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 in Item 8 of this Report. Unless otherwise specified, all dollar amounts are in U.S. dollars.





Overview


We are an in vitro diagnostic company that has developed a proprietary tear testing platform, the TearLab® Osmolarity System. The TearLab test measures tear film osmolarity for diagnosis of DED. Tear osmolarity is a quantitative and highly specific biomarker that has been shown to correlate with DED. The TearLab test enables the rapid measurement of tear osmolarity in a doctor's office. Commercializing our Point-of-Care tear testing platform is the focus of our business.

In October 2008, the TearLab® Osmolarity System received CE mark approval, clearing the way for sales in the European Union and all countries recognizing the CE mark. In connection with the CE mark clearance, we have entered into multi-year agreements with numerous distributors for distribution of the TearLab® Osmolarity System. Currently, we have signed distribution agreements in Central and South America, Europe, Asia, Canada, and Australia. We sell directly to the customer in the United States.

On May 19, 2009, we announced that we received 510(k) clearance from the FDA. On January 23, 2012, we announced the FDA had granted the waiver categorization under CLIA for the TearLab® Osmolarity System. The CLIA waiver reduces the regulatory paperwork and related administrative time for customers.

On October 19, 2010 we announced that a unique, new Current Procedural Terminology, or CPT, code that applied to the TearLab Osmolarity test had been published by the American Medical Association, or AMA. The code became effective January 1, 2011. The CPT code for the TearLab Osmolarity test is: 83861; Microfluidic analysis utilizing an integrated collection and analysis device, tear osmolarity (For microfluidic tear osmolarity of both eyes, report 83861 twice). This code falls under the Chemistry sub-section of the Pathology and Laboratory section of the CPT Codebook and was listed under the 2010 Clinical Laboratory Fee Schedule by the Centers for Medicare and Medicaid Services, or CMS. At 2019 reimbursement rates, payment code 83861 would be reimbursed in every state by CMS at $22.48 per eye. This decision by CMS provides level reimbursement for and equal access to the TearLab Osmolarity Test across all of the United States. The current rate in effect January 1, 2020 is $22.48.

On January 4, 2018, we announced that we had submitted a 510(k) application to the FDA for the potential clearance of the TearLab DiscoveryTM Platform. The submission covers Discovery and the MMP-9 biomarker. On February 14, 2018, we announced that the application had successfully passed the acceptance review phase with the FDA. On April 11, 2018 we announced that we received written feedback from the FDA, requesting that we provide additional information to establish correlation to the FDA-cleared predicate chosen to establish 510(k) substantial equivalence. On September 4, 2018, we submitted, and the FDA accepted, our response to the FDA's comments regarding the 510(k) application for the Discovery Platform. On October 10, 2018, we announced that the FDA determined that the TearLab Discovery™ MMP-9 test, had not met the criteria for substantial equivalence based upon data and information we submitted. We are utilizing the guidance provided by the FDA to compile the additional information necessary to resubmit for 510(k) clearance. After securing FDA clearance, we intend to pursue a CLIA waiver in an effort to prepare for commercialization in the U.S. market.





RESULTS OF OPERATIONS



Revenue, Cost of Goods Sold and Gross Profit (in thousands)





                                         For the years ended December 31,
                                                 % of                      % of
                                    2019       Revenue        2018       Revenue
             Revenue              $ 22,655        100.0 %   $ 24,999        100.0 %
             Cost of goods sold      8,356         36.9 %      9,456         37.8 %
             Gross profit         $ 14,299         63.1 %   $ 15,543         62.2 %




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Revenue


TearLab revenue consists primarily of sales of the TearLab® Osmolarity System, which is a hand-held tear film test for the measurement of tear osmolarity, a quantitative and highly specific biomarker that has shown to correlate with DED.

The TearLab® Osmolarity System consists of the following three components: (1) the TearLab disposable, which is a single-use microfluidic lab test card; (2) the TearLab pen, which is a hand-held device that interfaces with the TearLab disposable; and (3) the TearLab reader, which is a small desktop unit that allows for the docking of the TearLab disposable and the TearLab pen and provides a quantitative reading for the operator.

Having received 510(k) approval from the FDA in the United States, we sell to customers in the United States who hold CLIA certificates. The Company obtained a CLIA waiver categorization in early 2012, and continues to actively support customers in obtaining their CLIA waiver documentation which will allow the Company to sell product to the approximately 50,000 eye care practitioners in the United States that are candidates to operate under a CLIA waiver certification.

We are working with our established distributors in Canada, Europe, Central and South America, Australia and Asia to increase sales. The ability for re-imbursement to be obtained in many of those countries where we have distributors will facilitate our ability to increase sales and stimulate the commercialization process. In countries where we have distributors, we are supporting physicians in local clinical trials and providing them with the required guidance to understand the relationship between DED and osmolarity and how to manage their patients with objective diagnostic data.

TearLab revenue decreased $2.3 million or 9.4% for the year ended December 31, 2019 compared to the prior year. This decrease was driven by the decrease of both reader and test card revenue as compared to 2018.





Cost of Goods Sold


TearLab cost of sales includes costs of goods sold, depreciation of reader systems, warranty, and royalty costs. Our cost of goods sold consists primarily of costs for the manufacture of the TearLab® Osmolarity System, including the costs we incur for the purchase of component parts from our suppliers, applicable freight and shipping costs, fees related to merchant services, warehousing and logistics inventory management.

TearLab cost of sales for the year ended December 31, 2019 decreased $1.1 million or 11.6% compared to the prior year. The decrease was driven by lower revenue, reduced warranty costs, lower depreciation as our systems become fully amortized, a credit from one of our suppliers for inventory damaged in transit, as well as lower royalties due to lower revenue.





Gross Profit


TearLab gross profit for the year ended December 31, 2019 decreased by $1.2 million or 8.0% compared to the prior year. Gross profit was 63.1%, compared to 62.2% in the prior year. The change in gross profit was mainly driven by lower depreciation as our systems become fully amortized.





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Operating Expenses (in thousands)





                                                   For the years ended December 31,
                                                         % of                           % of
                                         2019           Revenue          2018          Revenue
Sales and marketing                   $     3,652            16.1 %        3,334            13.3 %
Clinical, regulatory and research
and development                             3,817            16.8 %        3,587            14.3 %
General and administrative                  6,555            28.9 %        6,160            24.6 %
Total operating expenses              $    14,024            61.9 %   $   13,081           52. 3 %




Sales and Marketing Expenses


For the year ended December 31, 2019, sales and marketing expenses increased by $0.3 million or 9.5% as compared with the prior year. This increase in sales and marketing expenses is attributable to increased advertising and promotion to drive demand of the TearLab® Osmolarity System.

Clinical, Regulatory and Research and Development

For the year ended December 31, 2019, clinical, regulatory and research and development expenses increased by $0.2 million or 6.4%, as compared with the prior year. The increase was primarily due to the increase in product development costs related to the development and testing of the TearLab Discovery™ platform.

General and Administrative Expenses

General and administrative expenses increased $0.4 million or 6.4% for the year ended December 31, 2019 compared to 2018. The increase was primarily due to tax related costs and employee retention related payouts.





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Other Income (Expense), Net (in thousands)





                                      For the years ended December 31,
                                              % of                      % of
                                 2019       Revenue        2018       Revenue
Interest expense               $ (5,703 )      -25.2 %   $ (4,709 )      -18.8 %
Other, net                           12          0.1 %         (4 )        0.0 %

Total other income (expense) $ (5,691 ) -25.1 % $ (4,713 ) -18.9 %






Interest Expense


Interest expense is generated from our long-term debt under the Term Loan Agreement, which was most recently amended on October 4, 2019. Interest expense increased $1.0 million in 2019 on larger average balances of long-term debt outstanding.





Other Income (Expense)



Other income for the year ended December 31, 2019 consists primarily of foreign exchange gains and losses, based on fluctuations of the Company's foreign denominated currencies.

Liquidity and Capital Resources (in thousands)





                                                As of December 31,
                                                 2019          2018
                 Cash and cash equivalents    $     7,108     $ 8,473
                 Percentage of total assets          49.7 %      58.4 %
                 Working capital              $   (27,899 )   $ 9,279




Financial Condition



In December 2017 TearLab raised $3 million in gross proceeds through a registered direct offering to support our operations and regulatory expenses. In addition, in April 2018, with an effective date of March 31, 2018, we renegotiated our Term Loan Agreement with CRG. This new agreement lowers the minimum liquidity requirement from an end of the day cash balance of $5 million to $3 million and it defers cash interest payments due in 2018. These changes were intended to allow our current funding to provide us with the time needed to gain our 510(k) approval for the Discovery™ Platform from the FDA as the Discovery™ Platform is critical to our success moving forward. Additionally, in November of 2018, with amendment No. 6 CRG further extended the "Interest-only period," which has the effect of pushing out the principal payments to 2020. In October 2019, the Company entered into Amendment No. 8 to the term loan agreement, which deferred our interest payment for the period ending on September 30, 2019 and added it the principal balance under the loan. In December 2019, the Company made a $1.1 million interest payment to CRG. The current Term Loan agreement is due December 31, 2020 with payments due at the end of each calendar quarter. In addition, because we did not satisfy the minimum revenue covenant for 2019 under the Term Loan Agreement, we are required to raise subordinated debt or equity, which we refer to as the CRG Equity Cure, equal to twice the difference between the annual 2019 revenue of $22.7 million and the 2019 revenue covenant of $38.0 million, or a total of $30.7 million, with the total proceeds from such financing to be used to reduce the principal of the Term Loan Agreement, within 90 days of the 2019 year end the Company would remain in default under the Term Loan Agreement. In the event of a default, the lender has the option or right to require the Company to repay the current outstanding amount of $36.6 million earlier than anticipated, and if the Company cannot, the lender has the option to invoke the foreclosure on their security interest in our assets and all obligations will become due and payable immediately. See the Risk Factor section of this Form 10-K for further discussion regarding the Term Loan Agreement and risks associated with the Term Loan Agreement and our failure to satisfy the 2019 revenue covenant thereunder. Based on our current rate of cash consumption, the potential for accelerated debt repayment requirements, in addition to our projections, we estimate we will need additional capital during the first quarter of 2020. Our prospects for obtaining that capital are uncertain. Due to the Company's historical losses and financial condition, there is substantial doubt about the Company's ability to continue as a going concern.





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Our forecast of the period of time through which our financial resources will be adequate to support our operations is a forward-looking statement and involves risks and uncertainties. Actual results could vary as a result of a number of factors. We have based this estimate on assumptions that may prove to be wrong. We could utilize our available capital resources sooner than we currently expect. Our future funding requirements will depend on many factors, including but not limited to:





  ? whether CRG offers a covenant waiver or an Equity Cure can be obtained within
    90 days;
  ?
    Our ability to execute our commercial strategy with our current resources;

  ? whether government and third-party payers agree to continue reimbursement of
    the TearLab® Osmolarity System at current levels;

  ? the cost and results of continuing development of our next generation TearLab
    DiscoveryTM Platform including the cost of suppliers and service providers
    that require advance payment;

  ? the costs of filing, prosecuting, defending and enforcing any patent claims
    and other intellectual property rights; and

  ? the effect of competing technological and market developments.



At the present time, our only product is the TearLab® Osmolarity System, and although we have received 510(k) clearance from the FDA and a CLIA waiver approval from the FDA, at this time, we do not know when we will generate revenue from the TearLab® Osmolarity System in the United States to fully fund our operations. If events or circumstances occur such that we do not meet our plans to fund the business, we may be required to further reduce operating expenses and reduce the planned levels of inventory and fixed assets which could have an adverse impact on our ability to achieve our intended business objectives and/or continue the development of the TearLab Discovery™ Platform.





Indebtedness


On March 4, 2015, the Company executed a term loan agreement (the "Term Loan Agreement") with CRG LP and certain of its affiliate funds ("CRG") as lenders providing the Company with access of up to $35.0 million under the Term Loan Agreement. The Company received $15.0 million in gross proceeds under the Term Loan Agreement on March 4, 2015, and an additional $10.0 million on October 6, 2015. We were unable to access a third tranche of $10.0 million because we did not attain at least $38.0 million in twelve-month revenue prior to June 30, 2016, as required to access the third tranche. The Term Loan Agreement matures on December 31, 2020 and bears interest at 13% per annum, with quarterly payments of interest only for the first four years. While interest on the loan is accrued at 13% per annum, the Company may elect to make interest-only payments at 8.5% per annum. The unpaid interest of 4.5% is added to the principal of the loan and is subject to additional accrued interest ("PIK interest"). The accrued interest can be deferred and paid together with the principal in the fifth and sixth years.

As part of Amendment No. 2 to the Term Loan Agreement, and funding of the second tranche, CRG received warrants to purchase 35,000 common shares in the Company at a price of $50.00 per share (the "2015 CRG Warrants"). The 2015 CRG Warrants have a life of five years. On April 7, 2016, the Company entered into Amendment No. 4 to the Term Loan Agreement which reduced the exercise price of the 2015 CRG Warrants received under the second amendment to $15.00 per share and granted CRG warrants to purchase an additional 35,000 common shares in the Company at a price of $15.00 per share (the "2016 CRG Warrants" and together with the 2015 CRG Warrants the "CRG Warrants"), which expires 5 years after issuance.

On October 12, 2017, the Company entered into Amendment No. 5 to the Term Loan Agreement. pursuant to the Amendment, the Company agreed to amend the warrants previously issued by the Company to CRG to (i) reduce the strike price to $1.50 per share and (ii) to include broad based anti-dilution protection such that the warrants shall maintain the same 1.22% ownership percentage following any capital raises the Company may complete through March 31, 2018.

In connection with the December 2017 offering the Company issued CRG additional warrants to purchase 83,240 shares of commons stock at an exercise price of $1.50 ("2017 CRG Warrants").

On April 4, 2018 with an effective date of March 31, 2018, the Company entered into Amendment No. 6 to the Term Loan Agreement. Pursuant to the terms of this amendment, the cash interest payments due in 2018 were deferred and added to the principal balance under the Term Loan Agreement at the end of each quarter. This amendment also provided an additional facility fee equal to 3% of the sum of the aggregate amount of the principal drawn under the Term Loan Agreement and any PIK loans issued, so that the total facility fee shall be 9.5%, applicable to the entire balance. In addition, this amendment reduced the minimum liquidity covenant to $3 million. Concurrent with the reduction of the liquidity covenant the Company agreed to repay CRG $1.0 million of principal on the Term Loan Agreement in April 2018. Lastly, this amendment reduced the strike price of the existing CRG Warrants and the 2017 CRG Warrants to $0.44 per share. This amendment was accounted for as a modification in accordance with U.S. GAAP.

On November 12, 2018 the Company entered into Amendment No. 7 to the Term Loan Agreement. Pursuant to the terms of the agreement, the Amendment extended the "Interest-Only Period" under the Term Loan Agreement from the sixteenth (16th) payment date to the twentieth (20th) payment date following the first borrowing date, which has the effect of pushing out the principal payments to 2020. In addition, the cash interest payments under the Term Loan Agreement for periods ending on March 31, 2019 and June 30, 2019 were deferred and added to the principal balance under the Term Loan Agreement at the end of each such quarter. Additionally, if the Federal Drug Administration ("FDA") had received and accepted our application for review of our DiscoveryTM Platform on or before June 30, 2019 the Company would have been entitled to pay the interest on the outstanding principal amount of the loans under the Term Loan Agreement payable during the quarter ended September 30, 2019 entirely, in the form of a PIK Loan. Finally, the Amendment reduced the minimum required revenue for 2018 under the Term Loan Agreement from $25 million to $24 million.





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On October 4, 2019 with an effective date of September 30, 2019 the Company entered into Amendment No. 8 to the Term Loan Agreement. Pursuant to the terms of the agreement, the Amendment deferred the cash interest payment for the period ending September 30, 2019 and added it to the principal balance under the Term Loan Agreement.

The Term Loan Agreement is collateralized by all assets of the Company. Additionally, the terms of the Term Loan Agreement contain various affirmative and negative covenants agreed to by the Company. Among them, the Company must attain minimum certain annual revenue and minimum cash threshold levels through calendar year 2020. The minimum annual revenue threshold level required by the Term Loan Agreement, 2019 is $38.0 million and $45.0 million for 2020. The minimum cash balance required is $3.0 million, subject to certain conditions.

The Company is currently in default of the 2019 minimum revenue threshold of $38.0 million and, the Company will have to raise subordinated debt or equity (the "CRG Equity Cure") of $30.7 million which is equal to twice the difference between the annual revenue and the revenue covenant with the total proceeds from this financing to be used to reduce the principal of the Term Loan Agreement which would cure the default in accordance with the terms of the loan. The Company has 90 days to achieve this "Cure" unless a covenant waiver is given or the Term Loan Agreement is amended. In the event the Company cannot complete the CRG Equity Cure and a covenant waiver is not received, the Company would remain in default of the Term Loan Agreement. In the event of a default, the lender has the option or right to require the Company to repay the current outstanding amount of $36.6 million earlier than anticipated, and if the Company cannot, the lender has the option to invoke the foreclosure on their security interest in our assets and all obligations will become due and payable immediately. See the Risk Factor section of this Form 10-K for further discussion regarding the Term Loan Agreement and risks associated with the Term Loan Agreement and our failure to satisfy the 2019 revenue covenant thereunder.

Ongoing Sources and Uses of Cash

We anticipate that our cash and cash equivalents and cash generated from business operations will be sufficient to sustain our operations into the first quarter of 2020. We continually evaluate various financing possibilities but we typically expect our primary source of cash will be related to the collection of accounts receivable. Our accounts receivable collections will be impacted by our ability to maintain current customers and annuity revenue base, while reducing costs as per our business model.

We expect to use our cash primarily to fund our operating expenses and to pursue the development and generation of clinical data for our new generation platform.

Changes in Cash Flows (in thousands)





                                                           Years ended December 31,
                                                           2019                 2018

Cash (used in) provided by operating activities $ (954 ) $ 2,662 Cash used in investing activities

                               (411 )               (461 )
Cash used in financing activities                                  -               (1,000 )
Net (decrease) increase in cash and cash
equivalents during the year                           $       (1,365 )     $        1,201

Cash Used in Operating Activities

Net cash used in our operating activities for 2019 was $1.0 million compared to net cash gained of $2.7 million during the prior year. Net cash used in operating activities was less than our net loss for the year of $5.4 million primarily due to the depreciation of fixed assets, stock-based compensation expense, deferred interest, and the amortization of the discount on our long-term debt. In aggregate, these non-cash expenses totaled $5.4 million during the year reduced by a $1.0 million net increase in non-cash working capital.





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The net change in non-cash working capital and non-current asset balances related to operations for the years ended December 31, 2019 and 2018 consists of the following (in thousands):





                                       Years ended December 31,
                                       2019               2018

Accounts receivable, net            $      269       $          350
Inventory                                 (282 )                 11
Prepaid expenses and other assets         (872 )                  -
Other non-current assets                    31                  (50 )
Accounts payable                           (82 )             (1,039 )
Accrued liabilities                        (25 )               (497 )
Deferred rent/revenue                       12                  (28 )
                                    $     (949 )     $       (1,253 )

Explanations of the more significant net changes in working capital and non-current asset balances are as follows:





  ? Accounts receivable decreased in 2019 due to improved collection on
    outstanding balances and a reduction in sales;

  ? Inventory levels of test cards on hand increased in 2019 due to lower than
    expected sales volumes;

  ? Prepaid expenses and other assets had an increase in 2019 due to the purchase
    of parts for the TearLab DiscoveryTM systems to be built upon FDA approval.



Cash Used in Investing Activities

Net cash used in investing activities for the years ended December 31, 2019 and 2018 was $0.4 million and $0.5 million, respectively, which we used to acquire fixed assets.

Cash Used in Financing Activities

There was zero net cash provided by or used in financing activities for the year ended December 31, 2019. For the year ended December 31, 2018, cash used by financing activities was $1.0 million, which was used to reduce the principal of the CRG loan.





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The following table summarizes our contractual commitments as of December 31, 2019 and the effect those commitments are expected to have on liquidity and cash flow in future periods (in thousands):





                                              Less Than       1 To 3       More Than
Contractual obligation           Total         1 Year         Years         3 Years
Operating leases                $    829     $       311     $    518     $         -
Royalty payments                     385              35          105             245
Purchase obligations                 676             676            -               -
Long-term debt                    24,000          24,000            -               -
Interest payments                 16,160          16,160            -               -

Total contractual obligations $ 42,050 $ 41,182 $ 623 $ 245

Off-Balance-Sheet Arrangements

As of December 31, 2019, we did not have any material off-balance-sheet arrangements.

Critical Accounting Policies and Estimates

Management's discussion and analysis of our financial condition and results of operations is based upon our audited consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States ("US GAAP"). The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, sales and expenses, and related disclosure of contingent assets and liabilities. We continually evaluate our estimates and judgements, the most critical of which are those related to revenue recognition, inventory valuation and allowance for doubtful accounts. We base our estimates on historical experience and other factors that we believe to be reasonable under the circumstances. Materially different results can occur as circumstances change and additional information becomes known.

We believe the following critical accounting policies affect our more significant judgments and estimates used in the preparation of our audited consolidated financial statements.





Revenue Recognition


Revenue is recognized when obligations under the terms of a contract with our customer are satisfied; generally this occurs with the transfer of control of our products or services. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services which includes estimates of variable consideration that results from returns, rebates or test card replacements. The Company records allowances for returns and rebates and reports revenue net of such amounts which was $103 and $60 for the twelve months ended December 31, 2019 and 2018, respectively. Sales and other taxes we collect concurrent with revenue-producing activities are excluded from revenue. The Company's payment terms are typically upon shipment or net 30.

The Company sells its proprietary TearLab® Osmolarity System and related test cards to external customers, who are primarily eye care professionals, for use in osmolarity testing procedures. Revenue is primarily derived from the sale of disposable test cards. Products are generally shipped from a distribution and warehousing facility located in Escondido, California. The Company's sales are currently direct to customers in the United States and to distributors in the rest of the world.

The Company enters into contracts where revenue is derived either from agreements whereby the customer is provided the right to use the TearLab® Osmolarity System (reader equipment) at no separate cost to the customer in consideration for a minimum or implied purchase commitment of disposable test cards over the related contract term (referred to as either "Use Agreements," "Masters Agreements" or "Flex Agreements"), or from agreements to sell the reader equipment and disposable test cards at their stand-alone selling price with no contractual future purchase commitment (referred to as "Purchase Agreements").





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Use, Masters, and Flex Agreements

Purchase commitments for Use Agreements and Flex Agreements are expressed in the agreement for a specified period of time (generally one to three years). The purchase commitment for Masters Agreements is implied for large physician practices with an expectation of purchasing certain levels of test cards. The Company recovers the cost of providing the reader equipment in the amount charged for disposable test cards. Two performance obligations exist under these contracts, related to the customers' right to use the reader equipment and orders of test cards. As the customer has the ability and right to operate the reader equipment in a manner it determines as well as obtain the output from using the reader equipment, the revenue related to the reader equipment use performance obligation is recognized in accordance with ASC 842 - Leases, wherein revenue related to the reader equipment is recognized over the defined contract term. Revenue related to disposable test cards is recognized as the disposable test cards are shipped. Based on the nature of these contracts, which provide terms for the future purchase of test cards but do not contractually obligate the customer to do so, each purchase of test cards is treated as its own distinct contract with a performance obligation to provide the test cards ordered, memorialized by the customers' purchase order/request. Revenue under such agreements is allocated between the lease of the reader equipment and the sale of the disposables based upon each component's relative standalone selling price, which is estimated using the selling prices of the reader device and test cards under Purchase Agreements, discussed further below.

When reader equipment is placed with a customer at no separate cost, the Company retains title to the equipment and it remains capitalized on the Company's Consolidated Balance Sheet as equipment classified within fixed assets, net. The equipment is depreciated on a straight-line basis once shipped to a customer location over its estimated useful life and depreciation expense is included in cost of goods sold within the Consolidated Statements of Operations.





Purchase Agreements


Revenue recognition for Purchase Agreements is based on the individual performance obligations determined to exist in the contract. Since the reader equipment and the test cards are separate and distinct delivered items, the delivery of each are considered separate performance obligations. The reader equipment and test cards are separately identified under the Purchase Agreements and are sold at their standalone selling price. The Company recognizes revenue for each of the performance obligations only when it determines that all applicable recognition criteria have been met, which is usually upon shipment to the customer. Under Purchase Agreements, the customer is not contractually obligated to purchase additional test cards, and each subsequent order of test cards represents a separate and distinct contract with the performance obligation to provide the test cards ordered.

Amounts billed to customers for shipping and handling of a sales transaction are included as revenue.

Valuation of Intangible and Other long-lived Assets

We periodically assess the carrying value of intangible and other long-lived assets, which requires us to make assumptions and judgments regarding the future cash flows of these assets. The assets are considered to be impaired if we determine that the carrying value may not be recoverable based upon our assessment of the following events or changes in circumstances:





  ? the asset's ability to continue to generate income from operations and
    positive cash flow in future periods;

  ? loss of legal ownership or title to the asset;

  ? significant changes in our strategic business objectives and utilization of
    the asset(s); and

  ? the impact of significant negative industry or economic trends.




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If the assets are considered to be impaired, the impairment is the amount by which the carrying value of the assets exceeds the fair value of the assets. Fair value is determined by a combination of available third-party sources and discounted cash flows. In addition, we base the useful lives and related amortization or depreciation expense on our estimate of the period that the assets will generate revenue or otherwise be used by us. We also periodically review the lives assigned to our intangible assets to ensure that our initial estimates do not exceed any revised estimated periods from which we expect to realize cash flows from the technologies. If a change were to occur in any of the above-mentioned factors or estimates, the likelihood of a material change in our reported results would increase.

As of December 31, 2019, the net book value of fixed assets equaled $1.7 million.

Allowance for Doubtful Accounts

We maintain an allowance for doubtful accounts to reflect estimated losses resulting from our customers' inability to make required payments. On an on-going basis, we evaluate the collectability of accounts receivable based on a combination of factors, including historical collection trends, current economic factors, and the assessment of collectability of specific accounts.

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