Sight Sciences, Inc. (SGHT) FY 2022 MD&A

Overview

Sight Sciences’ mission is to transform ophthalmology and optometry through the development and commercialization of proprietary devices that target the underlying causes of the world’s most prevalent eye diseases. We are passionate about improving patients’ lives. Our objective is to develop and market products for use in new treatment paradigms and to create an interventional mindset in eyecare whereby our products may be used in procedures which supplant conventional outdated approaches. Our business philosophy is grounded in the following principles:

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comprehensively understand disease physiology;

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develop products that are intended to restore natural physiological functionality to diseased eyes;

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develop and market products that achieve superior effectiveness versus current treatment paradigms while minimizing complications or side effects;

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provide intuitive, patient friendly solutions to ophthalmologists and optometrists; and

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deliver compelling economic value to all stakeholders, including patients, providers and third-party payors such as Medicare and commercial insurers.

Our initial product development has focused on the treatment of two of the world’s most prevalent and underserved eye diseases, glaucoma and dry eye disease. We have commercialized products in each of our two reportable segments; Surgical Glaucoma and Dry Eye. Our Surgical Glaucoma segment consists of sales of the OMNI and SION, while our Dry Eye segment includes sales of the TearCare, and related components and accessories. Each product is primarily sold through a highly-involved direct sales model that offers intensive education, training and customer service. We believe this philosophy and model not only enables us to differentiate our products and our overall company from competitors, but also to expand our addressable market by educating ECPs, patients and other stakeholders on our products and evolving treatment paradigms. Outside of the U.S., we have historically sold OMNI primarily through a network of distributors, although we began employing a small direct sales force outside of the United States in 2021.

We sell OMNI and SION to facilities where ophthalmic surgeons perform outpatient procedures, mainly ASCs and HOPDs, which are typically reimbursed by Medicare or private payors for procedures using our products. We sell TearCare to optometrist and ophthalmologist practices. Currently, there is no meaningful reimbursement coverage by Medicare or private payors for MGD procedures, including TearCare, and patients typically pay out-of-pocket for TearCare. We are continuing our controlled commercial launch and are focused on our comprehensive, clinical data-driven long-term market development plan that aims to improve awareness and patient access to TearCare. We have dedicated meaningful resources to execute our commercial strategy and we continue to expand our sales organization through additional sales representatives and territories. The overall success of our approach to eyecare to date is evidenced by the over 130,000 estimated uses of OMNI and its direct predicates in over 1,500 hospitals and ASCs in the U.S. and Europe, and over 20,000 estimated uses of TearCare in over 1,000 eyecare facilities in the U.S. through December 31, 2022.

We currently operate no manufacturing facilities and instead contract with third parties for our production requirements. We believe our suppliers will be able to meet our current and anticipated manufacturing needs across all our products. We plan to continue to utilize third party contract manufacturers for our products and any related components.

Our gross margin in our Surgical Glaucoma segment for the years ended December 31, 2022 and 2021 was 87.4% and 86.1%, respectively. In 2021, we shifted our primary production of OMNI from a U.S.-based third-party contract manufacturer, to a lower cost, higher volume contract manufacturer in Asia. We are in the process of supplementing this OMNI production capacity with a U.S.-based contract manufacturer. These cost optimization initiatives contributed to the increase in gross margins in our Surgical Glaucoma segment. Our gross margin in our Dry Eye segment for the years ended

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December 31, 2022 and 2021 was 29.1% and 13.1%, respectively. The TearCare System includes the SmartHub component, which is typically only sold in initial purchase orders, and single-use SmartLids which are sold as part of initial purchase orders and through repeat orders as the ECP performs procedures over time. Given the earlier stage of TearCare’s commercial development, we expect our Dry Eye segment’s gross margins to be lower than our Surgical Glaucoma segment’s gross margins for the near and medium-term due to the allocation of fixed labor and overhead costs to the segment's cost of goods sold.

We believe in the importance of continued strategic investment in initiatives that: further demonstrate our products’ clinical effectiveness and safety to potential customers, patients, payors and regulators; enhance our commercial capabilities, including resources dedicated to sales, marketing and education; ensure the broadest possible patient access to the treatment alternatives that our products are cleared to offer; enhance and improve upon our existing product technologies; and allow us to innovate new products, devices or drugs, in glaucoma and ocular surface disease or in new eye disease areas. As a result, we intend to continue to invest in clinical studies, sales and marketing, education initiatives, market access, and product development. Because of these and other factors, we expect to continue to incur net losses for at least the next several fiscal years. Moreover, we expect to incur expenses as a result of operating as a public company, including expenses related to compliance with the rules and regulations of the SEC and those of the Nasdaq Stock Market, additional insurance expenses, investor relations activities and other administrative and professional services. As a result of these and other factors, we may require and seek additional debt and equity financing to fund our operations and planned growth.

To date, our primary sources of capital has been private placements of redeemable convertible preferred stock, debt financing agreements, the sale of common stock in our IPO, and revenue from the sale of our products. In July 2021, we completed our IPO, receiving net proceeds of $252.2 million. As of December 31, 2022, we had an outstanding term loan balance of $35.0 million (excluding debt discount and amortized debt issuance costs), cash and cash equivalents of $185.0 million and an accumulated deficit of $239.2 million.

During the year ended December 31, 2022, we generated revenue of $71.3 million, with a gross margin of 82.7%. Our net loss for the year ended December 31, 2022 was $86.2 million. For the year ended December 31, 2021, we generated revenue of $49.0 million, with a gross margin of 82.4%. Our net loss for the year ended December 31, 2021 was $63.0 million. For all periods presented, substantially all of our revenue was generated from customers in the U.S.

Impact of COVID-19

The global COVID-19 pandemic has impacted and may in the future impact demand for our products, which are used in procedures and therapies that are considered elective. Future surges of COVID-19 may result in governmental restrictions being re-implemented to reduce the spread of COVID-19 or patients and healthcare providers otherwise postponing elective eyecare procedures.

Any future impact of the COVID-19 pandemic will depend on future developments that are highly uncertain and cannot be predicted with confidence, and will depend on certain developments, including the duration and severity of the COVID-19 pandemic and its potential variants. Among other things, the COVID-19 pandemic could disrupt the operations of our third-party manufacturers and other suppliers. We are working closely with our manufacturing partners and suppliers to help ensure that we are able to source key components and maintain appropriate inventory levels to meet customer demand. Nevertheless, as occurred in earlier stages of the COVID-19 pandemic, we may, among other things, experience reduced customer demand or constrained supply that could materially adversely impact our business, results of operations, liquidity and cash flows in future periods.

Factors Affecting Our Business and Results of Operations

We believe there are several important factors that have impacted and that will continue to impact our business and results of operations. These factors include, but are limited to:

Product Development

We believe our product development approach is a key differentiator of our team and our company. We are focused on continuous innovation and design and utilize input from our network of expert employees (including several ophthalmologists on staff), advisors and customers to rapidly iterate our pre-and post-commercial product designs with the aim of better satisfying the needs of our customers and their patients, and increasing adoption and utilization of our

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solutions. Once our products are launched, our customer feedback loop helps us further develop our products. This is particularly evident in the evolution of our OMNI Surgical System, which originated from the combined functionality of two internally developed, commercial predicate devices, each of which had their own multiple commercial iterations. Our future growth is dependent on our ability to continue innovating and applying our expertise of disease physiology to improve existing products and develop new products.

Market Education and Training on the Benefit of our Products vis-à-vis Existing Treatment Alternatives

One of the key drivers of our success is educating ophthalmologists, optometrists, patients, and third-party payors about the clinical and safety benefits of our products and of the benefits of more proactive, interventional approach to treating glaucoma and DED. We believe the required market education and development is best accomplished through a differentiated, highly involved commercial approach. As such, we devote significant resources to onboarding our sales professionals and to continuously augmenting their knowledge and capabilities. Our sales professionals provide ECPs with the necessary education, training and support to adopt and continue to use our products. We believe that increasing acceptance and usage of our products will require continued investment in our sales force and education efforts to ensure ECPs, patients and third-party payors learn more about our products and appreciate our benefits to their target patient populations.

Maximizing Product Usage by Customers

Demand for our products will be highly dependent on our ability to develop their potential addressable markets and maximize the breadth of patients our products can serve. OMNI is indicated for canaloplasty followed by trabeculotomy to reduce IOP in adult patients with POAG in the U.S. and with OAG, in the EU. We believe that OMNI is the only device that is authorized by the FDA as an ab interno procedure to: reduce IOP in adult patients with POAG across the spectrum of disease severity; be used in mild-to-moderate Combination Cataract or Standalone procedures; access 360 degrees of the diseased conventional outflow pathway through a single clear corneal incision; and facilitate two consecutive procedures, canaloplasty and trabeculotomy, to comprehensively treat all three primary points of resistance in the conventional outflow pathway in a single operating room visit. Our ability to establish OMNI as the standard of care for all POAG patients by continuing to grow its adoption and utilization in Combination Cataract procedures and by pioneering the development of the market for interventional standalone procedures will have a substantial impact on our future growth.

We introduced our SION Surgical Instrument in the third quarter of 2022. SION satisfies the American Academy of Ophthalmology definition of goniotomy and is registered with the FDA as a Class I 510(k) exempt device. SION’s bladeless design, micro-engineered and precision manufactured using specialized lasers, excises tissue without cutting. SION grasps and removes diseased tissue as the surgeon sweeps the instrument around Schlemm’s canal with a single smooth motion. The bladeless technology of SION was developed with leading ophthalmic surgeons to improve safety and ease of use by eliminating the need to navigate sharp instrumentation within the eye’s anterior chamber and iridocorneal angle anatomy. SION allows us to serve specific subsets of customers who may prioritize a faster or simpler procedure. Our target customers for SION include three types of combination cataract MIGS surgeons that are distinct from target OMNI customers: 1) high volume cataract surgeons seeking to perform the quickest MIGS procedures, 2) surgeons who are initially less experienced with MIGS such as surgical fellows at academic institutions and 3) surgeons looking for the most cost effective MIGS procedures in facilities that may emphasize procedural profitability. We believe that these use cases have very little overlap with the use cases for our OMNI device. Our ability to establish SION as a product with differentiated ease of use, safety and efficacy will be an important driver of SION’s commercial growth and success.

TearCare is a unique open-eye heating and expression device designed to melt and remove meibomian gland obstructions. We believe TearCare has a compelling physiological profile to address obstruction from meibomian gland disease, or MGD, which is the primary cause of evaporative DED, a disease characterized by low quality tears that evaporate prematurely. The current DED treatment market primarily consists of an abundance of OTC and prescription eyedrops that seek to lubricate the ocular surface, alleviate inflammation and/or increase tear production. However, OTC and prescription eyedrops are incapable of clearing obstructions in the meibomian glands and do not address MGD’s eyelid-borne physiology and poor tear quality. MGD is associated with 86% of DED cases and is a leading root cause of evaporative DED, which is characterized by low quality tears that evaporate prematurely. Clinical studies have demonstrated that treating MGD by liquefying and removing clogged meibum is the most effective method to eliminate obstructions and restore the lipid layer of tear film, thereby preventing premature evaporation of tears. TearCare was designed to be administered during the course of a routine office visit to an ECP, which makes it convenient for patients,

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and allows providers to maintain procedural throughput in their practices. Our ability to improve patient access and market education on TearCare and the benefits of proactive MGD treatment will be key drivers of TearCare’s future growth.

Operational Excellence and Cost Efficiency

We aim to achieve operating and financial milestones with optimal capital efficiency, and focus on our market value relative to invested capital as a key measurement of our performance. To date, we have raised $402.4 million in net proceeds from equity and debt financings, including $252.2 million from our IPO. With a portion of these net proceeds (our December 31, 2022 cash and equivalents was $185.0 million), we believe we have developed and commercially launched two clinically differentiated products, funded multiple completed and ongoing clinical trials, and built our management team and company infrastructure to support the continued growth of our business. We believe that this level of operational and commercial progress relative to our total capital investment to date compares favorably to medical technology peers. We seek to design products that can achieve attractive long-term gross margins.

Components of Our Results of Operations

Revenue

We currently derive the majority of our U.S. revenue from the sale of OMNI and SION to ASCs and HOPDs and TearCare to ophthalmology and optometry practices. During the years ended December 31, 2022 and 2021, the revenues from our Surgical Glaucoma segment accounted for over 90% of our total revenues. Substantially all of our revenues for both periods were generated from sales within the U.S. Our Surgical Glaucoma customers place orders based on their expected procedure volume and reorder as needed, typically on a biweekly, monthly or bimonthly basis. Our TearCare customers typically purchase a TearCare System which consists of one or more SmartHubs, multiple single-use SmartLids and other accessories. After utilizing their initial inventory, customers can reorder SmartLids as needed. No single customer accounted for 10% or more of our revenue for the years ended December 31, 2022 and 2021.

The growth in our revenue is driven by the demand for elective surgery and treatment utilizing our products. Such demand is often lower during summer months because of ECP vacations and in winter months in certain parts of the world because of fewer business or surgery days due to holidays and adverse weather conditions.

Cost of Goods Sold and Gross Margin

Our products are produced by third-party manufacturers. Our cost of goods sold consists primarily of amounts paid for our products to third-party manufacturers, and our manufacturing overhead costs, which consist primarily of personnel expenses, including salaries, benefits and stock-based compensation, and reserves for excess, obsolete and non-sellable inventory. Cost of goods sold also includes depreciation expenses for production equipment which we provide to our third-party manufacturers and certain direct costs, such as shipping and handling costs.

We calculate gross margin as gross profit divided by revenue. Our gross margin has been and will continue to be affected by a variety of factors, including differences in segment gross margins, changes in average selling prices, product sales mix, production and ordering volumes, manufacturing costs, product yields, and headcount. In general, we expect our gross margins to increase over the long-term to the extent our production and ordering volumes increase and to the extent we spread the fixed portion of our overhead costs over a larger number of units produced. We intend to use our design, engineering and manufacturing know-how and capabilities to further advance and improve the efficiency of our suppliers’ manufacturing processes, which we believe will reduce costs and increase our gross margins. Our gross margins could fluctuate from quarter to quarter as we transition to new suppliers, introduce new products and adopt new manufacturing processes and technologies.

Research and Development Expenses

Research and development ("R&D") expenses consist primarily of engineering, product development, clinical studies to develop and support our products, including clinical trial design, clinical trial site initiation and study costs, internal and external costs associated with our regulatory compliance and quality assurance functions, medical affairs, cost of products used for clinical trials and other costs associated with products and technologies – either new or enhancements of existing platforms – that are in development. These expenses also include personnel expenses, including salaries, benefits and stock-based compensation, supplies, consulting, prototyping, testing, materials, travel expenses, depreciation expenses for equipment and an allocation of IT and facility overhead expenses. Our R&D expenses as a percentage of revenue may vary over time depending on the level and timing of new product development efforts, as well as clinical development, clinical

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trial and other related activities. We expect our R&D expenses to increase for the next several years as we continue to invest in our active clinical trial program, develop new products and improve our existing products.

Selling, General and Administrative Expenses

Selling, general and administrative ("SG&A") expenses consist primarily of personnel expenses, including salaries, benefits and stock-based compensation related to selling, marketing and corporate functions, allocation of IT and facility overhead expenses, bad debt expense, finance, legal and human resource costs. Other SG&A expenses include training, travel expenses, promotional activities, marketing initiatives, market research and analysis, conferences and trade shows, professional services fees (including external legal, audit, consulting and tax fees), insurance costs, and general corporate expenses.

Interest Expense

Interest expense consists primarily of interest incurred on our outstanding indebtedness and non-cash interest related to the amortization of debt discount and issuance costs associated with our outstanding loan.

Other Income (Expense), Net

Other income (expense), net consists of interest and amortization on held-to-maturity investments in treasury securities, as well as, gains and losses resulting from the remeasurement of the fair value of our redeemable convertible preferred stock warrant liability. The redeemable convertible preferred stock warrants were exercised in 2021 and the final fair value of the warrant liability was reclassified to stockholders’ equity. We will no longer record any related periodic fair value adjustments.

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Results of Operations

Comparison of the Years Ended December 31, 2022 and 2021

Revenue. Revenue in the year ended December 31, 2022 was $71.3 million, an increase of $22.4 million, or 45.7%, from our revenue in 2021. Surgical Glaucoma and Dry Eye sales contributed $65.6 million and $5.7 million, respectively. The overall increase in Surgical Glaucoma revenue was primarily attributable to a significant increase in the number of OMNI units sold in the year ended December 31, 2022 as a result of growth in the number of facilities ordering OMNI and an increase in unit utilization per ordering facility, as well as the introduction of SION in the third quarter of 2022. Our Dry Eye revenues increased in the year ended December 31, 2022 versus the prior year due to the continued growth in our installed base of facilities that have purchased TearCare. Surgical Glaucoma sales represented 92.0% and 95.0% of our revenue generated in the years ended December 31, 2022 and 2021, respectively.

Cost of Goods Sold and Gross Profit. Cost of goods sold during the year ended December 31, 2022, increased $3.8 million compared to the prior year. The increase was driven by an increase both our Surgical Glaucoma and Dry Eye segments. Dry Eye cost of goods sold increased $1.9 million in the year ended December 31, 2022 over the prior year, which was driven by increased sales activity, as well as by $0.9 million of charges in 2022 associated with a voluntary recall of our SmartHub 1.0 devices. Our Surgical Glaucoma cost of goods sold increased $1.8 million as compared to 2021, which was primarily driven by an increase in sales activity.

Our total gross profit was $59.0 million for the year ended December 31, 2022, an increase of $18.6 million compared to the prior year. Our total gross margin increased from 82.4% to 82.7% from the year ended December 31, 2021 to the year ended December 31, 2022. The increase in gross margin was primarily due to increased sales volume in OMNI units and manufacturing efficiencies. Gross margin in our Surgical Glaucoma segment was 87.4% for the year ended December

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31, 2022, an increase from 86.1% for the prior year period. In our Dry Eye segment, gross margin increased from 13.1% in 2021, to 29.1% for the year ended December 31, 2022.

Research and Development Expenses. R&D expense for the year ended December 31, 2022 was $22.9 million, an increase of $7.2 million compared to the prior year. The increase was primarily attributable to a $3.9 million increase in personnel expenses as a result of increased headcount, including a $0.9 million increase in stock-based compensation expense. In addition, there was a $2.1 million increase in clinical studies expense and $0.8 million increase in legal expenses incurred.

Selling, General, and Administrative Expenses. SG&A expenses were $120.1 million for the year ended December 31, 2022, an increase of $43.9 million from the prior year comparable period. The increase was attributable to a $27.9 million increase in personnel expenses as a result of increased headcount, which included a $7.0 million increase in stock-based compensation expense. In addition to personnel expense increases, our SG&A expense from 2021 to the 2022 period included a $6.1 million increase in professional services expense, including consulting and legal expenses, a $3.8 million increase in marketing expenses, a $1.9 million increase in training, events, and demos, and a $1.7 million increase in travel expenses.

Interest Expense. Interest expense was consistent during the year ended December 31, 2022 compared to the year ended December 31, 2021.

Other Income (Expense), Net. Other income (expense), net was $2.2 million for the year ended December 31, 2022 as compared to an expense of $6.9 million for the year ended December 31, 2021. The income in the current year is attributable to the amortization of purchase discounts on held-to-maturity cash-equivalent investments. During the related prior year comparable period, the expense relates to the remeasurement of our convertible preferred stock warrants and recognition of the change in fair value. As detailed in the notes to our financial statements included herein, the convertible preferred stock warrants were automatically converted into common stock warrants concurrent with our IPO and subsequently exercised in the third quarter of fiscal year 2021.

Cash Flows

The following table summarizes our cash flows for the periods indicated (in thousands):

Net Cash Used in Operating Activities

Net cash used in operating activities for the year ended December 31, 2022 was $76.0 million, consisting primarily of a net loss of $86.2 million and a net change in our operating assets and liabilities of $5.7 million, partially offset by non-cash charges of $16.0 million. The change in our net operating assets and liabilities was primarily due to a $6.8 million increase in accounts receivable and a $3.3 million increase in inventory to support the continued growth of our operations. The Company had a $0.7 million decrease in accounts payable, while accrued compensation, as well as accrued and other current liabilities, increased $4.0 million, driven by the timing of payments on invoices and bonuses. The non-cash charges primarily consisted of $13.0 million related to stock-based compensation, $0.7 million of depreciation, $0.7 of accretion of debt discount and amortization of debt issuance costs, and $0.5 million of noncash operating lease expense.

Net cash used in operating activities for the year ended December 31, 2021 was $52.5 million, consisting primarily of a net loss of $63.0 million and a net change in our operating assets and liabilities of $4.3 million, partially offset by non-cash charges of $14.7 million. The change in our net operating assets and liabilities was primarily due to a $3.7 million increase in accounts receivable, a $3.0 million increase in our prepaid expenses to support the continued growth of our operations, and a $1.3 million increase in inventory. Partially offsetting those changes was a $1.2 million increase in accounts payable, a $1.9 million increase in accrued compensation, and a $0.3 million increase in accrued and other current liabilities, driven by the timing of payments on invoices and bonuses. The non-cash charges primarily consisted of $6.9

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million from the fair value remeasurement of our convertible preferred stock warrants, $5.1 million related to stock-based compensation, $0.7 million of accretion of debt discount and amortization of debt issuance costs, $0.6 million in depreciation and amortization, $0.6 million of noncash operating lease expense, and $0.4 million provision for excess and obsolete inventories.

Net Cash Used in Investing Activities

Net cash used in investing activities in the years ended December 31, 2022 and 2021 was $1.0 and $0.8 million, consisting of purchases of property and equipment.

Net Cash Provided by (Used in) Financing Activities

Net cash provided by financing activities in the year ended December 31, 2022 of $1.2 million primarily relates to proceeds from the exercise of common stock options and proceeds from employee stock purchase plan purchases.

Net cash provided by financing activities in the year ended December 31, 2021 of $252.5 million primarily relates to proceeds from the issuance of common stock, net of related offering costs, of $252.2 million.

Liquidity and Capital Resources

Sources of Liquidity

To date, our primary sources of capital have been private placements of redeemable convertible preferred stock, debt financing agreements, the sale of common stock in our IPO, and revenue from the sale of our products. Since our inception, we have raised an aggregate of approximately $402.4 million in net proceeds from sales of our redeemable convertible preferred stock and common stock and borrowed $32.9 million of net proceeds under our term loans.

As of December 31, 2022, we had cash and cash equivalents of $185.0 million, an accumulated deficit of $239.2 million and $35.0 million outstanding under our term loan agreement (before debt discount). Based on our current planned operations, we expect our cash and cash equivalents and additional borrowings available under the 2020 Term Loan and the 2020 Revolver will enable us to fund our operations for at least the next twelve months and the foreseeable future.

MidCap Loan Agreements

In January 2019, we entered into credit and security agreements with MidCap Financial Services (the "Lender"), which provided a maximum of $25.0 million credit facility consisting of a $20.0 million senior secured term loan (the "2019 Term Loan") and a $5.0 million 2019 revolving loan (the "2019 Revolver" and collectively with the 2019 Term Loan, the “2019 MidCap Credit Facility”). In November 2020, we entered into amended and restated credit and security agreements with the same institution, which replaced the 2019 MidCap Credit Facility, and provided for a maximum of $40.0 million credit facility consisting of a $35.0 million senior secured term loan (the "2020 Term Loan") and a $5.0 million revolving loan (the "2020 Revolver and collectively with the 2020 Term Loan, the “2020 MidCap Credit Facility”).

Our obligations under the 2020 MidCap Credit Facility are guaranteed by us and our future subsidiaries, subject to exceptions for certain foreign subsidiaries. Our obligations under the agreements are secured by substantially all of our assets, including our material intellectual property. Additionally, we are subject to customary affirmative and negative covenants, including covenants that limit or restrict the ability of us to, among other things, incur indebtedness, grant liens, merge or consolidate, make investments, dispose of assets, make acquisitions, pay dividends or make distributions, repurchase stock and enter into certain transactions with affiliates, in each case subject to certain exceptions. As of December 31, 2022, we were in compliance with all financial and non-financial covenants.

The 2019 MidCap Credit Facility and 2020 MidCap Credit Facility each contain events of default that include, among others, non-payment of principal, interest or fees, breach of covenants, inaccuracy of representations and warranties, cross-defaults and bankruptcy and insolvency events.

2020 Term Loan

The 2020 Term Loan agreement amended the maturity date to November 1, 2025 and adjusted the stated floating interest rate to reserve-adjusted SOFR, plus 7.00%. Outstanding principal amounts of Tranche One Loans and Tranche Two Loans borrowed under the 2019 Term Loan were designated as Tranche One Loans and Tranche Two Loans under the

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2020 Term Loan. The Tranche Three Loan commitment amount was increased to $21.0 million and the full amount was drawn in November 2020. Principal payments under the 2020 Term Loan have been extended and are scheduled to begin in December 2023. However, if certain conditions are met, the initiation of principal payments can be delayed to December 2024. We currently expect that we will be in a position to meet the conditions necessary to extend the commencement date for the initiation of principal payments under the 2020 Term Loan from December 1, 2023 to December 1, 2024. In addition, the final payment fee was amended to 6.0%. We are subject to certain financial and non-financial covenants.

We incurred $0.7 million of issuance costs in conjunction with the 2020 Term Loan which were netted against the borrowed funds in the balance sheet and are being accreted using the effective interest method as interest expense over the contractual period of five years.

In conjunction with the funding of the 2020 Term Loan, we issued a 10-year warrant to the Lender to purchase 300,000 shares of our Series F redeemable convertible preferred stock at an exercise price of $21.88 per share, or the 2020 MidCap Warrant, with the estimated fair value of $1.8 million. The 2020 MidCap Warrants were recorded at the fair value as a debt discount and as a warrant liability. The debt discount is being accreted using the effective interest method as interest expense over the contractual period of four years for the 2020 Term Loan.

2020 Revolver

The maturity date of the 2020 Revolver was amended to November 1, 2025 and the stated floating interest rate was adjusted to reserve-adjusted SOFR plus 7.00%. As of December 31, 2022, $5.0 million was available to be drawn under the 2020 Revolver which remains undrawn. Other key terms of the 2020 Revolver remained substantially unchanged compared to those of 2019 Revolver.

Lease Agreements

Our corporate headquarters are located in Menlo Park, California, where we lease approximately 11,000 square feet of office, research and development, engineering and laboratory space pursuant to a lease that commenced on August 1, 2021, and expires on August 31, 2024. We also lease approximately 2,040 square feet of office space, which is primarily used by our commercial leadership team, in Southlake, Texas, pursuant to a lease that commenced on April 30, 2019 and expires on May 15, 2024.

Critical Accounting Estimates

Our financial statements have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP. The preparation of these financial statements requires us to make estimates and assumptions for the reported amounts of assets, liabilities, revenue, 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 and any such differences may be material.

While our significant accounting policies are more fully described in Note 2 to our financial statements included elsewhere in this Annual Report on Form 10-K, we believe the following discussion addresses our most critical accounting policies, which are those that are most important to our financial condition and results of operations and require our most difficult, subjective and complex judgments.

Stock-Based Compensation

We maintain an equity incentive plan that permits the grant of share-based awards, such as stock options and restricted stock units (RSUs), to employees and directors. We recognize equity-based compensation expense for awards of equity instruments based on the grant date fair value of those awards. We estimate the fair value of our stock option awards made to employees and directors based on the estimated fair values as of the grant date using the Black-Scholes option-pricing model, net of estimated forfeitures. The model requires us to make a number of assumptions, including expected volatility, expected term, risk-free interest rate, and expected dividend yield.

The fair value of restricted stock unit ("RSU") awards is determined based on the number of units granted and the closing price of the Company's common stock as of the grant date. We expense the fair value of our equity-based

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compensation awards on a straight-line basis over the requisite service period, which is the period in which the related services are received.

Recent Accounting Pronouncements

See Note 2 to our consolidated financial statements appearing under Part II, Item 8 for more information about recent accounting pronouncements, the timing of their adoption, and our assessment.