972                 13 %               114 %
  Total revenues        $ 65,207     $ 37,774     $ 9,393                 73 %               302 %


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The following table shows our concentration of revenues by customer:





                                                Year Ended December 31,
                                            2019          2018         2017
             VA MVP                             67 %          49 %         *
             Pfizer Inc.                        13 %          10 %         *
             Merck & Co., Inc.                   *            12 %        11 %
             Customer A                          *             *          13 %
             Customer B                          *             *          10 %
             * Less than 10% of revenues




VA MVP

The increase in 2019 revenues from the VA MVP was driven by an increase in the
volume of samples we tested in the period, partially offset by lower prices per
sample.

All Other Customers

The increase in 2019 revenues from all other customers was primarily due to an
increase in the volume of samples we tested in relation to the sequencing and
data analysis services we provided to our customers.

Costs and Expenses



                                           Year Ended December 31,                   Percentage change
                                        2019         2018         2017       2019 vs 2018        2018 vs 2017
                                                (in thousands)
Costs of revenues                     $ 43,127     $ 25,969     $ 11,736                66 %               121 %
Research and development                22,418       14,304        9,919                57 %                44 %

Selling, general and administrative 22,080 11,271 9,901


            96 %                14 %
Total costs and expenses              $ 87,625     $ 51,544     $ 31,556                70 %                63 %




Costs of revenues

The increase in 2019 was primarily due to the increase in revenues discussed
above. The cost components related to the increase in costs of revenues were an
$11.7 million increase in production materials, a $2.2 million increase related
to personnel costs including salaries, bonuses, benefits, and stock-based
compensation expenses, a $1.6 million increase in depreciation and service
maintenance on capitalized equipment, a $0.5 million increase in the consumption
cost of consumables and laboratory supplies, a $0.9 million increase in IT and
facility costs, and a $0.3 million increase in other costs.

Research and development



The increase in 2019 was primarily due to increased development activities for
new product offerings, lab and automation development costs, and IT and facility
costs. Research and development expenses increased due to an increase
of $4.0 million in personnel-related expenses, including salaries, bonuses,
benefits, and stock-based compensation expenses, a $2.8 million increase in
laboratory and automation supplies consumed, a $1.2 million increase in
depreciation, service maintenance on capitalized equipment, and cost of expensed
equipment, and $0.2 million increase in other costs.

Selling, general and administrative



The increase in 2019 was due to a $7.3 million increase in personnel-related
expenses including salaries, bonuses, benefits, and stock-based compensation
expenses primarily related to increased headcount, a $3.0 million increase in
professional services primarily related to public company-related costs
(including corporate insurance, audit fees, and legal expenses), and a $0.5
million increase in other costs.

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Interest income, interest expense, and loss on debt extinguishment





                                           Year Ended December 31,                    Percentage change
                                        2019         2018         2017        2019 vs 2018          2018 vs 2017
                                                (in thousands)
Interest income                       $  1,620     $    293     $    100                453 %                 193 %
Interest expense                        (1,133 )     (1,894 )     (1,303 )              (40 )%                 45 %
Loss on debt extinguishment             (1,704 )     (4,658 )          -                (63 )%                 NM
Total interest income, interest
expense and loss on debt
extinguishment                        $ (1,217 )   $ (6,259 )   $ (1,203 )




Interest income

The increase in 2019 was due to investments of proceeds from our IPO.

Interest expense



The lower interest expense in 2019 was due to the repayment of the $20 million
growth capital loan in August 2019, which resulted in no further outstanding
debt for the remainder of the year, as well as 2018 including significant
interest expense from the Convertible Notes and Revolving Loan.

Loss on debt extinguishment



The $1.7 million loss on debt extinguishment in 2019 resulted from the
extinguishment of our $20 million Growth Capital Loan facility. The $4.7 million
loss on debt extinguishment in 2018 resulted from changes in the maturity dates
of the Convertible Notes issues in 2017.

Other (expense) income, net



                                            Year Ended December 31,                        Change $
                                         2019          2018         2017        2019 vs 2018       2018 vs 2017
                                                                    (in

thousands)


Changes in fair values of warrants
for Series B and Series C
convertible preferred stock           $   (1,403 )   $   (391 )   $    (64 )   $       (1,012 )   $         (327 )
Changes in fair value of the
compound derivative instrument                 -          574         (162 )             (574 )              736
Other                                        (37 )        (33 )         (1 )               (4 )              (32 )

Total other (expenses) income, net $ (1,440 ) $ 150 $ (227 ) $ (1,590 ) $ 377






Other expenses, net in 2019 were primarily comprised of a $1.4 million increase
in the fair values of warrants for Series B and Series C redeemable convertible
preferred stock. Other income, net in 2018 was primarily comprised of a $0.6
million decrease in fair value of the compound derivative instrument, partially
offset by a $0.4 million increase in the fair values of warrants for Series B
and Series C redeemable convertible preferred stock.

Liquidity and Capital Resources

The following table presents selected financial information and statistics as of and for the years ended December 31, 2019, 2018, and 2017 (in thousands):





                                                         Year Ended December 31,
                                                    2019           2018           2017
                                                              (in thousands)

Cash and cash equivalents, and short-term


 investments                                     $  128,289     $   19,744     $   22,617
 Property and equipment, net                         14,106         11,452          6,342
 Contract liabilities                                35,977         42,897         24,690
 Total debt                                               -          4,996         17,506
 Working capital                                     89,616        (28,291 )      (22,262 )

Cash (used in) provided by operating


 activities                                         (18,069 )        5,572  

290


 Cash used in investing activities                  (81,579 )       (7,852 

) (5,158 )

Cash provided by (used in) financing


 activities                                         134,948           (591 )       16,404


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From our inception through December 31, 2019, we have funded our operations
primarily from $144.0 million in net proceeds from our initial public offering
in June 2019 and $89.6 million from issuance of redeemable convertible preferred
stock, as well as cash from operations and debt financing. On March 22, 2019, we
received $20.0 million in gross cash proceeds from a growth capital loan. As of
December 31, 2019, we had cash and cash equivalents in the amount of
$55.0 million.

We have incurred net losses since our inception. We anticipate that our current
cash and cash equivalents and marketable securities, together with cash provided
by operating activities are sufficient to fund our near-term capital and
operating needs for at least the next 12 months.

We have based these future funding requirements on assumptions that may prove to
be wrong, and we could utilize our available capital resources sooner than we
expect. If our available cash balances, net proceeds from the offering and
anticipated cash flow from operations are insufficient to satisfy our liquidity
requirements including because of lower demand for our services or other risks
described in this annual report, we may seek to sell additional common or
preferred equity or convertible debt securities, enter into an additional credit
facility or another form of third-party funding or seek other debt financing.
The sale of equity and convertible debt securities may result in dilution to our
stockholders and, in the case of preferred equity securities or convertible
debt, those securities could provide for rights, preferences or privileges
senior to those of our common stock. The terms of debt securities issued or
borrowings pursuant to a credit agreement could impose significant restrictions
on our operations. Additional capital may not be available on reasonable terms,
or at all.

On March 22, 2019, we entered into a growth capital loan (the "Growth Capital
Loan") with TriplePoint to provide for a $20.0 million growth capital loan
facility and as of June 30, 2019, had drawn down the full $20.0 million
available under the facility. We used $5.1 million of the Growth Capital Loan to
repay, in its entirety, all amounts outstanding under the Revolving Loan.
Borrowings under the Growth Capital Loan bore interest at a floating rate of
prime, plus 5.00%, for borrowings up to $15.0 million and the prime rate plus
6.50% for borrowings greater than $15.0 million. Under the agreement, we were
required to make monthly interest-only payments through April 1, 2020 and
required to make 36 equal monthly payments of principal, plus accrued interest,
from April 1, 2020 through March 1, 2023, when all unpaid principal and interest
was to become due and payable. The agreement allowed voluntary prepayment of
all, but not part, of the outstanding principal at any time prior to the
maturity date, subject to a prepayment fee of 1.00% of the outstanding balance
if prepaid in months one through 12 of the loan term. In addition to the final
payment, we paid an amount equal to 2.75% of each principal amount drawn under
this growth capital loan facility.

In connection with the Growth Capital Loan, we issued a warrant to purchase
65,502 shares of common stock to TriplePoint at an exercise price of $9.16 per
share exercisable for seven years from March 22, 2019. We recorded the
issuance-date fair value of the warrant of $0.6 million and fees paid to
TriplePoint of $0.3 million as a debt discount, which was amortized over the
term of the Growth Capital Loan using the effective interest method. Upon
issuance, the Growth Capital Loan had an effective interest rate of 15.23% per
year. Interest expense for the year ended December 31, 2019 was $1.0 million.

On August 14, 2019, we paid off the Growth Capital Loan in its entirety and recorded a $1.7 million loss on extinguishment of debt in the consolidated statements of operations.

Our short-term investments portfolio is primarily invested in highly rated securities, with the primary objective of minimizing the potential risk of principal loss. Our investment policy generally requires securities to be investment grade and limits the amount of credit exposure to any one issuer.



During 2019, cash used by operating activities of $18.1 million was a result of
$25.1 million of net loss and the net negative change in operating assets and
liabilities of $7.3 million, partially offset by non-cash negative adjustments
to net income of $14.3 million.

Cash used by investing activities of $81.6 million during 2019 consisted of purchases of available-for-sale debt securities, net of maturities and sales, of $73.2 million, and cash used to acquire property and equipment of $8.4 million.



Cash provided by financing activities of $134.9 million during 2019 consisted
primarily of $139.8 million of proceeds from initial public offering, net of
underwriting discounts and commissions, $1.4 million of proceeds from issuance
of common stock under employee stock plans, and net proceeds from the issuance
of a Growth Capital Loan of $20.0 million, partially offset by cash used to
repay a revolving loan and issue and repay the Growth Capital Loan of $26.3
million.

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Investments in property and equipment

The Company's capital expenditures were $8.4 million during 2019, which was primarily related to the acquisition of property and equipment used for our sequencing and data analysis services.

Debt

We previously entered into various forms of convertible debt and revolving loans to finance our operations prior to our IPO. After our IPO, we paid off all remaining debt and now have zero outstanding debt balances as of 2019.



Further information regarding the Company's debt issuances can be found in Part
II, Item 8 of this Form 10-K in the Notes to Consolidated Financial Statements
in Note 6, "Borrowings."

Contractual Obligations

As a "smaller reporting company", we are not required to provide this disclosure.

Off-balance Sheet Arrangements

We did not have any off-balance sheet arrangements as of December 31, 2019.

Critical Accounting Policies and Estimates



Our consolidated financial statements are prepared in accordance with U.S. GAAP.
The preparation of these consolidated financial statements requires us to make
estimates and assumptions that affect the reported amounts of assets,
liabilities, revenues, costs and expenses, and related disclosures. Our
estimates are based on our historical experience and on various other factors
that we believe are reasonable under the circumstances, the results of which
form the basis for making judgments about the carrying value of assets and
liabilities that are not readily apparent from other sources. Actual results may
differ from these estimates under different assumptions or conditions.

An accounting policy is deemed to be critical if it requires an accounting
estimate to be made based on assumptions about matters that are highly uncertain
at the time the estimate is made, if different estimates reasonably could have
been used, or if changes in the estimate that are reasonably possible could
materially impact the financial statements. We believe that the assumptions and
estimates associated with the accounting policies discussed below have the
greatest potential impact on our consolidated financial statements. Therefore,
we consider these to be our critical accounting policies and estimates.

Revenue Recognition

Adoption of ASC Topic 606, "Revenue from Contracts with Customers"



On January 1, 2017, we early adopted the new accounting standard ASC Topic 606
using the full retrospective method. Results for reporting periods beginning
after January 1, 2017, are presented under ASC Topic 606. The impact of adopting
ASC Topic 606 was not material on our consolidated financial statements.

Revenue Recognition



We generate our revenues from selling sequencing and data analysis services. We
agree to provide services to our customers through a contract, which may be in
the form of a combination of a signed agreement, statement of work and/or a
purchase order.

Upon adoption of ASC Topic 606, we have evaluated the performance obligations
contained in contracts with customers to determine whether any of the
performance obligations are distinct, such that the customers can benefit from
the obligations on their own, and whether the obligations can be separately
identifiable from other obligations in the contract. For all of our contracts to
date, the customer orders a specified quantity of a sequencing; therefore, the
delivery of the ordered quantity per the purchase order is accounted for as one
performance obligation. Our contracts include only one performance
obligation-the delivery of the sequencing and data analysis services to the
customer.

Fees for our sequencing and data analysis services are predominantly based on a
fixed price per sample. The fixed prices identified in the arrangements only
change if a pricing amendment is agreed with a customer. In limited cases we
provide our customers a discount if samples received are above a certain volume
are purchased. In such cases, the discount applies prospectively. We have
analyzed such discounts if they represent a material right provided to a
customer. We have concluded that such discounts do not represent a material
right provided to a customer since they are not deemed to be incremental to the
pricing offered to the customer, or are not enforceable options to acquire
additional goods. As a result, these discounts do not constitute a material
right and do not meet the definition of a separate performance obligation. We do
not offer retrospective discounts or rebates. Accordingly, all of

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the transaction price, net of any discounts, is allocated to one performance
obligation. Therefore, upon delivery of the services, there are no remaining
performance obligations.

Contracts that contain multiple distinct performance obligations would require
an allocation of the transaction price to each performance obligation based on a
relative stand-alone selling price basis. Sometimes we deliver sequencing
results in two or more batches; however, since the quantity delivered per batch
of each individual test per sales order in these instances is in the same ratio
as in the original sales order, allocating the transaction price on a relative
stand-alone selling price basis would have no impact on the revenue recognized
in any period presented.

We recognize revenue when control of the promised services is transferred to our
customers. Management applies judgment in evaluating when a customer obtains
control of the promised service, which is when the sequencing and data analysis
service results are delivered to customers, at an amount that reflects the
consideration to which we expect to be entitled to in exchange for those
services. Revenue is recorded net of sales or other transaction taxes collected
from clients and remitted to taxing authorities.

A customer contract liability will arise when we have received payments from its
customers in advance, but has not yet provided genome and exome sequencing and
data analysis services to a customer and satisfied its performance obligations.
We record a customer contract liability for performance obligations outstanding
related to payments received in advance for customer deposits. We expect to
satisfy these remaining performance obligations and recognize the related
revenues upon providing sequencing and data analysis services.

All of our revenues and trade receivables are generated from contracts with customers and substantially all of our revenues are derived from U.S. domestic operations. The following section describes the accounting policies that we believe have significant judgment, or changes in judgment, as a result of adopting ASC Topic 606.

Payment Terms



Payment terms and conditions vary by contract and customer. Our standard payment
terms are typically less than 90 days from the date of invoice. In instances
where the timing of our revenue recognition differs from the timing of its
invoicing, we have determined that our contracts do not include a significant
financing component. The primary purposes of our invoicing terms are to provide
customers with simplified and predictable ways of purchasing our services and
provide payment protection for us.

Convertible Preferred Stock Warrants



We accounted for warrants to purchase shares of our redeemable convertible
preferred stock as liabilities at their estimated fair value because the
warrants may have obligated us to transfer assets to the holders at a future
date upon a deemed liquidation event. The warrants were recorded at fair value
upon issuance and were subject to remeasurement to fair value at each period
end, with any fair value adjustments recognized in the consolidated statements
of operations and comprehensive loss. We adjusted the warrant liability for
changes in fair value until the conversion of redeemable convertible preferred
stock into common stock.

Common Stock Warrants



Our common stock warrants are classified as equity as they meet all criteria for
equity classification. The common stock warrants were recorded at fair value
upon issuance, or conversion to common stock warrants in the case of our
convertible preferred stock warrants, as additional paid-in-capital in the
consolidated balance sheets. The common stock warrants are not subsequently
remeasured.

Convertible Instruments



We evaluate and account for conversion options embedded in convertible
instruments in accordance with ASC Topic 815, Derivatives and Hedging
Activities. Applicable GAAP requires companies to bifurcate conversion options
from their host instruments and account for them as freestanding derivative
financial instruments according to certain criteria. The criteria include
circumstances in which (a) the economic characteristics and risks of the
embedded derivative instrument are not clearly and closely related to the
economic characteristics and risks of the host contract, (b) the hybrid
instrument that embodies both the embedded derivative instrument and the host
contract is not remeasured at fair value under other GAAP with changes in fair
value reported in earnings as they occur, and (c) a separate instrument with the
same terms as the embedded derivative instrument would be considered a
derivative instrument.

Stock-Based Compensation



We account for stock-based compensation arrangements with employees, using a
fair value-based method, for costs related to all stock-based payments including
stock options and stock awards. Our determination of the fair value of stock
options on the date of grant utilizes the Black-Scholes option-pricing model.

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The fair value of the option granted is recognized over the period during which
an optionee is required to provide services in exchange for the option award,
known as the requisite service period which usually is the vesting period, on a
straight-line basis.

Estimating the fair value of equity-settled awards as of the grant date using
valuation models, such as the Black-Scholes option-pricing model, is affected by
assumptions regarding a number of complex variables. Changes in the assumptions
can materially affect the fair value and ultimately how much stock-based
compensation expense is recognized. These inputs are subjective and generally
require significant analysis and judgment to develop.

• Expected Term-The expected term assumption represents the


         weighted-average period that the stock-based awards are expected to be
         outstanding. We have elected to use the "simplified method" for
         estimating the expected term of the options, whereby the expected term
         equals the arithmetic average of the vesting term and the original
         contractual term of the option.

• Expected Volatility-For all stock options granted to date, the volatility


         data was estimated based on a study of publicly traded industry peer
         companies. For purposes of identifying these peer companies, we
         considered the industry, stage of development, size, and financial
         leverage of potential comparable companies.

• Expected Dividend Yield-The Black-Scholes option-pricing valuation model

calls for a single expected dividend yield as an input. We currently have


         no history or expectation of paying cash dividends on our common stock.


      •  Risk-Free Interest Rate-The risk-free interest rate is based on the yield

         available on U.S. Treasury zero-coupon issues similar in duration to the
         expected term of the equity-settled award.


We estimated the fair value of the time-based employee stock options using the
Black-Scholes option-pricing model based on the date of grant with the following
assumptions:

Common Stock Valuations

The estimated fair value of the common stock underlying our stock options was
determined at each grant date by our board of directors, with input from
management. All options to purchase shares of our common stock are intended to
be exercisable at a price per share not less than the per-share fair value of
our common stock underlying those options on the date of grant.

In the absence of a public trading market for our common stock prior to our IPO,
on each grant date, we developed an estimate of the fair value of our common
stock based on the information known to us on the date of grant, upon a review
of any recent events and their potential impact on the estimated fair value per
share of the common stock, and in part on input from an independent third-party
valuation firm. As provided in Section 409A of the U.S. Internal Revenue Code of
1986, as amended (the "Code"), we generally relied on our valuations for up to
12 months unless we experienced a material event that would have affected the
estimated fair value per common share.

Our valuations of our common stock were determined in accordance with the
guidelines outlined in the American Institute of Certified Public Accountants
Practice Aid, Valuation of Privately-Held-Company Equity Securities Issued as
Compensation (the "Practice Aid"). The methodology to determine the fair value
of our common stock included estimating the fair value of the enterprise using
the "backsolve" method, which estimates the fair value of our company by
reference to the value and preferences of our last round of financing, as well
as our capitalization.

The assumptions used to determine the estimated fair value of our common stock were based on numerous objective and subjective factors, combined with management's judgment, including external market conditions affecting the pharmaceutical and biotechnology industry and trends within the industry:

• our stage of development;

• the rights, preferences, and privileges of our redeemable convertible


         preferred stock relative to those of our common stock;


      •  the prices at which we sold shares of our redeemable convertible
         preferred stock;

• our financial condition and operating results, including our levels of


         available capital resources;


      •  the progress of our research and development efforts, our stage of
         development, and business strategy;


  • equity market conditions affecting comparable public companies; and


      •  general U.S. market conditions and the lack of marketability of our
         common stock.


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The Practice Aid identifies various available methods for allocating enterprise
value across classes and series of capital stock to determine the estimated fair
value of common stock at each valuation date. In accordance with the Practice
Aid, we considered the following methods:

• Income approach. The income approach attempts to value an asset or

security by estimating the present value of the future economic benefits


         it is expected to produce. These benefits can include earnings, cost
         savings, tax deductions, and disposition proceeds from the asset. An

indication of value may be developed in this approach by discounting


         expected cash flows to their present value at a rate of return that
         incorporates the risk-free rate for the use of funds, the expected rate

of inflation over the asset's holding period, and the risks associated

with realizing the cash flows in the amounts and at the times projected.


         The discount rate selected is typically based on rates of return
         available from alternative investments of similar type and quality as of
         the valuation date. The most commonly employed income approach to
         valuation is the discounted cash flow analysis.


      •  Market Approach. The market approach attempts to value an asset or
         security by examining observable market values for similar assets or

securities. Sales and offering prices for comparable assets are adjusted

to reflect differences between the asset being valued and the comparable

assets, such as, location, time and terms of sale, utility, and physical

characteristics. When applied to the valuation of equity, the analysis

may include consideration of the financial condition and operating

performance of the company being valued relative to those of publicly

traded companies or to those of companies acquired in a single


         transaction, which operate in the same or similar lines of business.


      •  Cost Approach. The cost approach to valuation is based upon the concept
         of replacement cost as an indicator of value and the notion that an
         investor would pay no more for an asset than what it would cost to

replace the asset with one of equal utility. The cost approach estimates


         value based upon the estimated cost of replacing or reproducing the
         asset, less adjustments for physical deterioration and functional
         obsolescence, if relevant. When applied to an enterprise, a type of cost

approach referred to as the Net Asset Method is sometimes employed. This

method measures the value of equity as the sum of the values of its

assets reduced by the sum of the values of its liabilities. The resulting


         equity is reflective of a 100% ownership interest in the business. This
         approach is frequently used in valuing holding companies.


Based on our early stage of development and other relevant factors, we
considered all three approaches and chose to apply both income and market
approaches in our analyses. We determined these approaches were the most
appropriate methods for allocating our enterprise value to determine the
estimated fair value of our common stock for valuations performed for periods up
to our IPO. In determining the estimated fair value of our common stock, our
board of directors also considered the fact that our stockholders could not
freely trade our common stock in the public markets. Accordingly, we applied
discounts to reflect the lack of marketability of our common stock based on the
weighted-average expected time to liquidity. The estimated fair value of our
common stock at each grant date reflected a non-marketability discount partially
based on the anticipated likelihood and timing of a future liquidity event.

Following our IPO, our board of directors determines the fair value of our common stock based on the closing quoted market price of our common stock on the date of grant.



Income Taxes

We account for income taxes under the asset and liability method. Deferred tax
assets and liabilities are determined based on differences between the financial
statement reporting and tax bases of assets and liabilities and net operating
loss and credit carryforwards and are measured using the enacted tax rates and
laws that will be in effect when such items are expected to reverse. Deferred
income tax assets are reduced, as necessary, by a valuation allowance when
management determines it is more likely than not that some or all of the tax
benefits will not be realized.

We assess all material positions taken in any income tax return, including all
significant uncertain positions, in all tax years that are still subject to
assessment or challenge by relevant taxing authorities. Assessing an uncertain
tax position begins with the initial determination of the position's
sustainability and is measured at the largest amount of benefit that is greater
than 50% likely of being realized upon ultimate settlement.

We have elected to account for the tax on Global Intangible Low-Taxed Income,
enacted as part of the Tax Cuts and Jobs Act as a component of tax expense in
the period in which the tax is incurred.

JOBS Act Accounting Election



We are an emerging growth company, as defined in the Jumpstart Our Business
Startups Act (the "JOBS Act"). Under the JOBS Act, emerging growth companies can
delay adopting new or revised accounting standards issued subsequent to the
enactment of the JOBS Act until such time as those standards apply to private
companies. We have irrevocably elected not to avail ourselves of this exemption
from new or revised accounting standards, and therefore, we will be subject to
the same new or revised accounting standards as other public companies that are
not emerging growth companies.

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Recent Accounting Pronouncements

See the sections titled "Summary of Significant Accounting Policies-Recent Accounting Pronouncements" and "-Recent Accounting Pronouncements Not Yet Adopted" in Note 2 to our consolidated financial statements for additional information.

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