10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_____________________________

FORM 10-K

 _____________________________

(Mark One)
☒	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2023

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from            to           

Commission File Number 001-33351

___________________________

NEUROMETRIX, INC.

(Exact name of registrant as specified in its charter)

__________________________

Delaware	04-3308180
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

4B Gill Street, Woburn, Massachusetts	01801
(Address of Principal Executive Offices)	(Zip Code)

(781) 890-9989

(Registrant’s Telephone Number, Including Area Code)

___________________________

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of exchange on which registered
Common Stock, $0.0001 par value per share	NURO	The Nasdaq Stock Market LLC
Preferred Stock Purchase Rights		The Nasdaq Stock Market LLC

Securities registered pursuant to Section 12(g) of the Act

None

____________________________

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes o No ý

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes o No ý

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports); and (2) has been subject to such filing requirements for the past 90 days. Yes ý No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ý No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer o Accelerated filer        o

Non-accelerated filer ý     Smaller reporting company    ☒

Emerging growth company    ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ý

As of June 30, 2023, the last business day of the registrant’s most recently completed second fiscal quarter, the aggregate market value of the voting stock held by non-affiliates of the registrant was $8,183,506 based on the closing sale price of the common stock as reported on the Nasdaq Capital Market on June 30, 2023.

As of February 29, 2024, there were 1,986,540 shares of Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

The following documents (or parts thereof) are incorporated by reference into the following parts of this Form 10-K: Certain information required by Part III of this Annual Report on Form 10-K is incorporated from the Registrant’s Proxy Statement for the Annual Meeting of Stockholders to be held on April 30, 2024 (the 2024 Annual Meeting of Stockholders).

NEUROMETRIX, INC.

ANNUAL REPORT ON FORM 10-K

FOR THE YEAR ENDED DECEMBER 31, 2023

TABLE OF CONTENTS

PART I
Item 1.	Business	1
Item 1A.	Risk Factors	14
Item 1B.	Unresolved Staff Comments	29
Item 1C.	Cybersecurity	29
Item 2.	Properties	30
Item 3.	Legal Proceedings	30
Item 4.	Mine Safety Disclosures	30
PART II
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	31
Item 6.	Reserved	31
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	32
Item 8.	Financial Statements and Supplementary Data	36
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	36
Item 9A.	Controls and Procedures	36
Item 9B.	Other Information	37
Item 9C.	Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	37
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	38
Item 11.	Executive Compensation	40
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	40
Item 13.	Certain Relationships and Related Transactions and Director Independence	40
Item 14.	Principal Accounting Fees and Services	40
PART IV
Item 15.	Exhibits and Financial Statement Schedule	41
Item 16.	Form 10-K Summary	45
Signatures		46

“NEUROMETRIX”, “NC-STAT”, “OptiTherapy”, “ADVANCE”, “SENSUS”, “Quell”, stylized "Q", “DPNCheck” and “NC-stat DPNCHECK” are the subject of either a trademark registration or application for registration in the United States. Other brands, names and trademarks contained in this Annual Report on Form 10-K are the property of their respective owners.

All share amounts in the Annual Report on Form 10-K have been adjusted to reflect a 1-for-8 reverse stock split that was effected on November 21, 2023.

i

PART I

The statements contained in this Annual Report on Form 10-K, including under the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and other sections of this Annual Report, include forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the Exchange Act), including, without limitation, statements regarding our or our management’s expectations, hopes, beliefs, intentions or strategies regarding the future, such as our estimates regarding anticipated operating losses, future revenues and projected expenses, our future liquidity; our belief that there are unmet needs for the management of chronic pain and in the diagnosis and treatment of diabetic neuropathy; our expectations surrounding Quell and DPNCheck; our expected timing and our plans to develop and commercialize our products; our ability to meet our proposed timelines for the commercial availability of our products; our ability to obtain and maintain regulatory approval of our existing products and any future products we may develop; regulatory and legislative developments in the United States and foreign countries; the performance of our third-party manufacturers; our ability to obtain and maintain intellectual property protection for our products; the successful development of our sales and marketing capabilities; the size and growth of the potential markets for our products and our ability to serve those markets; the rate and degree of market acceptance of any future products; our reliance on key scientific management or personnel; the payment and reimbursement methods used by private or government third party payers; our ability to maintain the listing of shares of our common stock on the Nasdaq Capital Market; the ongoing effect of the recently completed reverse stock split of our common stock on the price or trading of our common stock; and other factors discussed elsewhere in this Annual Report on Form 10-K or any document incorporated by reference herein. The words “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “plan” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. The forward-looking statements contained in this Annual Report on Form 10-K are based on our current expectations and beliefs concerning future developments and their potential effects on us. There can be no assurance that future developments affecting us will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond our control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to, those factors described in the section titled “Risk Factors.” Should one or more of these risks or uncertainties materialize, or should any of our assumptions prove incorrect, actual results may vary from those projected in these forward-looking statements. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws. Unless the context otherwise requires, all references to “we”, “us”, the “Company”, or “NeuroMetrix” in this Annual Report on Form 10-K refer to NeuroMetrix, Inc.

ITEM 1. BUSINESS

Our Business — An Overview

NeuroMetrix is a commercial stage neurotechnology company based in Woburn, Massachusetts. The Company’s mission is to improve individual and population health through innovative medical devices and technology solutions for pain syndromes and neurological disorders. Our core expertise in biomedical engineering has been refined over two decades of designing, building and marketing medical devices that stimulate nerves and analyze nerve response for diagnostic and therapeutic purposes. We are fully integrated with in-house capabilities spanning research and development, manufacturing, regulatory affairs and compliance, sales and marketing, product fulfillment and customer support. We hold extensive, proprietary intellectual property.

NeuroMetrix created the market for point-of-care nerve testing and introduced sophisticated wearable technology for chronic pain syndromes. Nearly five million patients have been served with our products. Revenue is derived from the sale of medical devices, after-market consumable products and accessories in the United States and select overseas markets. Products are authorized by the U.S. Food and Drug Administration (FDA) and regulators in foreign jurisdictions where appropriate. We have two principal product categories:

•Therapeutic technology – wearable neuromodulation for chronic pain syndromes

•Diagnostic technology - point-of-care peripheral neuropathy assessment

Chronic pain is a significant public health problem. It is defined by the National Institutes of Health (NIH) as pain lasting more than 12 weeks. This contrasts with acute pain which is a normal bodily response to injury or trauma. Chronic pain conditions include low back pain, arthritis, fibromyalgia, neuropathic pain, and cancer pain, among many others. Chronic pain

1

may be triggered by an injury or there may be an ongoing cause such as disease or illness. There may also be no clear cause. Chronic pain can also lead to other health problems which can include fatigue, sleep disturbance and mood changes, which cause difficulty in carrying out important activities and contributing to disability and despair. In general, chronic pain cannot be cured. Treatment of chronic pain is focused on reducing pain and improving function. The goal is effective pain management.

Chronic pain affects nearly 100 million adults in the United States and more than 1.5 billion people worldwide. The estimated incremental impact of chronic pain on health care costs in the United States is over $250 billion per year, and lost productivity is estimated to exceed $300 billion per year. The most common approach to chronic pain management is pain medication. This includes over-the-counter (OTC) internal and external analgesics as well as prescription pain medications, both non-opioid and opioids. The approach to treatment is individualized, drug combinations may be employed, and the results are often inadequate. Side effects, including the potential for addiction are substantial. Reflecting the complexity of chronic pain and the difficulty in treating it, we believe that inadequate relief leads 25% to 50% of pain sufferers to seek alternatives to prescription pain medications. These alternatives include nutraceuticals, acupuncture, chiropractic care, non-prescription analgesics, electrical stimulators, braces, sleeves, pads and other items. In total, these pain relief products and services account for approximately $20 billion in annual out-of-pocket spending in the United States.

Nerve stimulation is a long-established category of treatment for chronic pain. This treatment approach is available through implantable devices which have both surgical and ongoing risks, such as migration of the implanted nerve stimulation leads. Non-invasive approaches involving transcutaneous electrical nerve stimulation (TENS) have achieved limited efficacy in practice due to power limitations, inadequate dosing and low patient adherence. We believe that our Quell wearable technology for chronic pain is designed to address many of the limitations of traditional TENS.

Peripheral neuropathies, or polyneuropathies, are diseases of the peripheral nerves. They affect about 10% of adults in the United States, with the prevalence rising to over 30% among individuals 65 years and older. Peripheral neuropathies are associated with loss of sensation, pain, increased risk of falling, weakness, and other complications. People with peripheral neuropathies have a diminished quality of life, poor overall health and higher mortality. The most common specific cause of peripheral neuropathies, accounting for about one-third of cases, is diabetes. Diabetes is a worldwide epidemic with an estimated affected population of over 400 million people. Within the United States there are over 30 million people with diabetes and another 80 million with pre-diabetes. The annual direct cost of treating diabetes in the United States exceeds $100 billion. Although there are dangerous acute manifestations of diabetes, the primary burden of the disease is in its long-term complications which include cardiovascular disease, nerve disease and resulting conditions such as foot ulcers which may require amputation, eye disease leading to blindness, and kidney failure. The most common long-term complication of diabetes, affecting over 50% of the diabetic population, is peripheral neuropathy. Diabetic peripheral neuropathy (DPN) is the primary trigger for diabetic foot ulcers which may progress to the point of requiring amputation. People with diabetes have a 15 to 25% lifetime risk of foot ulcers and approximately 15% of foot ulcers lead to amputation. Foot ulcers are the most expensive complication of diabetes with a typical cost of $5,000 to $50,000 per episode. In addition, between 16% and 26% of people with diabetes suffer from chronic pain in their feet and lower legs.

Early detection of peripheral neuropathies, such as DPN, is important because there are no treatment options once the nerves have degenerated. Currently available diagnostic methods for peripheral neuropathies range from a simple monofilament test for lack of sensory perception in the feet to a nerve conduction study performed by a specialist. Our DPNCheck nerve conduction technology provides a rapid, low cost, quantitative test for peripheral neuropathies, including DPN. It addresses an important medical need and is particularly effective in screening large populations. DPNCheck has been validated in multiple clinical studies.

Business Strategy

Our leading commercial products, and the focus of our strategic attention, are Quell and DPNCheck.

Quell is our wearable neuromodulation technology for chronic pain. It has been refined over the past seven years with feedback from over 204,000 chronic pain patients and is protected by over 20 U.S. utility patents. Patients control and personalize the technology with a mobile phone app, and their utilization of the devices and certain clinical metrics may be tracked in the Quell Health Cloud. The degree of technological sophistication, combined with our extensive consumer experience and the compelling results of clinical studies, gives us the opportunity to leverage this technology base into a portfolio of Quell-based prescription (Rx) wearable neurotherapeutics.

2

In 2021, Quell received Breakthrough Device Designation from the FDA for a fibromyalgia indication. A pivotal double-blind, randomized, sham-controlled clinical study of Quell - Fibromyalgia was completed, and a De Novo marketing authorization was obtained from the FDA in 2022. Quell – Fibromyalgia is indicated for use as an aid for reducing the symptoms of fibromyalgia in adults with high pain sensitivity. This Rx product was introduced to the domestic market in late 2022 under the auspices of a controlled, strategic commercial launch in order to broaden market awareness and our understanding of market dynamics.

Quell also received FDA Breakthrough Device Designation in early 2022 for the treatment of chronic Chemotherapy Induced Peripheral Neuropathy (CIPN). A CIPN double-blind, randomized, sham-controlled clinical study employing Quell, funded by the National Cancer Institute (NCI) and the NIH, was completed in 2023. A 510(k) application, which is required for pre-market review and clearance by FDA of pre-market notification, has been filed with FDA for marketing authorization for CIPN patients with moderate to severe neuropathic pain and cramps. Review and approval of the application by FDA could lead to market introduction of Quell - CIPN in late 2024. This would be the second product in our emerging portfolio of Quell-based Rx wearable therapeutics. We plan a similar approach to other disease indications involving chronic pain. These potentially include Fibromyalgia-like Long COVID, Chronic Low Back Pain, and Chronic Overlapping Pain Conditions (COPC).

DPNCheck is our well-established testing technology for peripheral neuropathies. This technology has been evaluated in multiple clinical studies and promoted both in the domestic Medicare Advantage (MA) market and also in the Asian markets of Japan and China. MA has historically contributed the majority of DPNCheck revenue and been the driver of product-line growth.

In early 2023, the Centers for Medicare and Medicaid (CMS) proposed significant changes to its MA Hierarchical Condition Categories (HCC) risk adjustment payments and to its MA Risk Adjustment Data Validation (RADV) audit practices. These changes created significant uncertainty in the market among participating healthcare providers and insurers. Subsequently, CMS confirmed that RADV changes would be implemented immediately and applied retroactively, and that changes in HCC payments would be phased in over a three-year period. The changes to HCC risk factor coding significantly reduced CMS payments for population screening for various conditions, including for neuropathy. During 2023 we experienced a significant reduction in MA sales as a result of these CMS reimbursement changes. As a result, we reduced our commercial sales team while continuing to support our customer base and working to attract new accounts. However, it appears unlikely that there will be a near-term recovery from the decline in revenue of the DPNCheck MA business. DPNCheck sales in Asian markets have remained consistent between the past two years and unaffected by the reimbursement changes in MA.

ADVANCE is a legacy, point-of-care neurodiagnostic technology primarily used for the diagnosis and screening for carpal tunnel syndrome (CTS). Manufacturing of ADVANCE devices was discontinued in 2012; however, we continue to service devices and provide disposable electrodes to a customer base of hand surgeons and manufacturers for industrial health use.

Research and Development for Competitive Advantage 

Our products are proprietary and were developed in-house by our research and development team. We believe that continual product innovation, focusing on our unique competency of precision neurostimulation, is essential to profitable growth and competitive advantage. Our 2024 research and development efforts are focused in two areas important to our future: 1) further development of the Quell technology platform of disease-specific wearable neuromodulation products for chronic pain and related symptoms and 2) improvement of our enterprise integration and health analytics tools for DPNCheck users.

Business Model

Our products consist of a medical device used in conjunction with a consumable electrode or biosensor. Other accessories and consumables are also available to customers. Our goal is to develop active, installed user bases regularly ordering or subscribing to aftermarket products. Our DPNCheck, Quell and ADVANCE products all conform to this business model.

3

Primary Marketed Products

Quell

Quell is a wearable device for symptomatic relief and management of chronic pain indications. It incorporates a collection of proprietary approaches designed to optimize the effectiveness of nerve stimulation. These include high power electrical stimulation hardware with precise control, algorithms that automatically determine therapeutic stimulation intensity and compensate for nerve desensitization, and automated detection of user sleep and appropriate adjustment of stimulation level. Quell is comprised of (1) an electronic device that is placed in a flexible band worn on the upper calf; (2) an electrode that attaches to the device and is the interface between the device and the skin; and (3) a smartphone app to control the device and visualize, understand and optimize data relating to chronic pain and health. The app is integrated with the Quell Health Cloud for storage of user data, data analytics and scientific research. An Apple Watch® app provides many of the functions of the smartphone app with the convenience of a smartwatch. The Quell device is lightweight and can be worn during the day while active, and at night while sleeping. It has been authorized by the FDA for symptomatic relief and management of lower extremity chronic pain and as an aid for reducing the symptoms of fibromyalgia in adults with high pain sensitivity. Cumulatively through 2023, over 204,000 Quell devices have been shipped to customers.

DPNCheck

DPNCheck is a fast, accurate, and quantitative nerve conduction test that is used to evaluate peripheral neuropathies (also called polyneuropathies or systemic neuropathies) such as DPN. It is designed to be used by primary care physicians, endocrinologists, podiatrists and other clinicians at the point-of-care to objectively detect, stage, and monitor peripheral neuropathies. The device measures nerve conduction velocity and response amplitude of the sural nerve, a nerve in the lower leg and ankle. These parameters are recognized as sensitive and specific biomarkers of peripheral neuropathies. DPNCheck is comprised of: (1) an electronic hand-held device and (2) a single patient-use biosensor (limited biosensor re-use is allowed in certain international markets). In addition, we provide users with PC-based software that links to the device via a USB connection thereby allowing physicians to generate reports, manage their test data and integrate with enterprise systems including electronic medical record (EMR) systems.

DPNCheck is a modified version of our previously marketed NC-stat nerve testing device that has the same clinical indications with respect to peripheral neuropathies. While lower in cost than the original device, DPNCheck has the same functionality with respect to sural nerve testing. Over 4 million patient studies have been performed using our NC-stat technology. Our nerve testing technology has been the subject of over 50 peer-reviewed publications, including over 30 studies specifically addressing the accuracy and clinical utility of the DPNCheck device in the assessment of DPN and other peripheral neuropathies. Cumulatively through 2023, over 9,000 DPNCheck devices have been shipped to customers.

ADVANCE

The ADVANCE System is a part of our legacy neurodiagnostics business. It is a comprehensive platform for the performance of nerve conduction studies. The ADVANCE System is comprised of (1) the ADVANCE device and related modules; (2) various types of electrodes; and (3) a communication hub that enables a physician’s office to network the device to its office computers and to our servers for data archiving and report generation. The ADVANCE System is used with proprietary nerve specific electrode arrays. These electrode arrays combine multiple individual electrodes and embedded microelectronic components into a single patient-use disposable unit. We supply the market with a number of different nerve-specific electrode arrays. The manufacturing of ADVANCE devices was discontinued in 2012. However, we continue to provide disposable electrodes to a customer base of hand surgeons and manufacturers for industrial health use.

Historically, the ADVANCE System was marketed to a broad range of physician specialties including neurologists, orthopedic surgeons, primary care physicians, and endocrinologists, and utilized for a variety of different clinical indications including assessment of CTS, low back and leg pain, and DPN. It is most commonly used in the assessment of CTS. Over 20 peer-reviewed studies have been published on the use of the ADVANCE System in its clinical application. As of December 31, 2023, we had an installed base of approximately 40 active customers for the ADVANCE System.

The following chart summarizes our previously and currently marketed products.

4

Product	Time on Market	Technology	Primary Clinical Indications	No. Patients Tested/Treated
Quell	Q2 2015 – present	Transcutaneous Electrical Nerve Stimulation	Symptomatic and management relief of lower extremity chronic pain (OTC) and fibromyalgia (Rx)	> 204,000
SENSUS	Q1 2013 – Q4 2020	Transcutaneous Electrical Nerve Stimulation	Symptomatic relief and management of chronic pain (Rx)	> 11,000
DPNCheck	Q4 2011 – present	Nerve Conduction	Evaluation of peripheral neuropathies	> 2,500,000
ADVANCE	Q2 2008 – present	Nerve Conduction	Evaluation of entrapment and systemic neuropathies	> 1,960,000 (ADVANCE and NC-stat)
NC-stat	Q2 1999 – Q3 2010	Nerve Conduction	Evaluation of entrapment and systemic neuropathies

Customers

DPNCheck customers include managed care organizations, endocrinologists, podiatrists and primary care physicians in the United States and distributors in Japan and China. Through December 31, 2023, over 9,000 DPNCheck devices have been shipped to customers. Quell customers are primarily located in the United States. Through December 31, 2023, over 204,000 Quell devices have been shipped. Our legacy ADVANCE System customers include approximately 40 active accounts covering occupational health, primary care, internal medicine, orthopedic and hand surgeons, pain medicine physicians, neurologists, physical medicine and rehabilitation physicians, and neurosurgeons.

At December 31, 2023, three customers accounted for 74% of accounts receivable and two customers accounted for 34% of revenue.

Sales, Marketing, and Distribution

Our U.S. sales efforts for DPNCheck primarily focus on MA organizations and providers who assume financial responsibility and the associated risks for the health care costs of their patients. We believe that DPNCheck presents an attractive clinical case with detection of peripheral neuropathy allowing for earlier clinical intervention to help mitigate the effects of peripheral neuropathy on both patient quality of life and cost of care. Outside the United States, DPNCheck is sold in Japan by our distribution partner Fukuda Denshi Co., Ltd. and in China by Omron Medical (Beijing) Ltd. Sales and marketing efforts for DPNCheck are led by our Senior Vice President, Population Health and Value Based Care.

Quell – Fibromyalgia is available in the United States via HealthWarehouse.com, an online pharmacy. An Rx is required for purchase. The Company is conducting a strategic launch of this product to optimize its marketing strategy. Quell (OTC) for lower extremity chronic pain is no longer available to new customers. Sales and marketing efforts for Quell are led by our National Sales Director, Neuromodulation.

Customer Service handles domestic ADVANCE accessory sales and support. A small network of independent distributors in several European countries support ADVANCE in their jurisdictions.

5

Manufacturing and Supply

We perform final assembly and servicing of our Quell and DPNCheck devices at our manufacturing facility in Massachusetts. The ADVANCE device is no longer in production; however, we continue to sell accessories and repair services. Outside suppliers provide the sub-assemblies and components that we use in manufacturing Quell and DPNCheck, as well as our consumable products including biosensors and electrodes. Reflecting the relatively small volumes of our products being manufactured and sold, we do not have alternative suppliers for many of the key components of our products. Rather, we rely on regular contact and close working relationships with local suppliers developed over many years. In outsourcing, we target companies that meet FDA, International Organization for Standardization (ISO), and other quality standards supported by internal policies and procedures. Supplier performance is maintained and managed through a corrective action program ensuring all product requirements are met or exceeded. Following the receipt of products or product components from our third-party manufacturers, we conduct the necessary inspection, final assembly, packaging, and labeling at our manufacturing facility. We believe that our manufacturing relationships minimize our capital investment, provide us with manufacturing expertise, and help control costs.

A New England regional supplier has been manufacturing devices and providing sub-assemblies to us since 2005. The supplier currently manufactures sub-assemblies for Quell and DPNCheck. A supplier based in the central United States has been manufacturing ADVANCE electrodes for us since 1999. A full-service original equipment manufacturer (OEM) also based in the central United States and specializing in medical and cosmetic devices, manufactures DPNCheck biosensors and Quell electrodes.

We are registered with the FDA and subject to compliance with FDA quality system regulations. As a registered device manufacturer, we undergo scheduled FDA quality system inspections, are subject to inspections by state agencies and, if deemed necessary by the FDA, additional inspections may occur. We are also ISO registered and undergo annual quality system audits for regulatory compliance by TÜV SÜD. ADVANCE and DPNCheck are cleared for marketing within the United States and Canada. DPNCheck is also cleared for marketing in Japan and China. Quell is authorized for marketing in the United States.

Research and Development

We believe that we have research and development (R&D) capability that is unique to the industry with over two decades of experience in developing diagnostic and therapeutic devices involving the precision nerve stimulation and measurement of nerve signals for clinical purposes. Our company has extensive experience in neurophysiology, biomedical instrumentation, signal processing, biomedical sensors, and information systems.

Our R&D team works closely with marketing and customers to design products that are focused on improving clinical outcomes. The team of seven engineers includes one member who holds an M.D. Our founder and Chief Executive Officer leads R&D and coordinates our clinical program. He holds both an M.D. and a Ph.D.

R&D efforts planned for 2024:

•DPNCheck. In 2024 we will continue to focus on supporting customer adoption of our DPNCheck technology, technology maintenance, and further development of the software ecosystem beyond the patient test itself to covering the broader healthcare enterprise. The primary features of the ecosystem incorporate development of a DPNCheck data cloud where test information is aggregated for an enterprise-wide view of testing, and also to enable the transmission of patient data to EMR.

•Quell Rx Wearable Therapeutic Initiative. We continue to develop the Quell Rx portfolio for chronic pain. Quell Fibromyalgia is in the market and available commercially. Our next therapeutic target is CIPN, the subject of a recent multi-center, double blind, randomized, sham-controlled trial. We have filed a premarket notification (510(k)) with the FDA for moderate to severe neuropathic pain and muscle cramps in patients with CIPN. R&D efforts will encompass supporting the FDA review process while developing CIPN-specific product features including a customized mobile app and digital health integration which will be essential to marketing launch.

6

•Clinical studies for our wearable technology. We plan to continue efforts to build the body of evidence from independent, external clinical studies that is foundational to our Quell initiative.

Clinical Program

Our clinical program operates under the direction of our Chief Executive Officer. This may from time to time be comprised of internal, collaborative, and external clinical studies. Internal clinical studies are designed and implemented directly by us for the purposes of product design and early clinical validation. Collaborative studies are conducted with leading researchers around the world to provide clinical validation and to explore the clinical utility of our products. External studies are entirely independent of us, although in many cases the researchers request unrestricted grants for financial and/or material support, such as providing devices and consumables. External studies may examine the clinical performance and utility of our products, or use our products for outcomes measures. We actively seek to publish clinical study results in leading peer-reviewed journals while also encouraging our clinical collaborators and clinical study grant recipients to do the same. In 2024, we expect that our clinical program will be limited to external studies.

Competition

The Quell technology falls within the crowded TENS category which encompasses a wide number of neurostimulation devices, the majority of which are imported from Asia-based manufacturers. However, we believe there is no direct competition to our Quell technology with the level of power, sophistication, and user-friendly features for the symptomatic relief of chronic pain. The most common approach to chronic pain is pain medication. This includes OTC drugs (such as Advil and Motrin), and Rx drugs including anti-convulsants (such as Lyrica and Neurontin) and anti-depressants (such as Cymbalta and Elavil). Topical creams may also be used (such as Zostrix and Bengay). With severe pain, narcotic or opioid pain medications may be prescribed (such as codeine, fentanyl, morphine, and oxycodone). The approach to treatment is individualized, where drug combinations may be employed, but the results are often inadequate. Side effects, including the potential for addiction, are substantial.

Reflecting the difficulty in treating chronic pain, inadequate relief leads many pain sufferers to turn to the OTC market for supplements or alternatives to Rx pain medications. These include non-Rx medications, topical creams, lotions, TENS devices, dietary products, braces, sleeves, pads and other items. In the United States, over $4 billion is spent annually on such pain relief products.

Nerve stimulation is an established treatment for chronic pain. It is available through implantable spinal cord stimulation; however, this approach requires surgery and has attendant risks. Non-invasive approaches to neurostimulation have achieved limited success in practice due to device limitations, inadequate dosing and low patient adherence. We believe that our Quell – Fibromyalgia wearable technology whose Rx indications make it the only FDA authorized non-pharmaceutical treatment for fibromyalgia, and its personalized features including app control, high power and automation, and digital health integration characteristics place it in a unique neurostimulation category without direct competition. Further, we expect that our initiative to build a portfolio of Quell-based Rx wearable neurotherapeutics will, if successful, significantly reduce or eliminate direct competition from TENS devices.

We believe that DPNCheck is currently the only objective and standardized test for peripheral neuropathies widely available at the point-of-care. The American Diabetes Association and other organizations recommend at least annual evaluation of all people with diabetes for DPN. Due to cost and availability, the evaluation is typically performed using a simple (5.07/10g) monofilament. The method is subjective and only identifies late-stage neuropathy where intervention is generally limited to foot care. Experts in the field have indicated that there is an unmet need for a practical, objective, and sensitive test for diabetic neuropathy that can be widely deployed in the regular care of all people with diabetes. Monofilaments (5.07/10g) are a commodity sold by multiple medical supply companies.

There are several companies that sell neurodiagnostic devices that may compete with our ADVANCE System. These companies include Cadwell Laboratories, Inc. and Natus Medical Incorporated, both of which have substantially greater financial resources than we have. Natus Medical Incorporated and Cadwell Laboratories, Inc. have effective worldwide distribution channels for supplying medical instruments to neurologists and physical medicine and rehabilitation physicians.

7

Intellectual Property

We rely on a combination of patents, trademarks, copyrights, trade secrets, and other intellectual property laws, nondisclosure agreements and other measures to protect our proprietary technology, intellectual property rights, and know-how. We hold issued utility patents covering a number of important aspects of our Quell, SENSUS, DPNCheck and ADVANCE products. We believe that in order to have a competitive advantage, we must develop and maintain the proprietary aspects of our technologies. We also require our employees, consultants and advisors, whom we expect to work on our products, to agree to disclose and assign to us all inventions conceived, or developed using our property, or which relate to our business. Despite any measures taken to protect our intellectual property, unauthorized parties may attempt to copy aspects of our products or to obtain and use information that we regard as proprietary.

Patents

As of December 31, 2023, we had 48 issued U.S. patents, 41 issued foreign patents, and 22 patent applications. Our wearable therapeutic products have 26 issued U.S. utility patents, 23 foreign utility patents, 10 issued U.S. design patents plus 11 issued foreign design patents. We also have 22 patent applications related to our wearable therapeutic products (10 U.S. and 12 foreign). For our DPNCheck diagnostic device, 11 utility patents (4 U.S. and 7 foreign) were issued that cover the core technology.

With regard to our legacy neurodiagnostic products, our issued design patents began to expire in 2015, and our issued utility patents began to expire in 2017. We have additional patents and patent applications directed to other novel inventions that extend patent terms into 2024 to 2031.

The medical device industry is characterized by the existence of a large number of patents and frequent litigation based on allegations of patent infringement. Patent litigation can involve complex factual and legal questions, and its outcome is uncertain. Any claim relating to infringement of patents that is successfully asserted against us may require us to pay substantial damages. Even if we were to prevail, any litigation could be costly and time-consuming and would divert the attention of our management and key personnel from our business operations. Our success will also depend in part on our not infringing patents issued to others, including our competitors and potential competitors. If our products are found to infringe the patents of others, our development, manufacture, and sale of these potential products could be severely restricted or prohibited. In addition, our competitors may independently develop similar technologies. Because of the importance of our patent portfolio to our business, we may lose market share to our competitors if we fail to protect our intellectual property rights.

A patent infringement suit brought against us may force us or any strategic partners or licensees to stop or delay developing, manufacturing, or selling potential products that are claimed to infringe a third-party’s intellectual property, unless that party grants us rights to use its intellectual property. In such cases, we may be required to obtain licenses to patents or proprietary rights of others in order to continue to commercialize our products. However, we may not be able to obtain any licenses required under any patents or proprietary rights of third parties on acceptable terms, or at all. Even if we were able to obtain rights to the third-party’s intellectual property, these rights may be non-exclusive, thereby giving our competitors access to the same intellectual property. Ultimately, we may be unable to commercialize some of our potential products or may have to cease some of our business operations as a result of patent infringement claims, which could severely harm our business.

Trademarks

We hold domestic registrations for the trademarks NEUROMETRIX, Quell, stylized Q, Quell Health Cloud, DPNCheck, SENSUS, NC-stat, ADVANCE, and NC-stat DPNCheck. We use a trademark for Wearable Pain Relief Technology and Therapy Autopilot. We hold certain foreign registrations for the marks NEUROMETRIX, Quell, OptiTherapy, and NC-stat.

Third-Party Reimbursement

Procedures performed with our neurodiagnostic medical devices including ADVANCE and DPNCheck may be paid for by third-party payers, including government health programs, such as Medicare, and private insurance and managed care organizations. The 2024 Physicians Fee Schedule published by the CMS includes CPT 95905 for nerve conduction studies performed with pre-configured electrode arrays such as those used with the DPNCheck device and the ADVANCE System.

8

We believe that physicians are generally receiving reimbursement under CPT 95905 from Medicare for nerve conduction studies performed for CTS using pre-configured electrode arrays that meet the medical necessity requirements in their local Medicare region but that commercial insurers are generally not providing reimbursement. Reimbursement by third-party payers is an important element of success for medical device companies. We do not foresee a significant near-term improvement in reimbursement for procedures performed with ADVANCE and DPNCheck.

In the United States, some insured individuals receive their medical care through managed care programs which monitor and, for payment purposes, often require pre-approval of the services that a member’s provider prescribes. Some managed care programs pay their providers a predetermined annual payment per member which puts the providers at financial risk for the services provided to their members. Our domestic sales efforts for DPNCheck have been focused on the MA program. The MA program is administered by CMS and operated by private managed care organizations or insurers referred to as Medicare Advantage organizations (MAOs). CMS pays these MAOs capitated fees that are adjusted under CMS’s risk adjustment model, which uses health status indicators, or risk scores, to ensure the adequacy of payment. Members with higher risk codes generally require more healthcare resources than those with lower risk codes. In turn, the MAOs fully absorb the risk of patient health care costs. MAOs may share a portion of the risk with provider organizations such as independent practice associations (IPAs) with whom they contract to provide medical services to their members. Proper assessment of each member’s health status and accurate coding helps to assure that MAOs receive capitation fees consistent with the CMS risk adjustment model.

The MA program experienced significant change during 2023 as CMS issued a new rule regarding the MA RADV program that is used to recover improper risk adjustment payments made to MAOs and also issued its 2024 Medicare Advantage Advance Notice, which confirmed substantial changes to the HCC risk adjustment model for calendar year 2024. These changes to RADV and to HCC significantly limited patient screening for various conditions, including for peripheral neuropathy, which had an adverse effect on DPNCheck testing and revenue during 2023. We do not expect any further changes during 2024 in the CMS risk adjustment model as it relates to neuropathy.

Our success in selling DPNCheck and ADVANCE will depend upon, among other things, our customers receiving, and our potential customers’ expectation that they will receive sufficient reimbursement or patient capitated premium adjustments from third-party payers for procedures or therapies using these products. We expect that Quell will generally not be reimbursed by third-party payers in the near future. See “Risk Factors - If health care providers are unable to obtain sufficient reimbursement or other financial incentives from third-party health care payers related to the use of our products other than Quell, their adoption and our future product sales will be materially adversely affected.”

FDA and Other Governmental Regulation

FDA Regulation

Our products are medical devices that are subject to extensive regulation by the U.S. FDA under the Federal Food, Drug, and Cosmetic Act (FDCA), and the regulations promulgated thereunder, as well as by other regulatory bodies in the United States and abroad. The FDA classifies medical devices into one of three classes based on the risks associated with the medical device and the controls deemed necessary to reasonably ensure the device’s safety and effectiveness. Those three classes are:

•Class I: The lowest risk products, which require compliance with medical device general controls, including labeling, establishment registration, device product listing, adverse event reporting and, for some products, adherence to good manufacturing practices through the FDA’s quality system regulations.

•Class II: Comprising moderate-risk devices, which also require compliance with general controls and in some cases, so-called special controls that may include performance standards, particular labeling requirements, or post-market surveillance obligations; typically a Class II device also requires pre-market review and clearance by FDA of a pre-market notification (510(k) application) as well as adherence to the quality system regulations/good manufacturing practices for devices; and

•Class III: High-risk devices that are often implantable or life-sustaining, which also require compliance with the medical device general controls and quality system regulations, but which generally must be approved by FDA before entering the market, through a more-lengthy pre-market approval (PMA) application. Approved PMAs can include post-approval conditions and post-market surveillance requirements, analogous to some of the special controls that may be imposed on Class II devices.

9

Before being introduced into the U.S. market, our products must obtain marketing clearance or approval from FDA through the 510(k) pre-market notification process, or the De Novo classification process (summarized below under De Novo Classification Process (the PMA process)), unless they are determined to be Class I devices or to otherwise qualify for an exemption from one of these available forms of pre-market review and authorization by the FDA. To date, our products have all been classified as Class II, moderate-risk medical devices and have been subject to the 510(k) or the De Novo review and clearance process. See “Risk Factors - We are subject to extensive regulation by the FDA which could restrict the sales and marketing of Quell, DPNCheck and ADVANCE, as well as other products for which we may seek FDA clearance or approval and could cause us to incur significant costs.”

510(k) Pre-Market Notification Process

Class II devices typically require pre-market review and clearance by the FDA, which is accomplished through the submission of a 510(k) pre-market notification before the device may be marketed. To obtain 510(k) clearance, we must demonstrate that a new device is substantially equivalent to another device with 510(k) clearance or grandfathered status, or to a device that was reclassified from Class III to Class II or Class I - this device to which the new device is compared is called the “predicate device.” In some cases, we may be required to perform clinical trials to support a claim of substantial equivalence. If clinical trials are required, we may be required to submit an application for an investigational device exemption (IDE), which must be cleared by the FDA prior to the start of a clinical investigation, unless the device and clinical investigation are considered non-significant risk by the FDA or are exempt from the IDE requirements. Whether or not an IDE is required for a clinical study involving a medical device, an appropriate Institutional Review Board (IRB) must review and approve the study protocol before it is initiated. It generally takes three months from the date of the pre-market notification submission to obtain a final 510(k) clearance decision from the FDA, but it can be significantly longer.

After a medical device receives a 510(k) clearance letter, which authorizes commercial marketing of the new device for one or more specific indications for use, any modification that could significantly affect its safety or effectiveness, or that would constitute a major change in its intended use, requires the submission of a new 510(k) notification or could require De Novo classification or a PMA. The FDA allows each company to make this determination, but the FDA can review the decision as part of routine compliance audits of the company. If the FDA disagrees with a company’s decision not to seek prior FDA authorization, the FDA may require the company to seek additional 510(k) clearance or pre-market approval. The FDA also can require the company to cease marketing and/or recall the medical device in question until its regulatory status is resolved.

De Novo Classification Process

If the FDA determines that a new, previously unclassified medical device or its intended use is not substantially equivalent to a predicate device, the device is automatically placed into Class III, requiring the submission of a PMA. Devices that cannot be cleared through the 510(k) process due to lack of a predicate device but would be considered low or moderate risk (in other words, they do not rise to the level of requiring the approval of a PMA because any risks associated with the device could be mitigated through general controls and/or special controls) may be eligible for the 510(k) De Novo classification process. If a product is classified as Class II through the De Novo classification process, then that device may serve as a predicate device for subsequent 510(k) pre-market notifications.

FDA has issued a Guidance document that formally codifies requirements for the medical device De Novo process and the procedures and criteria for product developers to file a De Novo classification request. FDA’s activities to create predictability, consistency, and transparency for innovative medical device developers may benefit the medical technology industry as a whole.

10

PMA Application Process

If a medical device does not qualify for the 510(k) pre-market notification process and is not eligible for classification as a low or moderate-risk device through the De Novo process, the device is deemed to be Class III and a company must submit a PMA application to seek authorization for its commercial sale. A PMA requires more extensive pre-filing testing than is required in the 510(k) application and is more costly, lengthy and uncertain. The PMA review and approval process can take one to three years or longer, from the time the PMA application is filed with the FDA. Under a PMA, the company must demonstrate to the FDA that the new medical device is safe and effective for its intended purpose. A PMA typically includes extensive pre-clinical and clinical trial data, and information about the device, its design, manufacture, labeling and components. Before approving a PMA, the FDA generally also performs an on-site inspection of manufacturing facilities for the product to ensure compliance with the FDA’s quality system regulation (QSR).

If FDA approves the PMA, the approved indications may be more limited than those originally sought. In addition, FDA’s approval order may include post-approval conditions that the FDA believes necessary to ensure the safety and effectiveness of the device, including, among other things, restrictions on labeling, promotion, sale and distribution and post-market study requirements. Failure to comply with the post-approval conditions can result in adverse enforcement or administrative actions, including the withdrawal of the approval. Approval of a new PMA application or a PMA supplement may be required before making certain types of modifications to the device, including to its labeling, intended use or indication, or manufacturing process, especially when such modifications have the potential to affect safety and effectiveness.

Post-Marketing Compliance Obligations

Regardless of which pre-market pathway a medical device uses to reach the U.S. market, after a device is placed on the market, numerous regulatory requirements continue to apply. These include:

•the FDA’s QSR, which requires manufacturers, including third-party manufacturers, to follow stringent design, testing, control, documentation and other good manufacturing practice and quality assurance procedures during all aspects of the manufacturing process (unless a device category is exempt from this requirement by the FDA, such as in the case of many Class I devices);

•labeling regulations and FDA prohibitions against the promotion of products for uncleared or unapproved uses (known as off-label uses), as well as requirements to provide adequate information on both risks and benefits;

•medical device reporting regulations, which require that manufacturers report to FDA any event that the company learns of in which a device may have caused or contributed to a death or serious injury or malfunctioned in a way that would likely cause or contribute to a death or serious injury if the malfunction were to recur;

•correction and removal reporting regulations, which require that manufacturers report to the FDA field corrections and device recalls or removals if undertaken to reduce a risk to health by the device or to remedy a violation of the FDA caused by the device that may present a risk to health;

•post-market surveillance regulations, which apply to Class II or III devices if the FDA has issued a post-market surveillance order and the failure of the device would be reasonably likely to have serious adverse health consequences, the device is expected to have significant use in the pediatric population, the device is intended to be implanted in the human body for more than one year, or the device is intended to be used to support or sustain life and to be used outside a user facility;

•regular and for-cause inspections by FDA to review a manufacturer’s facility and its compliance with applicable FDA requirements; and

•the FDA’s recall authority, whereby it can ask, or order, device manufacturers to recall from the market a product that is in violation of applicable laws and regulations.

Regulatory Approvals and Clearances

The ADVANCE System received 510(k) clearance as a Class II medical device in April 2008 for its intended use by physicians to perform nerve conduction studies and needle electromyography procedures.

The NC-stat System is also a Class II medical device and has been the subject of several 510(k) clearances, most recently in July 2006 (K060584). The NC-stat System is cleared for use to stimulate and measure neuromuscular signals that are useful

11

in diagnosing and evaluating systemic and entrapment neuropathies. Our NC-stat DPNCheck, or DPNCheck, device is a technical modification to the 510(k) cleared NC-stat device and has the same intended use, and therefore does not raise safety or effectiveness questions that would require a separate 510(k) submission under the FDA’s published guidance on 510(k) requirements for modified devices.

As transcutaneous electrical nerve stimulators, the SENSUS and Quell pain therapy devices are Class II medical devices that received 510(k) clearance from the FDA in August 2012 and July 2014, respectively. In November 2012, the FDA provided 510(k) clearance for the disposable electrode used in conjunction with the SENSUS device, and in July 2013, the FDA provided 510(k) clearance for the use of SENSUS during sleep. The intended use of the SENSUS pain management therapeutic system is the symptomatic relief and management of chronic pain. The SENSUS device is no longer marketed and, where possible, we have transitioned SENSUS customers to Quell. In July 2014, our Quell device received 510(k) clearance for over-the-counter use and in November 2014, our Quell disposable electrode received 510(k) clearance for over-the-counter use. In January 2016, a number of new features were added to Quell and received 510(k) clearance, most notably use with an optional mobile app that contains several convenience features. The intended use of the Quell pain management therapeutic system is the symptomatic relief and management of chronic pain. The Quell device may also be used during nighttime sleep.

Quell – Fibromyalgia is a transcutaneous electrical nerve stimulator employing our core Quell technology. Its intended use was not substantially equivalent to an existing predicate device; however, it was considered low to moderate risk. FDA accepted the eligibility of Quell – Fibromyalgia as a 510 (k) De Novo submission and provided the device with De Novo authorization in May 2022.

Federal Trade Commission Regulatory Oversight

We are subject to Federal Trade Commission (FTC) regulatory oversight. Under the Federal Trade Commission Act (FTC Act), the FTC is empowered, among other things, to (a) prevent unfair methods of competition and unfair or deceptive acts or practices in or affecting commerce; (b) seek monetary redress and other relief for conduct injurious to consumers; and (c) gather and compile information and conduct investigations relating to the organization, business, practices, and management of entities engaged in commerce. The FTC has very broad enforcement authority, and failure to abide by the substantive requirements of the FTC Act and other consumer protection laws can result in administrative or judicial penalties, including civil penalties, or injunctions affecting the manner in which Quell could be marketed in the future.

Manufacturing Facilities

Our facility, and the facilities utilized by our contract sub-assembly manufacturer, have been inspected by FDA in the past, and observations were noted. There were no findings that involved a significant violation of regulatory requirements. The responses to these observations have been accepted by the FDA and we believe that we and our contract manufacturers are in substantial compliance with the FDA QSR. We expect that our facility and our subcontract facilities will be inspected again as required by the FDA. If the FDA finds significant violations, we could be subject to fines, recalls, requirements to halt manufacturing, or other administrative or judicial sanctions.

Medical Device Single Audit Program (MDSAP)

The International Medical Device Regulators Forum (IMDRF) recognized that a global approach to auditing and monitoring the manufacturing of medical devices could improve their safety and oversight on an international scale. The IMDRF established a work group which developed specific documents to advance a Medical Device Single Audit Program (MDSAP).

The Medical Device Single Audit Program allowed MDSAP recognized Auditing Organizations to conduct a single regulatory audit of a medical device manufacturer to satisfy the relevant requirements of the regulatory authorities participating in the program.

MDSAP participating international partners include:

•MDSAP Members

▪Therapeutic Goods Administration of Australia

▪Brazil’s Agência Nacional de Vigilância Sanitária

▪Health Canada

▪Japan’s Ministry of Health, Labour and Welfare, and the Japanese Pharmaceuticals and Medical Devices Agency

▪U.S. Food and Drug Administration

12

•MDSAP Official Observers:

▪The World Health Organization (WHO) Prequalification of In Vitro Diagnostics (IVDs) Programme

▪United Kingdom’s Medicines and Healthcare products Regulatory Agency (MHRA)

▪European Union (EU)

•MDSAP Affiliate Members:

▪Republic of Korea's Ministry of Food and Drug Safety

▪Argentina’s National Administration of Drugs, Foods, and Medical Devices (ANMAT)

▪Federal Commission for Protection from Sanitary Risks (COFEPRIS) of Mexico

▪Ministry of Health of Israel

▪Singapore’s Health Sciences Authority (HSA)

▪TFDA – Taiwan Food and Drug Administration

Based on its evaluation of the MDSAP Final Pilot Report, the MDSAP Regulatory Authority Council (the international MDSAP governing body) determined that the MDSAP Pilot had satisfactorily demonstrated the viability of the Medical Device Single Audit Program.

In May 2023, we underwent a MDSAP audit by the registrar TÜV SÜD. There were no observations noted in the audit. There was a second TÜV SÜD audit under the direction of the European Union which resulted in two minor observations which were satisfactorily resolved. The FDA accepts MDSAP audit reports as a substitute for routine Agency inspections.

Human Capital Resources

As of December 31, 2023, we had 26 full time employees. Of these employees, six were in research and development, ten in sales and marketing, five in production/distribution, and five in general and administrative services. One employee holds both an M.D. and a Ph.D. Our employees are not represented by a labor union and are not subject to a collective bargaining agreement. We have never experienced a work stoppage and believe that we have good employee relations.

We recruit employees with the skills and training relevant to functional responsibilities. As a small, innovative company focused on profitable growth, we believe that our future success largely depends on our continued ability to attract and retain highly skilled employees. We assess the likelihood that a particular candidate will contribute to the Company’s overall goals, and beyond their specifically assigned tasks. Depending on the position, our recruitment reach can be national or local. We aim to provide market-based compensation and stretch incentives. We work to retain our employees for many years, as evidenced by the average of over nine years' tenure of our workforce. New employees are provided industry-relevant compliance training and are introduced to our Code of Business Conduct and Ethics, with which all employees are required to annually confirm compliance.

Available Information

Access to our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to these reports filed with or furnished to the Securities and Exchange Commission (SEC) may be obtained through the Investor Relations section of our website at www.neurometrix.com/investor as soon as reasonably practical after we electronically file or furnish these reports. We do not charge for access to and viewing these reports. Information on our Investor Relations page and on our website is not part of this Annual Report on Form 10-K or any of our other securities filings unless specifically incorporated herein by reference. In addition, the SEC maintains an Internet site that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC. Also, our filings with the SEC may be accessed through the SEC’s website at www.sec.gov. All statements made in any of our securities filings, including all forward-looking statements or information, are made as of the date of the document in which the statement is included, and we do not assume or undertake any obligation to update any of those statements or documents unless we are required to do so by law.

Corporate Information

NeuroMetrix was founded in June 1996 by our President and Chief Executive Officer, Shai N. Gozani, M.D., Ph.D. We were originally incorporated in Massachusetts in 1996 and were reincorporated in Delaware in 2001. Our offices and production facilities are located at 4-B Gill Street, Woburn, Massachusetts 01801. Our website is www.neurometrix.com.

13

ITEM 1A. Risk Factors

You should carefully consider the following risks and all other information contained in this Annual Report on Form 10-K and our other public filings before making any investment decisions with respect to our securities. If any of the following risks occurs, our business, prospects, reputation, results of operations, or financial condition could be harmed. In that case, the trading price of our securities could decline, and our stockholders could lose all or part of their investment. This Annual Report also contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements as a result of specific factors, including the risks described below and elsewhere in this Annual Report on Form 10-K.

Summary of Risk Factors

Our business is subject to numerous risks and uncertainties, including those highlighted in this section below, that represent challenges that we face in connection with the successful implementation of our strategy. The occurrence of one or more of the events or circumstances described in more detail in the risk factors below, alone or in combination with other events or circumstances, may have an adverse effect on our business, prospects, reputation, results of operations, or financial condition. Such risks include, but are not limited to:

•We have incurred significant operating losses since inception and cannot assure you that we will achieve profitability.

•Our future capital needs are uncertain. Our operations could be curtailed if we are unable to obtain the required additional funding when needed. The terms of any financings may not be advantageous to us.

•We hold an investment portfolio of securities that could experience losses.

•We are focused on growing sales of Quell, our wearable device for chronic pain, and DPNCheck, our test for peripheral neuropathy. We cannot assure you that we will be successful with these products or future product candidates or product enhancements in our development pipeline.

•Our current and future revenue is dependent upon commercial acceptance of our products in the marketplace. If our products are not accepted by prescribers and customers, our operations will be materially and adversely affected.

•If health care providers are unable to obtain sufficient reimbursement or other financial incentives from third-party health care payers related to the use of our products, other than Quell, their adoption and our future product sales will be materially adversely affected.

•The clinical study process is lengthy and expensive with uncertain outcomes. Results of earlier studies may not be predictive of future clinical study results, or the safety profile for such products or products under development.

•We rely on third parties to conduct clinical trials and perform data collection and analysis, which may result in costs and delays that prevent us from successfully commercializing our product candidates.

•We depend on several single source manufacturers to produce components of our products. Any material adverse changes in our relationships with these manufacturers, or material supply chain delays, could prevent us from delivering products to our customers in a timely manner and may adversely impact our future revenues or costs.

•The success of our business depends upon our ability to advance our pipeline products to commercialization.

•Our ability to achieve profitability depends in part on maintaining or increasing our gross margins on product sales which we may not be able to achieve.

•If we are unable to recruit, hire and retain skilled and experienced personnel, our ability to manage and expand our business will be harmed, which would impair our future revenues and profitability.

•Failure to develop or enter into relationships to sell products other than our existing products or enhance our existing products could have an adverse effect on our business prospects.

•If we are unable to develop new products or enhance existing products, we may be unable to attract or retain customers.

•We currently compete, and may in the future need to compete, against other medical device and consumer companies with greater resources, more established distribution channels and other competitive advantages, and the success of these competitors may harm our ability to generate revenues.

14

•Cybersecurity incidents, security breaches and other disruptions could compromise our information, hinder our ability to perform essential activities and expose us to financial claims and liabilities, which could cause our business and reputation to suffer.

•If future clinical studies or other articles are published, or physician associations or other organizations announce positions that are unfavorable to our products, our sales efforts and revenues may be negatively affected.

•If we expand in foreign markets, we will be affected by new business risks that may adversely impact our financial condition or results of operations.

•We are subject to extensive regulation by the FDA and other federal and state regulators which could restrict the sales and marketing of Quell, DPNCheck and ADVANCE, as well as other products for which we may seek FDA clearance or approval, and could cause us to incur significant costs.

•If we or our manufacturers fail to comply with the FDA’s quality system regulation, the manufacturing and distribution of our products could be interrupted, and our product sales and operating results could suffer.

•We are subject to Federal Trade Commission regulatory oversight. Exercise of this regulatory oversight could lead to an outcome which would constrain our marketing of Quell, cause us to incur significant costs and penalties, and adversely affect our financial results.

•Our products may be subject to recalls, even after receiving FDA clearance or approval, which would harm our reputation, business and financial results.

•We are subject to federal and state laws prohibiting “kickbacks” and false or fraudulent claims, which, if violated, could subject us to substantial penalties. Additionally, any challenge to or investigation into our practices under these laws could cause adverse publicity and be costly to respond to, and thus could harm our business.

•If we are found to have violated laws protecting the confidentiality of patient health information, we could be subject to civil or criminal penalties, which could increase our liabilities, damage our reputation and harm our business.

•The use of our products could result in product liability claims that could be expensive, damage our reputation and harm our business.

•Our products are complex in design, and defects may not be discovered prior to shipment to customers, which could result in warranty obligations or product liability or other claims, reducing our revenues and increasing our costs and liabilities.

•The patent rights we rely upon to protect the intellectual property underlying our products may not be adequate, which could enable third parties to use our technology and would harm our ability to compete in the market.

•Other rights and measures we have taken to protect our intellectual property may not be adequate, which would harm our ability to compete in the market.

•Claims that our products infringe on the proprietary rights of others could adversely affect our ability to sell our products and increase our costs.

•Future sales of securities may cause our stock price to decline as a result of the dilution which will occur to existing stockholders.

•The trading price of our common stock has been volatile and is likely to be volatile in the future.

•We have, in the past, failed to satisfy certain continued listing requirements on The Nasdaq Stock Market LLC (Nasdaq) and could fail to satisfy those requirements again in the future which could affect the market price of our common stock and liquidity and reduce our ability to raise capital.

Risks Related to Our Business

We have incurred significant operating losses since inception and cannot assure you that we will achieve profitability.

We have incurred recurring losses from operations and negative cash flows from operating activities. At December 31, 2023, we had an accumulated deficit of $210.1 million. The extent of our future operating income or losses is highly uncertain, and we cannot assure you that we will be able to achieve or maintain profitability.

Our future capital needs are uncertain. Our operations could be curtailed if we are unable to obtain the required additional funding when needed. The terms of any financing may not be advantageous to us.

15

We held cash, cash equivalents and investment grade securities of $18.0 million as of December 31, 2023. We believe that these resources, and the cash to be generated from future product sales will be sufficient to meet our projected operating requirements for at least the next twelve months from the day of issuance of the financial statements. However, we may still need to raise additional funds to support our future operating and capital needs.

We expect to incur further losses as we grow sales of our products. We continue to face significant challenges and uncertainties and, as a result, our available capital resources may be consumed more rapidly than currently expected due to (a) decreases in sales of our products and the uncertainty of future revenues from new products; (b) the effect of supply chain issues on our ability to obtain parts and materials from our suppliers; (c) changes we may make to the business that affect ongoing operating expenses; (d) changes we may make in our business strategy; (e) regulatory developments and inquiries affecting our existing products; (f) changes in our research and development spending plans; and (g) other items affecting our forecasted level of expenditures and use of cash resources. We may attempt to obtain additional funding through public or private financing, collaborative arrangements with strategic partners, asset divestitures, or through additional credit lines or other debt financing sources to increase the funds available to fund operations. However, we may not be able to secure such financing in a timely manner or on favorable terms, if at all. Furthermore, if we issue equity or debt securities to raise additional funds, our existing stockholders may experience dilution, and the new equity or debt securities may have rights, preferences and privileges senior to those of our existing stockholders. If we raise additional funds through collaboration, licensing or other similar arrangements, it may be necessary to relinquish valuable rights to our potential products or proprietary technologies, or to grant licenses on terms that are not favorable to us. Without additional funds, we may be forced to delay, scale back or eliminate some of our sales and marketing efforts, research and development activities, or other operations and potentially delay product development in an effort to provide sufficient funds to continue our operations. If any of these events occurs, our ability to achieve our development and commercialization goals would be adversely affected.

We hold an investment portfolio of securities that could experience losses.

We invest our cash resources not required for near-term operations in a portfolio of debt securities. These securities are evaluated by independent rating agencies and meet the criteria of “investment grade” securities at the time of purchase. Changes in domestic or world-wide economic conditions, or in the operations of the issuing entities could result in a rating downgrade of the securities or an inability of the issuer to meet its obligation to the Company upon maturity. In this event, the Company would be exposed to loss in value of the security. If the change in economic conditions was so severe as to affect the overall securities market and therefore a significant part of the Company’s portfolio, the loss in value could jeopardize the Company’s ability to adequately fund its operations, its strategic initiatives and achieve its development and commercialization goals.

We are focused on growing sales of Quell, our wearable device for chronic pain, and DPNCheck, our test for peripheral neuropathy, and. We cannot assure you that we will be successful with these products or future product candidates or product enhancements in our development pipeline.

Quell was launched in June 2015, and is a wearable neuromodulation device for the symptomatic relief and management of chronic pain indications. We are leveraging our core Quell technology into a portfolio of Rx wearable neurotherapeutics. Quell - Fibromyalgia, the first product in this emerging portfolio, was launched in late 2022 as an aid for reducing the symptoms of fibromyalgia in adults with high pain sensitivity. We have recently filed with FDA a 510(k) marketing application for Quell – CIPN.

DPNCheck was launched in 2011 and is a nerve conduction test for peripheral neuropathies such as diabetic peripheral neuropathy. Our sales strategy for DPNCheck has focused on the U.S. MA sector through our own commercial team, and physician offices and hospitals in Japan and China through distribution partners.

The MA market experienced substantial change during 2023 when CMS issued new rules on the MA RADV program that is used to recover improper risk adjustment payments made to MA plans and also issued its 2024 Medicare Advantage Advance Notice, which confirmed substantial changes to the HCC risk adjustment model limiting HCC codes for many types of peripheral neuropathies. The impact of these factors on 2023 DPNCheck revenue was materially adverse. While we continue to support our customers and work to acquire new accounts, we do not expect a near-term recovery from the decline in DPNCheck revenue.

16

Our future prospects are closely tied to our success with Quell and DPNCheck, which, in turn, depend upon market acceptance and growth in future revenues and margins. We cannot assure you that our commercialization strategy will be successful. If our strategy is not successful, it could materially affect our revenues and results of operations.

Our future success could be adversely affected by a number of factors, including:

•inability to increase adoption of DPNCheck within the MA market and outside the United States;

•regulatory inquiries or issues affecting our products;

•unfavorable changes to current Medicare, Medicare Advantage and commercial payer payment policies;

•changes to payor policies under the Patient Protection and Affordable Care Act;

•inability to efficiently create market demand for prescription wearable neurotherapeutics based on Quell technology at profitable pricing and with efficient marketing;

•manufacturing issues with Quell or our other products;

•unfavorable experiences by patients and physicians using DPNCheck, Quell and our other products; and,

•physicians’ or patients' reluctance to alter their existing practices and adopt the use of our devices.

If we are unable to expand exposure and market demand for DPNCheck and Quell, our ability to increase our revenues will be limited and our business prospects will be adversely affected.

Our current and future revenue is dependent upon commercial acceptance of our products in the marketplace. If our products are not accepted by prescribers and customers, our operations will be materially and adversely affected.

We will continue to incur operating losses until such time as sales of Quell, DPNCheck and other products or product candidates reach a mature level and we are able to generate sufficient revenue from their sale to meet our operating expenses. There can be no assurance that customers will adopt our technology and products, or that prospective customers will agree to pay for our products. In the event that we are not able to significantly increase the number of customers that purchase our products, or if we are unable to charge the necessary prices, our financial condition and results of operations will be materially and adversely affected.

If health care providers are unable to obtain sufficient reimbursement or other financial incentives from third-party health care payers related to the use of our products other than Quell, their adoption and our future product sales will be materially adversely affected.

Widespread adoption of our diagnostic products by the medical community is unlikely to occur without a financial incentive from third-party payers for the use of these products. If health care providers are unable to obtain adequate reimbursement for procedures performed using these products, and if managed care organizations do not receive improved capitated payments due to more accurate patient risk assessment using our products, we may be unable to sell our products at levels that are sufficient to allow us to achieve and maintain profitability, and our business would suffer significantly. Additionally, even if these products and procedures are adequately reimbursed by third-party payers today, adverse changes in payers future policies toward payment would harm our ability to market and sell our products. Third-party payers include governmental programs such as Medicare and Medicaid, private health insurers, workers’ compensation programs and other organizations.

Future regulatory action by CMS or other governmental agencies or negative clinical results may diminish reimbursement payments to physicians for performing procedures using our products. Medicaid reimbursement differs from state to state, and some state Medicaid programs may not cover the procedures performed with our products or pay physicians an adequate amount for performing those procedures, if at all. Additionally, some private payers do not follow the Medicare guidelines and may reimburse for only a portion of these procedures or not at all. We are unable to predict what changes will be made in the reimbursement methods used by private or governmental third-party payers.

The clinical study process is lengthy and expensive with uncertain outcomes. Results of earlier studies may not be predictive of future clinical study results, or the safety profile for such products or products under development.

17

Clinical testing is difficult to design and implement, can take many years, can be expensive, and carries uncertain outcomes. The results of clinical studies of our products conducted to date and ongoing or future studies of our current, planned, or future products and product candidates may not be predictive of the results of later clinical studies, and interim results of a clinical study do not necessarily predict final results. Our interpretation of data and results from our clinical studies do not ensure that we will achieve similar results in future clinical studies. In addition, clinical data is often susceptible to various interpretations and analyses, and many companies that have believed their products performed satisfactorily in clinical studies have nonetheless failed to replicate results in later clinical studies. Products in later stages of clinical studies may fail to show the desired safety and efficacy despite having progressed through nonclinical studies. Failure can occur at any stage of clinical testing. Our clinical studies may produce negative or inconclusive results, and we may decide, or regulators may require us, to conduct additional clinical and non-clinical testing in addition to those we have planned.

We rely on third parties to conduct our clinical trials and perform data collection and analysis, which may result in costs and delays that prevent us from successfully commercializing our product candidates.

We rely on contract research organizations, medical institutions, clinical investigators, and contract laboratories to perform data collection and analysis and other aspects of our clinical trials. Our clinical trials may be delayed, suspended, or terminated if: the quality or accuracy of the data obtained by the third parties on whom we rely is compromised due to their failure to adhere to our clinical protocols or regulatory requirements or if for other reasons, these third parties do not successfully carry out their contractual duties or fail to meet regulatory obligations or expected deadlines, or these third parties need to be replaced.

If the third parties on whom we rely fail to perform, our development costs may increase, and our ability to obtain regulatory approval and commercialize our product candidates may be delayed or prevented altogether. We currently support medical institutions who are conducting clinical trials related to our products. While we believe that there are alternative approaches to these medical institutions, in the event that we seek such alternative sources we may not be able to enter into replacement arrangements without delays or incurring additional expenses.

We depend on several single source manufacturers to produce components of our products. Any material adverse changes in our relationships with these manufacturers, or material supply chain delays, could prevent us from delivering products to our customers in a timely manner and may adversely impact our future revenues or costs.

We rely on third-party manufacturers to manufacture components of our Quell, DPNCheck and ADVANCE systems. In the event that our manufacturers cease to manufacture sufficient quantities of our products or components in a timely manner and on terms acceptable to us, we would be forced to locate alternate manufacturers. Additionally, if our manufacturers experience a failure in their production process, are unable to obtain sufficient quantities of the components necessary to manufacture our products, experience extraordinary price increases on parts essential to our products or otherwise fail to meet our quality requirements, we may be forced to delay the manufacture and sale of our products or to locate an alternative manufacturer. We may be unable to locate suitable alternative manufacturers for our products or components for which the manufacturing process is relatively specialized, on terms acceptable to us, or at all. While we have long-standing relationships with our primary suppliers for device components, electrodes and biosensors, these suppliers are, in turn, dependent on other manufacturers of electronic parts and components, and are therefore subject to supply and demand risks of the electronic parts and components marketplace, and the potential for parts obsolescence. As a result, there is a risk that certain parts and components could be in short supply at a time when required by us or they could be discontinued and no longer available to us.

We have experienced, from time to time, inventory shortages on our products and essential parts. If any materially adverse changes in our relationships with manufacturers or parts suppliers occur, our ability to supply our customers will be severely limited until we are able to engage an alternate manufacturer or parts supplier or, if applicable, resolve any quality issues with our existing manufacturer. This situation could prevent us from delivering products to our customers in a timely manner, lead to decreased sales or increased costs, or harm our reputation with our customers.

If our manufacturers are unable to supply us with an adequate supply of product components, we could lose customers, our potential future growth could be limited and our business could be harmed.

In order for us to successfully expand our business, our contract manufacturers must be able to provide us with substantial quantities of components of our products in compliance with regulatory requirements, in accordance with agreed upon

18

specifications, at acceptable cost and on a timely basis. Our potential future growth could strain the ability of our manufacturers to deliver products and obtain materials and components in sufficient quantities. Manufacturers often experience difficulties in scaling up production, including problems with production yields and quality control and assurance. If we are unable to obtain sufficient quantities of high-quality products to meet customer demand on a timely basis, we could lose customers, our growth may be limited and our business could be harmed.

The success of our business depends upon our ability to advance our pipeline products to commercialization.

We commenced commercialization of Quell in June 2015 and we completed a DPNCheck product upgrade during 2022. We have additional product candidates and enhancements of our existing products in our R&D pipeline. We expect that advancing our pipeline products will require significant time and resources. We may not be successful in our commercialization efforts for any of the product candidates or product enhancements currently in our pipeline and we may not be successful in developing, acquiring, or in licensing additional product candidates, to the extent we decide to do so. If we are not successful in advancing new products through our development pipeline, the regulatory process and commercial launch, our business, financial condition, and results of operations will be adversely affected.

Our ability to achieve profitability depends in part on maintaining or increasing our gross margins on product sales which we may not be able to achieve.

A number of factors may adversely impact our gross margins on product sales and services, including:

•shortages of electronic components resulting in higher prices or an inability to supply key parts;

•low production volume which will result in high levels of overhead cost per unit of production;

•increased material or labor costs;

•increased service or warranty costs or the failure to reduce service or warranty costs;

•increased price competition;

•variation in the margins across products in a particular period; and

•how well we execute on our strategic and operating plans.

If we are unable to maintain or increase our gross margins on product sales, our results of operations could be adversely impacted, we may not achieve profitability and our stock price could decline.

If we lose any of our officers or key employees, our management and technical expertise could be weakened significantly.

Our success largely depends on the skills, experience, and efforts of our executive officers, Shai N. Gozani, M.D., Ph.D., our founder, Chairman, President and Chief Executive Officer, and Thomas T. Higgins, our Senior Vice President and Chief Financial Officer. We do not maintain key person life insurance policies covering any of our employees. The loss of either of our executive officers could weaken our management and technical expertise significantly and harm our business.

If we are unable to recruit, hire and retain skilled and experienced personnel, our ability to manage and expand our business will be harmed, which would impair our future revenues and profitability.

We are a small company with 26 employees as of December 31, 2023, and our ability to retain our skilled labor force and our success in attracting and hiring new skilled employees will be a critical factor in determining our future performance. We may not be able to meet our future hiring needs or retain existing personnel, particularly given the challenges faced by our business. We will face challenges and risks in hiring, training, managing and retaining engineering and sales and marketing employees. Failure to attract and retain personnel, particularly technical and sales and marketing personnel would materially harm our ability to compete effectively and grow our business.

Failure to develop or enter into relationships to sell products other than our existing products or enhance our existing products could have an adverse effect on our business prospects.

19

Our future business and financial success will depend, in part, on our ability to effectively market our products, including Quell and DPNCheck, and to enhance these products in response to customer demand and feedback. Developing new products and upgrades to existing and future products imposes burdens on our research and development department and our management. This process is costly, and we cannot assure you that we will be able to successfully develop new products or enhance our current products. We also may not be able to enter into relationships with other companies to sell additional products. In addition, as we develop the market for our products, future competitors may develop desirable product features earlier than we do which could make our competitors’ products less expensive or more effective than our products and could render our products obsolete or unmarketable. If our product development efforts are unsuccessful, we will have incurred significant costs without recognizing the expected benefits and our business prospects may suffer.

If we are unable to develop new products or enhance existing products, we may be unable to attract or retain customers.

Our success depends on the successful development, regulatory clearance or approval (if required), introduction and commercialization of new generations of products, treatment systems, and enhancements to and/or simplification of existing products. Quell and DPNCheck must keep pace with, among other things, the products of our competitors. We are making significant investments in long-term growth initiatives. Such initiatives require significant capital commitments, involvement of senior management and other investments on our part, which we may be unable to recover. Our timeline for the development of new products or enhancements may not be achieved and price and profitability targets may not prove feasible. Commercialization of new products may prove challenging, and we may be required to invest more time and money than expected to successfully introduce them. Once introduced, new products may adversely impact orders and sales of our existing products, or make them less desirable or even obsolete. Compliance with regulations, competitive alternatives, and shifting market preferences may also impact the successful implementation of new products or enhancements.

Our ability to successfully develop and introduce new products and product enhancements, and the revenues and costs associated with these efforts, may be affected by our ability to:

•properly identify customer needs;

•prove feasibility of new products in a timely manner;

•educate physicians about the use of new products and procedures;

•comply with internal quality assurance systems and processes timely and efficiently;

•comply with regulatory requirements relating to our products, and limit the timing and cost of obtaining required regulatory approvals or clearances;

•accurately predict and control costs associated with inventory overruns caused by phase-in of new products and phase-out of old products;

•price new products competitively;

•manufacture and deliver our products in sufficient volumes on time, and accurately predict and control costs associated with manufacture of the products; and

•meet our product development plan and launch timelines.

Even if customers accept new products or product enhancements, the revenues from these products may not be sufficient to offset the significant costs associated with making them available to customers. Failure to successfully develop, obtain regulatory approval or clearance for, manufacture or introduce new products or to complete these processes in a timely and efficient manner could result in delays that could affect our ability to attract and retain customers, or could cause customers to delay or cancel orders, causing our backlog, revenues and operating results to suffer.

We currently compete, and may in the future need to compete, against other medical device and consumer companies with greater resources, more established distribution channels and other competitive advantages, and the success of these competitors may harm our ability to generate revenues.

We currently do, and in the future may need to, compete directly and indirectly with a number of other companies that may have competitive advantages over us. Our diagnostic devices for nerve testing compete with companies that sell traditional

20

nerve conduction study and electromyography equipment including Cadwell Laboratories, Inc. and Natus Medical Incorporated. These companies enjoy significant competitive advantages, including:

•greater resources for product development, sales and marketing;

•more established distribution networks;

•greater name recognition;

•more established relationships with health care professionals, customers and third-party payers; and

•additional lines of products and the ability to offer rebates or bundle products to offer discounts or incentives.

As we develop the market for wearable technology for chronic pain, we will be faced with competition from other companies that decide and are able to enter the market as well as competition from other forms of treatment for chronic pain. Some or all of our future competitors in the diagnostic nerve testing market and the chronic pain market may enjoy competitive advantages such as those described above. If we are unable to compete effectively against existing and future competitors, our sales will decline and our business will be harmed.

Cybersecurity incidents, security breaches and other disruptions could compromise our information, hinder our ability to perform essential activities, and expose us to financial claims and liabilities, which could cause our business and reputation to suffer.

In the ordinary course of our business, we collect and store sensitive data in our data centers, on our networks, including intellectual property, our proprietary business information, and that of our customers, suppliers and business partners, and personally identifiable information of our employees. The secure processing, maintenance and transmission of this information is critical to our operations. Despite our security measures, our information technology and infrastructure may be vulnerable to attacks by hackers or breached due to employee error, malfeasance or other disruptions. Similar risks exist with respect to our business partners and third-party providers, including suppliers, software and cloud-based service providers, that we rely upon for aspects of our information technology support services and certain administrative functions. Any such incident or breach could compromise our networks and the information stored there could be accessed, publicly disclosed, lost or stolen. Any such access, disclosure or other loss of information could result in legal claims or proceedings, disrupt our operations, damage our reputation, and cause a loss of confidence in our products and services, which could have a material adverse effect on our business, financial condition, results of operations or cash flows.

If future clinical studies or other articles are published, or physician associations or other organizations announce positions that are unfavorable to our products, our sales efforts and revenues may be negatively affected.

Future clinical studies or other articles regarding our existing products or any competing products may be published that either support a claim, or are perceived to support a claim, that a competitor’s product is more accurate or effective than our products or that our products are not as accurate or effective as we claim or previous clinical studies have concluded. Additionally, physician associations or other organizations that may be viewed as authoritative or have an economic interest in nerve conduction studies and in related electrodiagnostic procedures or other procedures that may be performed using our products or in neurostimulation therapies using our devices could endorse products or methods that compete with our products or otherwise announce positions that are unfavorable to our products. Any of these events may negatively affect our sales efforts and result in decreased revenues.

If we expand in foreign markets, we will be affected by new business risks that may adversely impact our financial condition or results of operations.

Foreign markets represented approximately 20% and 14% of our revenues in 2023 and 2022, respectively. We are evaluating future expansion, particularly in Asia. Any such expansion will subject us to the possibility of new business risks, including:

•failure to fulfill foreign regulatory requirements, if applicable, to market our products;

•availability of, and changes in, reimbursement within prevailing foreign health care payment systems;

•adapting to the differing business practices and laws in foreign countries;

21

•difficulties in managing foreign relationships and operations, including any relationships that we establish with foreign distributors or sales or marketing agents;

•limited protection for intellectual property rights in some countries;

•difficulty in collecting accounts receivable and longer collection periods;

•costs of enforcing contractual obligations in foreign jurisdictions;

•recessions in economies outside of the United States;

•political instability and unexpected changes in diplomatic and trade relationships;

•currency exchange rate fluctuations; and

•potentially adverse tax consequences.

If we are successful in introducing our products into foreign markets, we will be affected by these additional business risks, which may adversely impact our financial condition or results of operations. In addition, expansion into foreign markets imposes additional burdens on our executive and administrative personnel, research and sales departments, and general managerial resources. Any efforts to introduce our products into foreign markets may not be successful, in which case we may have expended significant resources without realizing the expected benefit.

Risks Related to Government Regulation and Other Legal Compliance Matters

We are subject to extensive regulation by the FDA and other federal and state regulators which could restrict the sales and marketing of Quell, DPNCheck and ADVANCE, as well as other products for which we may seek FDA clearance or approval, and could cause us to incur significant costs.

We sell medical devices that are subject to extensive regulation in the United States by the FDA with regard to manufacturing, labeling, sale, promotion, distribution, shipping and ongoing monitoring and follow-up. Before a new medical device, or a new use of or claim for an existing product, can be marketed in the United States, it must first be cleared or approved by the FDA. Medical devices may be marketed only for the indications for which they are approved or cleared. The regulatory review process can be expensive and lengthy. The FDA’s process for granting 510(k) clearance typically takes approximately three to six months, and for De Novo clearance approximately five months to one year. However, in both cases it can be significantly longer. The process for obtaining a PMA is much more costly and onerous. By law, the time period designated for the FDA’s review of a PMA is 180 days; however, this time is often extended and it is not uncommon for the PMA review process to take three years or longer from the time the application is filed with the FDA.

The FDA may remove our devices from the market or enjoin them from commercial distribution if safety or effectiveness problems develop. Further, we may not be able to obtain additional 510(k) clearances, De Novo clearances or pre-market approvals for new products or for modifications to, or additional indications for, our existing products in a timely fashion, or at all. Delays in obtaining future clearances or approvals would adversely affect our ability to introduce new or enhanced products in a timely manner, which in turn would harm our revenue and future profitability. We have made modifications to our devices in the past and may make additional modifications in the future that we believe do not or will not require additional clearances or approvals. If the FDA disagrees, and requires new clearances or approvals for the modifications, we may be required to recall and to stop marketing the modified devices. If any of these events occurs or if the FDA takes other enforcement actions, we may not be able to provide our customers with the products they require on a timely basis, our reputation could be harmed, and we could lose customers and suffer reduced revenues and increased costs.

We also are subject to numerous post-marketing regulatory requirements, including the FDA’s (i) quality system regulations, which relate to the design, manufacture, packaging, labeling, storage, installation and servicing of our products; (ii) labeling regulations, medical device reporting regulations; and (iii) correction and removal reporting regulations. Third-party pharmacies, including online pharmacies, and other distributors of our products may also be subject to federal, state and local licensing, accreditation and other regulatory requirements. Our failure or the failure by any manufacturer, pharmacy or distributor of our products to comply with applicable regulatory requirements could result in enforcement action by the FDA or other regulators or it could result in delays in the distribution of our products. FDA enforcement actions relating to post-marketing regulatory requirements or other issues may include any of the following:

•warning letters, untitled letters, fines, injunctions, product seizures, consent decrees and civil penalties;

•requiring repair, replacement, refunds, customer notifications or recall of our products;

•imposing operating restrictions, suspension or shutdown of production;

22

•refusing our requests for 510(k) clearance or PMA approval of new products, new intended uses, or modifications to existing products;

•requesting voluntary rescission of 510(k) clearances or withdrawing PMA approvals that have already been granted; and

•criminal prosecution.

If any of these events were to occur, they could harm our reputation, our ability to generate revenues and our profitability.

Also, from time to time, legislation is introduced into Congress that could significantly change the statutory provisions governing the approval, manufacturing and marketing of medical devices. FDA regulations and guidance are often revised or reinterpreted by the agency in ways that may significantly affect our business and our products. It is impossible to predict whether legislative changes will be enacted, or FDA regulations, guidance or interpretations changed, and what the impact of such changes, if any, may be. The FDA has publicly stated that it is reevaluating its longstanding 510(k) review program. It is not clear when, or if, the program will be modified and what effect the modified review process will have on our ability to bring our product candidates to market.

If we or our manufacturers fail to comply with the FDA’s quality system regulation, the manufacturing and distribution of our products could be interrupted, and our product sales and operating results could suffer.

We and our contract manufacturers are required to comply with the FDA’s QSR which is a complex regulation that governs the procedures and documentation of the design, testing, production, control, quality assurance, labeling, packaging, sterilization, storage and shipping of our devices. The FDA enforces the QSR through periodic inspections. We cannot assure you that our facilities or the facilities of the manufacturers of our products would pass any future inspection. If our facilities or any of the facilities of the manufacturers of our products fail an inspection, the manufacturing or distribution of our products could be interrupted and our operations disrupted. Failure to take adequate and timely corrective action in response to an adverse inspection could result in a suspension or shutdown of our packaging and labeling operations and the operations of the manufacturers of our products or a recall of our products, or other administrative or judicial sanctions. If any of these events occurs, we may not be able to provide our customers with the quantity of products they require on a timely basis, our reputation could be harmed, and we could lose customers and suffer reduced revenues and increased costs.

We are subject to Federal Trade Commission regulatory oversight. Exercise of this regulatory oversight could lead to an outcome which would constrain our marketing of Quell, cause us to incur significant costs and penalties, and adversely affect our financial results.

Under the FTC Act, the FTC is empowered, among other things, to (a) prevent unfair methods of competition and unfair or deceptive acts or practices in or affecting commerce; (b) seek monetary redress and other relief for conduct injurious to consumers; and (c) gather and compile information and conduct investigations relating to the organization, business, practices, and management of entities engaged in commerce. The FTC has very broad enforcement authority, and failure to abide by the substantive requirements of the FTC Act and other consumer protection laws can result in administrative or judicial penalties, including civil penalties, or injunctions affecting the manner in which we would be able to market Quell in the future.

Our products may be subject to recalls, even after receiving FDA clearance or approval, which would harm our reputation, business and financial results.

We are subject to the medical device reporting regulations, which require us to report to the FDA if our products may have caused or contributed to a death or serious injury, or have malfunctioned in a way that would likely cause or contribute to a death or serious injury if the malfunction were to occur. We are also subject to the correction and removal reporting regulations, which require us to report to the FDA any field corrections and device recalls or removals that we undertake to reduce a risk to health posed by the device or to remedy a violation of the Federal Food, Drug and Cosmetic Act (FDCA) caused by the device which may present a risk to health. In addition, the FDA and similar governmental agencies in other countries have the authority to require the recall of our products if there is a reasonable probability that the products would cause serious adverse health consequences or death. A government-mandated or voluntary recall by us could occur as a result of manufacturing defects, labeling deficiencies, packaging defects or other failures to comply with applicable regulations. Any recall would divert management attention and financial resources and harm our reputation with customers and could have a material adverse effect on our financial condition and results of operations.

23

We are subject to federal and state laws prohibiting “kickbacks” and false or fraudulent claims, which, if violated, could subject us to substantial penalties. Additionally, any challenge to or investigation into our practices under these laws could cause adverse publicity and be costly to respond to, and thus could harm our business.

A federal law commonly known as the federal anti-kickback law, and several similar state laws, prohibit the payment of any remuneration that is intended to induce physicians or others either to refer patients or to acquire or arrange for or recommend the acquisition of health care products or services. These laws constrain a medical device company’s sales, marketing and other promotional activities by limiting the kinds of business relationships and financial arrangements, including sales programs we may have with hospitals, pharmacies (including online pharmacies), physicians or other potential purchasers of medical devices. Other federal and state laws generally prohibit individuals or entities from knowingly presenting, or causing to be presented, claims for payment to Medicare, Medicaid or other third-party payers that are false or fraudulent, or for items or services that were not provided as claimed. We rely on third-party health care organizations, pharmacies (including online pharmacies) and distributors to fulfill orders of our products. In addition, from time to time, we may provide coding and billing information as product support to purchasers of our products. Our relationships with health care organizations, pharmacies and other third parties could be scrutinized under federal and state health care laws such as the anti-kickback laws. Anti-kickback and false claims laws prescribe civil and criminal penalties for noncompliance, which can be quite substantial including exclusion from participation in federal health care programs. A number of states have enacted laws that require pharmaceutical and medical device companies to monitor and report payments, gifts and other remuneration made to physicians and other health care professionals and health care organizations. Some state statutes, such as the one in Massachusetts, impose an outright ban on gifts to physicians. These laws are often referred to as “gift ban” or “aggregate spend” laws and carry substantial fines if they are violated. Similar legislation, known as the Physician Payments Sunshine Act, was enacted by Congress in 2014. In the event that we are found to have violated these laws or determine to settle a claim that we have done so, our business may be materially adversely affected as a result of any payments required to be made, restrictions on our future operations or actions required to be taken, damage to our business reputation or adverse publicity in connection with such a finding or settlement or other adverse effects relating thereto. Additionally, even an unsuccessful challenge or investigation into our practices could cause adverse publicity, and be costly to respond to, and thus could harm our business and results of operations.

If we are found to have violated laws protecting the confidentiality of patient health information, we could be subject to civil or criminal penalties, which could increase our liabilities, damage our reputation and harm our business.

There are a number of federal and state laws protecting the confidentiality of individually identifiable patient health information, including patient records, and restricting the use and disclosure of that protected information. In particular, the U.S. Department of Health and Human Services promulgated patient privacy rules under the Health Insurance Portability and Accountability Act of 1996. These privacy rules protect medical records and other personal health information by limiting their use and disclosure, giving individuals the right to access, amend and seek accounting of their own health information and limiting most use and disclosures of health information to the minimum amount reasonably necessary to accomplish the intended purpose. Any failure or perceived failure by us or any third-party distributors, pharmacies, service providers, contractors or consultants to comply with privacy, confidentiality, data security or similar obligations, or any data security incidents or other security breaches that result in the accidental, unlawful or unauthorized access to, use of, release of, or transfer of sensitive information, may result in negative publicity, harm to our reputation, governmental investigations, enforcement actions, regulatory fines, litigation or public statements against us, could cause third parties to lose trust in us or could result in claims by third parties, including class action lawsuits, any of which could have a material adverse effect on our reputation, business, financial condition or results of operations.

The use of our products could result in product liability claims that could be expensive, damage our reputation and harm our business.

Our business exposes us to an inherent risk of potential product liability claims related to the manufacturing, marketing and sale of medical devices. The medical device industry historically has been litigious, and we face financial exposure to product liability claims if the use of our products were to cause or contribute to injury or death. Our products may be susceptible to claims of injury because their use involves the electric stimulation of a patient’s nerves. Although we maintain product liability insurance for our products and other commercial insurance, the coverage limits of these policies may not be adequate to cover future claims. We may be unable to maintain sufficient product liability or other commercial insurance on acceptable terms or at reasonable costs, and this insurance may not provide us with adequate coverage against potential liabilities. A successful claim brought against us in excess of, or outside of, our insurance coverage could have a material adverse effect on our financial condition and results of operations. A product liability claim, regardless of its merit or eventual outcome, could result in

24

substantial costs to us, a substantial diversion of management attention and adverse publicity. A product liability claim could also harm our reputation and result in a decline in revenues and an increase in expenses.

Our products are complex in design, and defects may not be discovered prior to shipment to customers, which could result in warranty obligations or product liability or other claims, reducing our revenues and increasing our costs and liabilities.

We depend upon third parties for the manufacture of our products or components. Our products, particularly our electrodes, require a significant degree of technical expertise to produce. If these manufacturers fail to produce our products to specification, or if the manufacturers use defective materials or workmanship in the manufacturing process, the reliability and performance of our products will be compromised.

If our products contain defects that cannot be repaired quickly, easily and inexpensively, we may experience:

•loss of customer orders and delay in order fulfillment;

•damage to our brand reputation;

•increased cost of our warranty program due to product repair or replacement;

•inability to attract new customers;

•diversion of resources from our manufacturing and research and development departments into our service department; and

•legal action.

The occurrence of any one or more of the foregoing could harm our reputation and materially reduce our revenues and increase our costs and liabilities.

Risks Related to Our Intellectual Property

The patent rights we rely upon to protect the intellectual property underlying our products may not be adequate, which could enable third parties to use our technology and would harm our ability to compete in the market.

Our success will depend in part on our ability to develop or acquire commercially valuable patent rights and to protect these rights adequately. The risks and uncertainties that we face with respect to our patents and other related rights include the following:

•the pending patent applications we have filed or to which we have exclusive rights may not result in issued patents or may take longer than we expect to result in issued patents;

•the claims of any patents that are issued may not provide meaningful protection;

•we may not be able to develop additional proprietary technologies that are patentable;

•other parties may challenge patents, patent claims or patent applications licensed or issued to us; and

•other companies may design around technologies we have patented, licensed or developed.

Our issued and filed patents for our wearable therapeutic products are recent. With regard to our legacy neurodiagnostic products, our issued design patents began to expire in 2015, and our issued utility patents began to expire in 2017. In particular, seven of our issued U.S. utility patents covering various aspects of the legacy neurodiagnostic business expired on the same day in 2017. Although the patent protection for material aspects of these products covered by the claims of the patents were lost at that time, we have additional patents and patent applications directed to other novel inventions that have patent terms extending into 2024 and beyond.

In addition, the laws of other countries may not protect our patent rights to the same extent as the laws of the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Many companies have encountered significant difficulties in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, including certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property protection, particularly those relating to medical devices, which could make it difficult for us to stop the infringement of our patent rights or the marketing of competing products in violation of our intellectual property and proprietary rights generally. For this or other reasons, we may not pursue or obtain patent protection in all major markets or may not obtain protection that enables us to prevent the entry of third parties onto the market.

25

Additionally, proceedings to enforce our intellectual property and proprietary rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, put our patents at risk of being invalidated or interpreted narrowly, put our patent applications at risk of not issuing and provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate, and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our intellectual property and proprietary rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license.

Further, many countries have compulsory licensing laws under which a patent owner may be compelled to grant licenses to third parties. In addition, many countries limit the enforceability of patents against government agencies or government contractors. In these countries, the patent owner may have limited remedies, which could materially diminish the value of such patent. If we are forced to grant a license to third parties with respect to any patents relevant to our business, our competitive position may be impaired, and our business, financial condition, results of operations and prospects may be adversely affected.

In addition, our patent rights underlying our products may not be adequate, and our competitors or customers may design around our proprietary technologies or independently develop similar or alternative technologies or products that are equal or superior to our technology and products without infringing on any of our patent rights. In addition, the patents licensed or issued to us may not provide a competitive advantage. If any of these events were to occur, our ability to compete in the market would be harmed.

Other rights and measures we have taken to protect our intellectual property may not be adequate, which would harm our ability to compete in the market.

In addition to patents, we rely on a combination of trade secrets, copyright and trademark laws, confidentiality, nondisclosure and assignment of invention agreements and other contractual provisions and technical measures to protect our intellectual property rights. We rely on trade secrets to protect the technology and algorithms we use in our customer data processing and warehousing information system. While we currently require employees, consultants and other third parties to enter into confidentiality, non-disclosure or assignment of invention agreements or a combination thereof where appropriate, any of the following could still occur:

•the agreements may be breached or not enforced in a particular jurisdiction;

•we may have inadequate remedies for any breach;

•trade secrets and other proprietary information could be disclosed to our competitors; or

•others may independently develop substantially equivalent proprietary information and techniques or otherwise gain access to our trade secrets or disclose such technologies.

If, for any of the above reasons, our intellectual property is disclosed or misappropriated, it would harm our ability to protect our rights and our competitive position.

We may need to initiate lawsuits to protect or enforce our patents and other intellectual property rights, which could be expensive and, if we lose, could cause us to lose some of our intellectual property rights, which would harm our ability to compete in the market.

We rely on patents to protect a portion of our intellectual property and our competitive position. Patent law relating to the scope of claims in the technology fields in which we operate is still evolving and, consequently, patent positions in the medical device industry are generally uncertain. In order to protect or enforce our patent rights, we may initiate patent litigation against third parties, such as infringement suits or interference proceedings. Litigation may be necessary to:

•assert claims of infringement;

•enforce our patents;

•protect our trade secrets or know-how; or

•determine the enforceability, scope and validity of the proprietary rights of others.

Any lawsuits that we initiate could be expensive, take significant time and divert management’s attention from other business concerns. Litigation also puts our patents at risk of being invalidated or interpreted narrowly and our patent applications at risk of not issuing. Additionally, we may provoke third parties to assert claims against us. We may not prevail in

26

any lawsuits that we initiate and the damages or other remedies awarded, if any, may not be commercially valuable. The occurrence of any of these events could harm our business, our ability to compete in the market or our reputation.

Claims that our products infringe on the proprietary rights of others could adversely affect our ability to sell our products and increase our costs.

Substantial litigation over intellectual property rights exists in the medical device industry. We expect that our products could be increasingly subject to third-party infringement claims as the number of competitors grows and the functionality of products and technology in different industry segments overlap. Third parties may currently have, or may eventually be issued, patents on which our products or technologies may infringe. Any of these third parties might make a claim of infringement against us. Any litigation regardless of its impact would likely result in the expenditure of significant financial resources and the diversion of management’s time and resources. In addition, litigation in which we are accused of infringement may cause negative publicity, adversely impact prospective customers, cause product shipment delays or require us to develop non-infringing technology, make substantial payments to third parties, or enter into royalty or license agreements, which may not be available on acceptable terms, or at all. If a successful claim of infringement were made against us and we could not develop non-infringing technology or license the infringed or similar technology on a timely and cost-effective basis, our revenues may decrease substantially and we could be exposed to significant liability.

Risks Related to Our Common Stock

Future sales of securities may cause our stock price to decline as a result of the dilution which will occur to existing stockholders.

Until such time as we are profitable, as to which we can make no assurance, we may need additional funds to develop our business and sustain our operations. We have sold shares of common stock, convertible preferred stock and warrants on several occasions in the past, and any additional sales of shares of our common stock or other securities exercisable into our common stock are likely to have a dilutive effect on some or all of our then existing stockholders. Resales of newly issued shares in the open market could also have the effect of lowering our stock price, thereby increasing the number of shares we may need to issue in the future to raise the same dollar amount and consequently further diluting our outstanding shares.

The perceived risk associated with the possible sale of a large number of shares could cause some of our stockholders to sell their stock, thus causing the price of our stock to decline. In addition, actual or anticipated downward pressure on our stock price due to actual or anticipated issuances or sales of stock could cause some institutions or individuals to engage in short sales of our common stock, which may itself cause the price of our stock to decline.

If our stock price declines, it may be difficult to raise additional capital and it could impair our ability to attract and retain qualified employees, reduce the liquidity of our common stock, and result in the delisting of our common stock from Nasdaq.

The trading price of our common stock has been volatile and is likely to be volatile in the future.

The trading price of our common stock has been highly volatile. For the two-year period ended December 31, 2023, our stock price has fluctuated from a low of $3.05 to a high of $59.28. The market price for our common stock will be affected by a number of factors, including:

•the denial or delay of regulatory clearances or approvals for our products under development or receipt of regulatory approval of competing products;

•our ability to accomplish clinical, regulatory and other product development and commercialization milestones and to do so in accordance with our timing estimates;

•changes in policies affecting third-party coverage and reimbursement in the United States and other countries;

•changes in government regulations and standards affecting the medical device industry and our products;

•ability of our products to achieve market success;

•the performance of third-party contract manufacturers and component suppliers;

•actual or anticipated variations in our results of operations or those of our competitors;

•announcements of new products, technological innovations or product advancements by us or our competitors;

•developments with respect to patents and other intellectual property rights;

27

•sales of common stock or other securities by us or our stockholders in the future;

•additions or departures of key scientific or management personnel;

•disputes or other developments relating to proprietary rights, including patents, litigation matters and our ability to obtain patent protection for our technologies;

•trading volume of our common stock;

•regulatory inquiries or developments affecting our products;

•changes in earnings estimates or recommendations by securities analysts, failure to obtain or maintain analyst coverage of our common stock or our failure to achieve analyst earnings estimates;

•public statements by analysts or clinicians regarding their perceptions of our clinical results or the effectiveness of our products;

•decreases in market valuations of medical device companies; and

•general market conditions and other factors unrelated to our operating performance or the operating performance of our competitors.

The stock prices of many companies in the medical device industry have experienced wide fluctuations that have often been unrelated to the operating performance of these companies. Periods of volatility in the market price of a company’s securities can result in securities class action litigation against a company. If class action litigation is initiated against us, we may incur substantial costs and our management’s attention may be diverted from our operations, which could significantly harm our business.

We have, in the past, failed to satisfy certain continued listing requirements on Nasdaq and could fail to satisfy those requirements again in the future which could affect the market price of our common stock and liquidity and reduce our ability to raise capital.

We have, in the past, failed to satisfy certain continued listing requirements on Nasdaq. For example, as previously disclosed, on August 8, 2023, we received a deficiency letter from the Nasdaq Listing Qualifications Department notifying us that because the closing bid price of our common stock had fallen below $1.00 per share for 30 consecutive business days, we no longer met the bid price requirement. We were able to regain compliance with the minimum bid price requirement within the prescribed 180-day compliance period by effecting a reverse stock split, and currently, our common stock trades on Nasdaq. However, if we fail to maintain compliance with any Nasdaq listing requirements in the future, including minimum bid price for our common stock, we could be delisted and our stock would be considered a penny stock under regulations of the SEC and would therefore be subject to rules that impose additional sales practice requirements on broker-dealers who sell our securities. The additional burdens imposed upon broker-dealers by these requirements could discourage broker-dealers from effecting transactions in our common stock, which could severely limit the market liquidity of our common stock and your ability to sell our securities in the secondary market.

The long-term effects of our recently completed reverse stock split on the market price of our common stock cannot be predicted with any certainty, and shares of our common stock have likely experienced decreased liquidity as a result of the reverse stock split.

On November 21, 2023, we effected a reverse stock split of the Company’s common stock, at a ratio of 1-for-8, to comply with Nasdaq’s minimum bid price requirement. The liquidity of our common stock has likely been adversely affected and may continue to be adversely affected by the reverse stock split given the reduced number of shares of our common stock that are now outstanding following the reverse stock split, particularly if the market price of our common stock does not increase from its recent decline after the reverse stock split. As a result of the lower number of shares outstanding following the reverse stock split, the market for our common stock may also become more volatile, which may lead to reduced trading and a smaller number of market makers for our common stock. The reverse stock split also increased the number of stockholders who own “odd lots” of less than 100 shares of common stock. A purchase or sale of less than 100 shares of common stock (an “odd lot” transaction) may result in incrementally higher trading costs through certain brokers, particularly “full service” brokers. Therefore, those stockholders who own fewer than 100 shares of common stock following the reverse stock split may be required to pay higher transaction costs if they sell their common stock.

There can be no assurance that our share prices will attract new investors, including institutional investors. In addition, there can be no assurance that the market price of our common stock will satisfy the investing requirements of those investors. The trading liquidity of our common stock may not improve.

28

Anti-takeover provisions in our organizational documents and Delaware law, and the shareholder rights plan that we adopted in 2007 and updated in 2021, may discourage or prevent a change of control, even if an acquisition would be beneficial to our stockholders, which could affect our stock price adversely and prevent attempts by our stockholders to replace or remove our current management.

Our certificate of incorporation and bylaws contain provisions that could delay or prevent a change of control of our Company or changes in our Board of Directors that our stockholders might consider favorable. Some of these provisions:

•authorize the issuance of preferred stock which can be created and issued by the Board of Directors without prior stockholder approval, with rights senior to those of our common stock;

•provide for a classified Board of Directors, with each director serving a staggered three-year term;

•prohibit our stockholders from filling board vacancies, calling special stockholder meetings, or taking action by written consent;

•provide for the removal of a director only with cause and by the affirmative vote of the holders of 75% or more of the shares then entitled to vote at an election of our directors; and

•require advance written notice of stockholder proposals and director nominations.

We have also adopted a shareholder rights plan that could make it more difficult for a third party to acquire, or could discourage a third party from acquiring, us or a large block of our common stock. A third party that acquires 15% or more of our common stock could suffer substantial dilution of its ownership interest under the terms of the shareholder rights plan through the issuance of common stock to all stockholders other than the acquiring person.

In addition, we are subject to the provisions of Section 203 of the Delaware General Corporation Law, which may prohibit certain business combinations with stockholders owning 15% or more of our outstanding voting stock. These and other provisions in our certificate of incorporation, bylaws and Delaware law could make it more difficult for stockholders or potential acquirers to obtain control of our Board of Directors or initiate actions that are opposed by our then-current Board of Directors, including a merger, tender offer, or proxy contest involving our Company. Any delay or prevention of a change of control transaction or changes in our Board of Directors could cause the market price of our common stock to decline.

We do not intend to pay cash dividends.

We have never declared or paid cash dividends on our capital stock. We currently intend to retain all available funds and any future earnings for use in the operation and expansion of our business and do not anticipate paying any cash dividends in the foreseeable future. As a result, capital appreciation, if any, of our common stock will be our stockholders’ sole source of potential gain for the foreseeable future.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 1C. CYBERSECURITY

We operate in the medical device industry, which is subject to various cybersecurity risks that could adversely affect our business, financial condition, and results of operations, including intellectual property theft; fraud; extortion; harm to employees or customers; violation of privacy laws and other litigation and legal risk; and reputational risk. We have initiated a risk-based approach designed to identify and assess the cybersecurity threats that could affect our business and information systems. Our strategy is to maintain a high level of risk awareness, identify critical IT assets, regularly update or replace those assets, and systematically perform vulnerability testing, and to promptly remediate deficiencies. Our cybersecurity program is aligned with industry standards and best practices, such as the National Institute of Standards and Technology (NIST) Cybersecurity Framework.

We are adopting various tools and methodologies to manage cybersecurity risk that will be tested on a regular cadence. We are also in the process of monitoring and evaluating our cybersecurity posture and performance on an ongoing basis through scheduled vulnerability scans, penetration tests and threat intelligence feeds. We require third-party service providers with access to personal, confidential or proprietary information to implement and maintain comprehensive cybersecurity practices consistent with applicable legal standards and industry best practices.

29

Our business depends on the availability, reliability, and security of our information systems, networks, data, and intellectual property. Any disruption, compromise, or breach of our systems or data due to a cybersecurity threat or incident could adversely affect our operations, customer service, product development, and competitive position. They may also result in a breach of our contractual obligations or legal duties to protect the privacy and confidentiality of our stakeholders. Such a breach could expose us to business interruption, lost revenue, ransom payments, remediation costs, liabilities to affected parties, cybersecurity protection costs, lost assets, litigation, regulatory scrutiny and actions, reputational harm, customer dissatisfaction, harm to our vendor relationships, or loss of market share.

Our Board of Directors, the Audit Committee and the Cyber Committee, which is chaired by the Chief Executive Officer and staffed by the IT Director, Chief Financial Officer, Corporate Controller and other management employees, are responsible for overseeing cybersecurity risks and risk management. The Board has assigned oversight responsibility for cybersecurity to the Audit Committee, which is in regular communication with management concerning cybersecurity threats and incidents. The Audit Committee reviews management assessment of cyber controls, control testing and outcomes. The Audit Committee is responsible for keeping the Board informed of significant cybersecurity developments including incidents which might potentially have a material effect on the Company. The Cyber Committee is responsible for evaluating cyber threats, the potential effect on operations and scope of the threat. Threats or incidents which the Cyber Committee has judged to have potentially material consequences will be communicated to the Audit Committee. A meeting of the full Board of Directors, including the Audit Committee, will be convened within 48 hours of the Cyber Committee assessment. If the Board determines that the threat or incident is material, Form 8-K will be finalized and filed within four days following the determination, as required under SEC rules.

The Company is currently in the process of implementing a more formalized cybersecurity program.

ITEM 2. PROPERTIES

Our headquarters, engineering activities, and manufacturing and fulfillment activities are located in an approximately 10,000 square foot leased facility in Woburn, Massachusetts. We believe this facility will be adequate for our needs during the foreseeable future.

ITEM 3. LEGAL PROCEEDINGS

The Company is not party to or aware of any legal proceedings.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

30

PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information

Our common stock is traded on the Nasdaq Capital Market under the symbol “NURO”.

Stockholders

On February 29, 2024, there were approximately 42 stockholders of record of our common stock. This number does not include stockholders for whom shares were held in a “nominee” or “street” name. On February 29, 2024, the last reported sale price per share of our common stock on the Nasdaq Capital Market was $4.06.

Unregistered Sales of Securities

Not applicable

Issuer Purchases of Equity Securities

Not applicable

ITEM 6. [RESERVED]

31

ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

You should read the following discussion of our financial condition and results of operations in conjunction with our selected financial data, our financial statements, and the accompanying notes to those financial statements included elsewhere in this Annual Report on Form 10-K. This discussion contains forward-looking statements that involve risks and uncertainties. For a description of factors that may cause our actual results to differ materially from those anticipated in these forward-looking statements, please refer to the section titled “Risk Factors”, contained in Item 1A of this Annual Report on Form 10-K.

Our Business

NeuroMetrix is a commercial stage neurotechnology company based in Woburn, Massachusetts. The Company’s mission is to improve individual and population health through innovative medical devices and technology solutions for neurological disorders and chronic pain management. We are fully integrated with in-house capabilities spanning research and development, manufacturing, regulatory affairs and compliance, sales and marketing, product fulfillment and customer support. We hold extensive, proprietary intellectual property.

NeuroMetrix created the market for point-of-care nerve testing and introduced sophisticated wearable technology for chronic pain syndromes. Nearly five million patients have been served with our products. Revenue is derived from the sale of medical devices and after-market consumable products and accessories in the United States and select overseas markets. Products are authorized by the FDA and regulators in foreign jurisdictions where appropriate. We have two principal product categories:

•Therapeutic technology – wearable neuromodulation for chronic pain syndromes

•Diagnostic technology - point-of-care peripheral neuropathy assessment

Early detection of peripheral neuropathies, such as DPN, is important because there are no treatment options once the nerves have degenerated. Today’s diagnostic methods for peripheral neuropathies range from a simple monofilament test for lack of sensory perception in the feet to a nerve conduction study performed by a specialist. Our DPNCheck nerve conduction technology provides a rapid, low cost, quantitative test for peripheral neuropathies, including DPN. It addresses an important unmet medical need and is particularly effective in screening large populations. This technology has been evaluated in multiple clinical studies and marketed to domestic MA healthcare providers and insurers and in the Asian markets of Japan and China. MA has historically contributed the majority of DPNCheck revenue and been the driver of product-line growth.

In early 2023, the CMS proposed significant changes to its MA HCC risk adjustment payments and to its MA RADV audit practices. These changes created significant uncertainty in the market among participating healthcare providers and insurers. Subsequently, CMS confirmed that RADV changes would be implemented immediately and applied retroactively, and that changes in HCC payments would be phased in over a three-year period. The changes to HCC risk factor coding significantly reduced CMS payments for population screening for various conditions, including for neuropathy. During 2023, we experienced a significant reduction in MA sales revenue as a result of these CMS reimbursement changes. We reduced our commercial sales team while continuing to support our customer base and working to attract new accounts. However, it is unlikely that there will be a near-term recovery from the decline in revenue of the DPNCheck MA business. DPNCheck sales in Asian markets have remained consistent between the past two years and unaffected by the reimbursement changes in MA.

Chronic pain is a significant public health problem. It is defined by the NIH as pain lasting more than 12 weeks. This contrasts with acute pain which is a normal bodily response to injury or trauma. Chronic pain conditions include low back pain, arthritis, fibromyalgia, neuropathic pain, cancer pain and many others. Chronic pain may be triggered by an injury or there may be an ongoing cause such as disease or illness. There may also be no clear cause. Chronic pain can also lead to other health problems. These can include fatigue, sleep disturbance and mood changes, which cause difficulty in carrying out important activities and contributing to disability and despair. In general, chronic pain cannot be cured. Treatment of chronic pain is focused on reducing pain and improving function. The goal is effective pain management. Nerve stimulation is a long-established category of treatment for chronic pain. This treatment approach is available through implantable devices which have both surgical and ongoing risks, such as migration of the implanted nerve stimulation leads. Non-invasive approaches involving TENS have achieved limited efficacy in practice due to power limitations, inadequate dosing and low patient adherence.

32

Quell is our wearable neuromodulation technology for chronic pain. We believe it is designed to address many of the limitations of traditional TENS. It has been refined over the past seven years with over 204,000 chronic pain patients and is protected by over 20 U.S. utility patents. Patients control and personalize the technology via a mobile phone app, and their utilization and certain clinical metrics may be tracked in the Quell Health Cloud. The degree of technological sophistication, combined with our extensive consumer experience and the compelling results of clinical studies gives us the opportunity to leverage this technology platform into a portfolio of Quell-based prescription (Rx) wearable neurotherapeutics.

The FDA granted Breakthrough Device Designation in 2021 for a Quell - Fibromyalgia indication. Following a pivotal double-blind, randomized, sham-controlled clinical study, FDA approved a De Novo marketing authorization in 2022 and Quell – Fibromyalgia, the first product of the emerging prescription portfolio, was launched.

Quell also received FDA Breakthrough Device Designation in early 2022 for the treatment of chronic CIPN. A CIPN double-blind, randomized, sham-controlled clinical study employing Quell and funded by the NCI and the NIH was completed in 2023 and a 510(k) application has been filed with FDA for marketing authorization for CIPN patients with moderate to severe neuropathic pain and cramps. Review and approval of the application by FDA could lead to market introduction of Quell - CIPN in late 2024. This would be the second product in our emerging portfolio of Quell-based prescription wearable therapeutics. We plan a similar approach to other disease indications involving chronic pain. These potentially include Fibromyalgia-like Long COVID, Chronic Low Back Pain, and COPC.

ADVANCE is a legacy, point-of-care neurodiagnostic technology primarily used for the diagnosis and screening for CTS. Manufacturing of ADVANCE devices was discontinued in 2012; however, we continue to service devices and provide disposable electrodes to a customer base of hand surgeons and manufacturers for industrial health use.

Results of Operations

Comparison of Years Ended December 31, 2023 and December 31, 2022

	Fiscal Year						Increase (Decrease)
	2023			2022			Amount		Percent
Revenues	$	5,901,425		$	8,256,073		$	(2,354,648)	(28.5)	%
Gross profit	$	3,947,413		$	5,750,240		$	(1,802,827)	(31.4)	%
–% of revenues	66.9		%	69.6		%
Operating expenses	$	11,098,934		$	10,492,006		$	606,928	5.8	%
Other income	$	622,034		$	325,157		$	296,877	91.3	%
Net loss	$	(6,529,487)		$	(4,416,609)		$	2,112,878	47.8	%
Net loss per share of common stock	$	(6.27)		$	(4.97)		$	1.30	26.2	%

Revenues

Revenues for 2023 decreased by $2.4 million, or 28.5%, from 2023. DPNCheck contributed the majority of revenues in both years. It posted a revenue drop of 25.2% in 2023, primarily attributable to adverse CMS reimbursement changes in the Medicare Advantage market which created significant uncertainty among healthcare providers and reduced patient screening for various conditions, including for peripheral neuropathy. Also, 2023 was the first full year following the discontinuation of Quell (OTC) which we took off the market in Q4 2022. Sales of the Company’s first Rx indication, Quell – Fibromyalgia, partially offset the loss of Quell OTC sales. Legacy ADVANCE revenues continued to decline with erosion of its customer base.

Gross Profit

Gross profit for 2023 decreased by $1.8 million or 31.4% from 2022 primarily due to the drop in DPNCheck sales. The gross margin rate contracted by 2.7 percentage points to 66.9% reflecting decreased production efficiency and higher unabsorbed costs relative to production volume.

Operating Expenses

33

Operating expenses increased in 2023 by $0.6 million or 5.8% from 2022. The net increase encompassed expansion of the Quell – Fibromyalgia sales team, inflation-related increases in personnel costs, higher professional fees offset by reduced outside engineering services.

Research and development spending in 2023 of $2.8 million decreased by 14.3% or $462 thousand from 2022, primarily due to a reduction in outside engineering support for Quell, a drop of $585 thousand from the prior year offset by increased personnel costs of $113 thousand. Sales and marketing spending of $3.4 million in 2023 increased by $500 thousand or 17.4% reflecting the addition of Quell headcount and personnel costs. General and administrative costs of $5.0 million increased by $569 thousand or 13% from 2022. Personnel costs (including equity compensation) increased by $398 thousand or 24.2% and professional services costs increased by $204 thousand or 44.7%.

Other Income

Other income reflects the effects of higher interest rates in 2023 on interest income from the Company's securities portfolio and its commercial bank account.

Net loss

Net loss in 2023 was $6.5 million or $6.27 per share of common stock versus a net loss in 2022 of $4.4 million, or $4.97 per share of common stock. Shares of common stock outstanding were 1,524,939 at December 31, 2023 versus 971,492 at December 31, 2022. The Company executed a one-for-eight reverse split of its common stock in November 2023.

Liquidity and Capital Resources

The following table contains certain key performance indicators we believe depict our liquidity and cash flow position:

	Years Ended December 31,
	2023		2022
Cash, cash equivalents and marketable securities	$	17,997,151	$	21,199,727
Working capital	$	19,613,803	$	23,000,575
Current ratio	16.8		21.8
Net debt position	$	(16,664,027)	$	(19,885,799)
Days sales outstanding	35.6		20.9
Inventory turnover	1.2		1.8

Our primary sources of liquidity are cash, cash equivalents and marketable securities, collections on sales of our products, and net proceeds from equity sales. We believe that our resources are sufficient to fund our cash requirements over at least the next twelve months from the date of issuance of the financial statements.

As of December 31, 2023, we had $18 million in cash, cash equivalents and marketable securities, working capital of $19.6 million, and a current ratio of 16.8. We had no term debt or borrowings at the end of 2023 and 2022, which contributed to a negative net debt position at each year end. (Net debt position is defined as short-term and long-term financial obligations, less cash, cash equivalents and marketable securities.) These measures indicate adequate liquidity and capitalization of the company.

Days sales outstanding (DSO) reflect our customer payment terms which vary from payment on order to 60 days from shipment date. The increase in DSO in 2023 in comparison with the prior year reflects a greater weighting during 2023 of DPNCheck sales with terms of 30 to 60 days plus extended payment terms provided to a long-term DPNCheck customer related to a volume-based contract. Inventory turnover rate declined during 2023 due to reduced sales volume.

34

Cash Flows

	Years Ended December 31,
	2023		2022		Change
Net cash provided by (used in):
–Operating activities	$	(6,084,868)	$	(5,289,416)	$	(795,452)
–Investing activities	$	1,156,353	$	(16,811,699)	$	17,968,052
–Financing activities	$	2,325,441	$	3,864,031	$	(1,538,590)
Net decrease in cash and cash equivalents	$	(2,603,074)	$	(18,237,084)

Operating activities

Operations cash usage in 2023 increased by $0.8 million from 2022. This reflected an increased net loss of $2.1 million in 2023 partially offset by net reductions in non-cash elements of the net loss plus changes in operating assets and liabilities from 2022.

Investing activities

Proceeds from maturities of marketable securities, net of reinvestments and fixed asset purchases were $1.2 million in 2023. Investing activity in 2022 included the establishment of a portfolio of marketable securities as well as fixed asset purchases. Investing activities in 2022 include cash deployment of cash reserves into marketable securities valued at $16.8 million. Fixed asset purchases were $184 thousand in 2023 and $23 thousand in 2022.

Financing activities

During 2023 we raised net proceeds of $2.3 million from the sale of shares of common stock, registered under a shelf registration statement, to investors utilizing an At-The-Market (ATM) facility and administered by an investment bank. This amount compared with $3.9 million raised under the ATM in 2022. The 2023 activity allowed us to offset a significant portion of our net cash usage in operations and to close the year with cash, cash equivalents and securities of approximately $18 million.

We continue to maintain an effective shelf registration statement covering the sales of shares of our common stock and other securities, giving us the opportunity to raise funding when needed or otherwise considered appropriate at prices and on terms to be determined at the time of any such offerings. Pursuant to the instructions to Form S-3, we have the ability to sell shares under the shelf registration statement, during any 12-month period, in an amount less than or equal to one-third of the aggregate market value of our common stock held by non-affiliates. If we raise additional funds by issuing equity or debt securities, either through the sale of securities pursuant to a registration statement or by other means, our existing stockholders may experience dilution, and the new equity or debt securities may have rights, preferences and privileges senior to those of our existing stockholders.

Critical Accounting Policies and Estimates

Our financial statements are based on the selection and application of generally accepted accounting principles, which require us to make estimates and assumptions about future events that affect the amounts reported in our financial statements and the accompanying notes. Future events and their effects cannot be determined with certainty. Therefore, the determination of estimates requires the exercise of judgment. Actual results could differ significantly from those estimates, and any such differences may be material to our financial statements. We believe that the policies set forth below may involve a higher degree of judgment and complexity in their application than our other accounting policies and represent the critical accounting policies used in the preparation of our financial statements. If different assumptions or conditions were to prevail, the results could be materially different from our reported results. Our significant accounting policies are presented within Note 2 to our Financial Statements.

35

Inventories

Inventories, consisting primarily of finished goods and purchased components, are stated at the lower of cost or net realizable value. Cost is determined using the first-in, first-out inventory valuation method. We perform an analysis of inventory valuation on at least a quarterly basis to determine whether the inventory carrying value exceeds its net realizable value. Net realizable value is based on current selling price and estimated future sales volume. Should market conditions deteriorate, our inventory realization could be lower than estimated net realizable value.

Recently Issued or Adopted Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB") and are adopted by us as of the specified effective date. Unless otherwise discussed, we believe that the impact of recently adopted and recently issued accounting pronouncements will not have a material impact on our balance sheets, results of operations and cash flows.

ITEM 8. Financial Statements and Supplementary Data

The information required by this item may be found on pages F-1 through F-21 of this Annual Report on Form 10-K.

ITEM 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

ITEM 9A. Controls and Procedures

(a) Evaluation of disclosure controls and procedures.

Our principal executive officer and principal financial officer, after evaluating the effectiveness of our disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) as of the end of the period covered by this Form 10-K, have concluded that, based on such evaluation, our disclosure controls and procedures were effective to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms, and is accumulated and communicated to our management, including our principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

(b) Management’s Report on Internal Control Over Financial Reporting.

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. Under the supervision and with the participation of our management, including our Chief Executive Officer and our Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal controls over financial reporting as of December 31, 2023 based on the criteria in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on our evaluation under the framework in Internal Control – Integrated Framework (2013) issued by the COSO, our management concluded that our internal control over financial reporting was effective as of December 31, 2023.

This Annual Report on Form 10-K does not include an attestation report of our independent registered public accounting firm regarding internal control over financial reporting. Management’s report is not subject to attestation by our independent registered public accounting firm pursuant to rules of the SEC that permit us to provide only management’s report in this Annual Report on Form 10-K.

(c) Changes in internal control over financial reporting.

36

There have been no changes to our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during our most recent quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B. Other Information

On February 20, 2024, we entered into Amendment No. 16 to our Shareholder Rights Agreement (“Amendment No. 16”) with Equiniti Trust Company, LLC dated as of March 7, 2007, as amended. Amendment No. 16 extends the term of the Shareholder Rights Agreement by an additional year. The foregoing description of Amendment No. 16 is subject to, and is qualified in its entirety by reference to, the full text of Amendment No. 16, a copy of which is set forth as Exhibit 4.3.17 to this Annual Report on Form 10-K and is incorporated herein by reference.

Rule 10b5-1 Trading Plans

During the year ended December 31, 2023, no directors or executive officers entered into, modified or terminated, contracts, instructions or written plans for the sale or purchase of the Company’s securities that were intended to satisfy the affirmative defense conditions of Rule 10b5-1.

ITEM 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicable.

37

PART III

ITEM 10. Directors, Executive Officers and Corporate Governance

Information Regarding the Directors and Executive Officers

Name	Age	Position
Shai N. Gozani, M.D., Ph.D.	59	Chairman of the Board, Chief Executive Officer, President and Secretary
Thomas T. Higgins	72	Senior Vice President, Chief Financial Officer and Treasurer
Bradley M. Fluegel	62	Director
David E. Goodman, M.D.	67	Director
Nancy E. Katz	64	Director
David Van Avermaete	72	Director

Shai N. Gozani, M.D., Ph.D. founded our company in 1996 and currently serves as Chairman of our Board of Directors and as our President, Chief Executive Officer and Secretary. Since founding our company in 1996, Dr. Gozani has served in a number of positions at our company including Chairman since 1996, President from 1996 to 1998 and from 2002 to the present, Chief Executive Officer since 1997 and Secretary since July 2008. Dr. Gozani holds a B.A. in computer science, an M.S. in Biomedical Engineering and a Ph.D. in Neurobiology, from the University of California, Berkeley. He also received an M.D. from Harvard Medical School and the Harvard-M.I.T. Division of Health Sciences at M.I.T. Prior to forming our company, Dr. Gozani completed a neurophysiology research fellowship in the laboratory of Dr. Gerald Fischbach at Harvard Medical School. Dr. Gozani has published articles in the areas of basic and clinical neurophysiology, biomedical engineering and computational chemistry. Since 2019 Dr. Gozani has served on the Board of Directors of Madorra, Inc. The Board has concluded that Dr. Gozani should serve as a director because Dr. Gozani’s extensive knowledge of engineering and neurophysiology, combined with the unique understanding of our technology and business he has gained as our founder and as a key executive, provides invaluable insight to our Board and to the entire organization.

Bradley M. Fluegel has served as a member of our Board of Directors since June 2022. Since January 2018, Mr. Fluegel has been a principal of BMF Advisors, where he advises healthcare companies. He previously served as Senior Vice President, Chief Healthcare Commercial Market Development Officer of Walgreens from August 2015 to January 2018 and prior to that Chief Strategy Officer of Walgreens from September 2012 to August 2015. From April 2011 to September 2012, Mr. Fluegel served as Executive in Residence at Health Evolution Partners, a healthcare private equity firm. Mr. Fluegel served as Executive Vice President and Chief Strategy and External Affairs Officer of WellPoint, Inc. (now Elevance Health) from September 2007 to December 2010. Prior to that, Mr. Fluegel served as Senior Vice President of National Accounts and Vice President, Enterprise Strategy at Aetna, Inc. Mr. Fluegel currently serves on the board of directors of Performant Financial Corporation (Nasdaq: PFMT) and American Oncology Network (Nasdaq: AONC) and formerly served on the board of directors of Itamar Medical Ltd. prior to Zoll Medical's acquisition of the company and Fitbit, Inc. prior to Google’s acquisition of the company. Mr. Fluegel received an M.P.P.from Harvard University’s Kennedy School of Government and a B.A. in Business Administration from the University of Washington. He also serves as a lecturer at the University of Pennsylvania’s Wharton School of Business. Mr. Fluegel’s qualifications to serve on the Board include his extensive executive experience and his background in the healthcare industry.

David E. Goodman, M.D., M.S.E. has served as a member of our Board of Directors since June 2004. Since 2013, Dr. Goodman has been running his own independent primary care medical practice where he also manages the care of first responders (police, fire, EMS) injured in the line of duty. From 2013 to 2016, Dr. Goodman served as CEO of Feet First, a technology-focused healthcare services company he co-founded that is committed to preventing the devastating and expensive microvascular complications of diabetes. From 2014 to 2016, Dr. Goodman served as a director of Xtant Medical (OTC QX: BONE), a comprehensive supplier of orthopedic and spine surgery products. From 2012 to 2015, Dr. Goodman served as CMO of FirstVitals, a healthcare services company focused on wellness and prevention. Since 2011, Dr. Goodman has also served as an independent consultant. During 2010, Dr. Goodman served as President and Chief Executive Officer of SEDline, Inc., a research-focused company with the mission to expand the scope and applications for neuromonitoring. From 2008 to 2009, Dr. Goodman served as Executive Vice President of Business Development for Masimo Corporation, a manufacturer of non-invasive patient monitors. From 2006 to 2008, Dr. Goodman served as an independent consultant providing product design, regulatory and analytical consulting services to medical device and biopharmaceutical companies and also served in this

38

capacity from 2003 to 2004 and from 2001 to 2002. From 2005 to 2006, Dr. Goodman served as President and Chief Executive Officer of BaroSense, Inc., a medical device company focused on developing minimally invasive devices for the long-term treatment of obesity. From 2004 to 2005, Dr. Goodman served as President and Chief Executive Officer of Interventional Therapeutic Solutions, Inc., an implantable drug delivery systems company. From 2002 to 2003, Dr. Goodman served as Chairman, President and Chief Executive Officer of Pherin Pharmaceuticals, a pharmaceutical discovery and development company. From 1994 to 2001, Dr. Goodman held various positions, including Chief Executive Officer, Chief Medical Officer and director, for LifeMasters Supported SelfCare, Inc., a disease management services company that Dr. Goodman founded. Dr. Goodman also served as a director of Sound Surgical Technologies LLC, a private manufacturer of aesthetic surgical tools from 2011 until its acquisition by Solta Medical (Nasdaq:SLTM) in 2013. Dr. Goodman holds a B.A.S. in applied science and bioengineering and a M.S.E. in bioengineering from the University of Pennsylvania. He also received an M.D. from Harvard Medical School and the Harvard-M.I.T. Division of Health Sciences and Technology. Dr. Goodman holds 22 issued and pending patents and is a practicing physician with licenses in California and Hawaii. The Board has concluded that Dr. Goodman should serve as a director because Dr. Goodman’s medical and engineering background and his many years of executive experience in the medical device industry provide important experience and expertise to the Board.

Nancy E. Katz has served as a member of our Board of Directors since December 2010. From May 2011 to August 2014, Ms. Katz served as Vice President, Consumer Marketing at Medtronic, Inc., a medical technology company. From July 2005 to July 2010, Ms. Katz was Senior Vice President, Bayer Diabetes Care — North America. Prior to this position, she was President and Chief Executive Officer of Calypte Biomedical Corporation, a manufacturer of HIV diagnostics, President of Zila Pharmaceutical, Inc., a manufacturer of oral care products, and held senior marketing positions with the Lifescan division of Johnson & Johnson (blood glucose diabetes products), Schering-Plough Healthcare Products, and with American Home Products. Since October 2016, Ms. Katz has served on the Board of Directors of Cyanotech Corporation (Nasdaq: CYAN). She has previously served on the Boards of Directors of Neoprobe Corporation (AMEX: NEOP), Calypte Biomedical Corporation, LXN Corporation and Pepgen Corporation. She received a B.S. in business from the University of South Florida. The Board has concluded that Ms. Katz should serve as a director because of her executive level experience in the healthcare industry, as well as consumer marketing expertise which provides the Board with valuable insight in business strategy and execution.

David Van Avermaete has served as a member of our Board of Directors since September 2013. Since January 2015, Mr. Van Avermaete has served as President of Inject Safe Technologies, a privately held company that has developed a bandage specifically designed to support injections. From April 2004 to February 2013, Mr. Van Avermaete served as Chief Executive Officer of VeraLight, Inc., a medical device company he founded, that focuses on non-invasive screening for type 2 diabetes. From 2000 to 2004, Mr. Van Avermaete served as Senior Vice President Non-Invasive Technology of InLight Solutions, a Johnson & Johnson company focused on transformational technology in the diabetes field. From 1998 to 2000, Mr. Van Avermaete served as U.S. President of the LifeScan division of Johnson & Johnson and, from 1990 to 1998, in various senior level positions at LifeScan concentrating in sales and marketing. Previously, Mr. Van Avermaete served as Vice President Sales and Marketing at Biotope, Director of Marketing at Roche Diagnostics, and Director of Marketing and Sales at Syntex Medical Diagnostics. Mr. Van Avermaete received an M.B.A. and an M.S. in Microbiology from the University of Arizona and a Bachelor of Science Degree in medical technology and chemistry from Ball State University. The Board has concluded that Mr. Van Avermaete should serve as a director because his executive level experience in the medical device and diabetes field, as well as in entrepreneurial ventures, provides the Board with a valuable perspective in commercializing medical device products.

Thomas T. Higgins has served as our Senior Vice President, Chief Financial Officer and Treasurer since September 2009. Prior to joining NeuroMetrix, from January 2005 to March 2008, Mr. Higgins was Executive Vice President and Chief Financial Officer at Caliper Life Sciences, Inc., a provider of technology and services for life sciences research. Before Caliper, Mr. Higgins was Executive Vice President, Operations and Chief Financial Officer at V.I. Technologies, Inc. (Vitex), a biotechnology company addressing blood safety. Before Vitex, Mr. Higgins served at Cabot Corporation in various senior finance and operations roles. His last position at Cabot was President of Distrigas of Massachusetts Corporation, a subsidiary involved in the liquefied natural gas business, and prior to that he was Vice President and General Manager of Cabot’s Asia Pacific carbon black operations. Before joining Cabot, Mr. Higgins was with PricewaterhouseCoopers where he started his career. Mr. Higgins holds a B.B.A. with honors from Boston University.

Other information required by this item is incorporated by reference from the discussion responsive thereto under the captions “Board Matters and Corporate Governance,” “Information Regarding the Directors and Executive Officers,” “Code of Business Conduct and Ethics” and “Delinquent Section 16(a) Reports” in our proxy statement for the 2024 Annual Meeting of Stockholders (the 2024 Proxy Statement).

39

ITEM 11. Executive Compensation

The response to this item is incorporated by reference from the discussion responsive thereto under the captions “Directors’ Compensation” and “Compensation of Executive Officers” in our 2024 Proxy Statement.

ITEM 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The response to this item is incorporated by reference from the discussion responsive thereto under the captions “Security Ownership of Certain Beneficial Owners and Management” and “Equity Compensation Plan Information” in our 2024 Proxy Statement.

ITEM 13. Certain Relationships and Related Transactions, and Director Independence

The response to this item is incorporated by reference from the discussion responsive thereto under the captions “Certain Relationships and Related Person Transactions” and “Board Matters and Corporate Governance” in our 2024 Proxy Statement.

ITEM 14. Principal Accounting Fees and Services

The response to this item is incorporated by reference from the discussion responsive thereto under the caption “Accounting Fees” in our 2024 Proxy Statement.

40

PART IV

ITEM 15. Exhibits and Financial Statement Schedule

(a)  1. Financial Statements

The financial statements are listed in the accompanying index to financial statements on page F-1.

2. Financial Statement Schedule

The financial statement schedule is listed in the accompanying index to financial statements on page F-1. Other financial statement schedules required under this Item and Item 8 are omitted because they are not applicable or the required information is shown in the financial statements or the footnotes thereto.

3. Exhibit Index

The following is a list of exhibits filed as part of this Annual Report on Form 10-K:

Exhibit Number	Exhibit Description	Filed with this Report	Incorporated by Reference herein from Form or Schedule	Filing Date	SEC File/ Registration Number
3.1.1	Third Amended and Restated Certificate of Incorporation of NeuroMetrix, Inc. dated July 27, 2004		S-8 (Exhibit 4.1)	8/9/2004	333-118059
3.1.2	Certificate of Designations for Series A Junior Cumulative Preferred Stock, par value $0.001 per share, dated March 7, 2007		8-A12(b) (Exhibit 3.1)	3/8/2007	001-33351
3.1.3	Certificate of Amendment to Restated Certificate of Incorporation of NeuroMetrix, Inc. dated September 1, 2011		8-K (Exhibit 3.1)	9/1/2011	001-33351
3.1.4	Certificate of Amendment to Restated Certificate of Incorporation of NeuroMetrix, Inc. dated February 15, 2013		8-K (Exhibit 3.1)	2/15/2013	001-33351
3.1.5	Certificate of Amendment to Restated Certificate of Incorporation of NeuroMetrix, Inc. dated December 1, 2015		8-K (Exhibit 3.1)	12/1/2015	001-33351
3.1.6	Certificate of Amendment of Restated Certificate of Incorporation of NeuroMetrix, Inc. dated May 11, 2017		8-K (Exhibit 3.1)	5/12/2017	001-33351
3.1.7	Certificate of Amendment to Restated Certificate of Incorporation of NeuroMetrix, Inc. dated November 18, 2019		8-K (Exhibit 3.1)	11/18/2019	001-33351
3.1.8	Certificate of Amendment to Restated Certificate of Incorporation of NeuroMetrix, Inc. dated November 20, 2023		8-K (Exhibit 3.1)	11/20/2023	001-33351
3.1.9	Certificate of Designation of Preferences, Rights and Limitations of Series A-1 Convertible Preferred Stock, par value $0.001 per share, dated June 5, 2013		8-K (Exhibit 3.1)	6/6/2013	001-33351
3.1.10	Certificate of Designation of Preferences, Rights and Limitations of Series A-2 Convertible Preferred Stock, par value $0.001 per share, dated June 5, 2013		8-K (Exhibit 3.2)	6/6/2013	001-33351
3.1.11	Certificate of Designation of Preferences, Rights and Limitations of Series A-3 Convertible Preferred Stock, par value $0.001 per share, dated June 24, 2014		8-K (Exhibit 3.1)	6/25/2014	001-33351
3.1.12	Certificate of Designation of Preferences, Rights and Limitations of Series A-4 Convertible Preferred Stock, par value $0.001 per share, dated June 24, 2014		8-K (Exhibit 3.2)	6/25/2014	001-33351

41

Exhibit Number	Exhibit Description	Filed with this Report	Incorporated by Reference herein from Form or Schedule	Filing Date	SEC File/ Registration Number
3.1.13	Certificate of Designation of Preferences, Rights and Limitations of Series B Convertible Preferred Stock, par value $0.001 per share, dated May 26, 2015		8-K (Exhibit 3.1)	5/29/2015	001-33351
3.1.14	Certificate of Designation of Preferences, Rights and Limitations of Series C Convertible Preferred Stock, par value $0.001 per share, dated December 30, 2015		8-K (Exhibit 3.1)	12/30/2015	001-33351
3.1.15	Certificate of Designation of Preferences, Rights and Limitations of Series D Convertible Preferred Stock, par value $0.001 per share, dated June 3, 2016		8-K (Exhibit 3.1)	6/3/2016	001-33351
3.1.16	Certificate of Designation of Preferences, Rights and Limitations of Series E Convertible Preferred Stock, par value $0.001 per share, dated December 28, 2016		8-K (Exhibit 3.1)	12/29/2016	001-33351
3.1.17	Certificate of Designation of Preferences, Rights and Limitations of Series F Convertible Preferred Stock, par value $0.001 per share, dated July 10, 2017		8-K (Exhibit 3.1)	7/11/2017	001-33351
3.2.1	Amended and Restated Bylaws of NeuroMetrix, Inc.		8-K (Exhibit 3.1)	12/10/2021	001-33351
4.1	Description of Securities of the Registrant		10-K (Exhibit 4.1)	1/28/2022	001-33351
4.2	Specimen Certificate for Shares of Common Stock		S-1/A (Exhibit 4.1)	7/19/2004	333-115440
4.3.1	Shareholder Rights Agreement, dated as of March 7, 2007, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		8-A12(b) (Exhibit 4.1)	3/8/2007	001-33351
4.3.2	Amendment to Shareholder Rights Agreement, dated September 8, 2009, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		8-K (Exhibit 4.1)	9/14/2009	001-33351
4.3.3	Amendment No. 2 to Shareholder Rights Agreement, dated June 5, 2013, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		8-K (Exhibit 4.2)	6/6/2013	001-33351
4.3.4	Amendment No. 3 to Shareholder Rights Agreement, dated June 25, 2014, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		8-K (Exhibit 4.2)	6/25/2014	001-33351
4.3.5	Amendment No. 4 to Shareholder Rights Agreement, dated May 28, 2015, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		10-Q (Exhibit 4.1)	7/23/2015	001-33351
4.3.6	Amendment No. 5 to Shareholder Rights Agreement, dated December 29, 2015, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		8-K (Exhibit 4.3)	12/30/2015	001-33351

42

Exhibit Number	Exhibit Description	Filed with this Report	Incorporated by Reference herein from Form or Schedule	Filing Date	SEC File/ Registration Number
4.3.7	Amendment No. 6 to Shareholder Rights Agreement, dated June 3, 2016, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		8-K (Exhibit 4.2)	6/3/2016	001-33351
4.3.8	Amendment No. 7 to Shareholder Rights Agreement, dated December 28, 2016, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		8-K (Exhibit 4.2)	12/29/2016	001-33351
4.3.9	Amendment No. 8 to Shareholder Rights Agreement, dated February 8, 2017, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		10-K (Exhibit 4.2.9)	2/8/2017	001-33351
4.3.10	Amendment No. 9 to Shareholder Rights Agreement, dated July 10, 2017, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		8-K (Exhibit 4.2)	7/11/2017	001-33351
4.3.11	Amendment No. 10 to Shareholder Rights Agreement, dated February 5, 2018, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		10-K (Exhibit 4.2.11)	2/8/2018	001-33351
4.3.12	Amendment No. 11 to Shareholder Rights Agreement, dated January 21, 2019, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		10-K (Exhibit 4.2.11)	1/24/2019	001-33351
4.3.13	Amendment No. 12 to Shareholder Rights Agreement, dated January 27, 2020, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		10-K (Exhibit 4.3.13)	1/28/2020	001-33351
4.3.14	Amendment No. 13 to Shareholder Rights Agreement, dated January 25, 2021, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		10-K (Exhibit 4.3.14)	1/29/2021	001-33351
4.3.15	Amendment No. 14 to Shareholder Rights Agreement, dated July 20, 2021, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		10-Q (Exhibit 4.1)	7/22/2021	001-33351
4.3.16	Amendment No. 15 to Shareholder Rights Agreement, dated March 6, 2023, between NeuroMetrix, Inc. and American Stock Transfer & Trust Company, as Rights Agent		8-K (Exhibit 4.1)	3/10/2023	001-33351
4.3.17	Amendment No. 16 to Shareholder Rights Agreement, dated February 20, 2024, between NeuroMetrix, Inc. and Equiniti Trust Company LLC, as Rights Agent		8-K/A (Exhibit 4.1)	2/27/2024	001-33351
Lease Agreements
10.1.1	Lease Agreement, dated August 27, 2014, between Cummings Properties, LLC and NeuroMetrix, Inc.		10-Q (Exhibit 10.1)	10/28/2014	011-33351
10.1.2	Lease Extension #1, dated June 14, 2018, between Cummings Properties, LLC and NeuroMetrix, Inc.		10-Q (Exhibit 10.2)	7/19/2018	011-33351
Credit Facilities, Loan and Equity Agreements
10.5.3	Promissory Note with Comerica Bank dated April 27, 2020		8-K (Exhibit 10.1)	4/30/2020	001-33351
10.5.4	Loan Agreement by and between NeuroMetrix, Inc. and Comerica Bank, dated April 27, 2020		8-K (Exhibit 10.2)	4/30/2020	001-33351

43

Exhibit Number	Exhibit Description	Filed with this Report	Incorporated by Reference herein from Form or Schedule	Filing Date	SEC File/ Registration Number
10.5.5	At Market Issuance Sales Agreement by and between NeuroMetrix, Inc. and Ladenburg Thalmann & Co. Inc., dated October 22, 2021		S-3 (Exhibit 1.2)	10/22/2021	333-260438
Equity Compensation Plans
10.6+	Twelfth Amended and Restated 2004 Stock Option and Incentive Plan		14A (Appendix A)	3/16/2021	001-33351
10.7+	2009 Non-Qualified Inducement Stock Plan		S-8 (Exhibit 99.1)	6/3/2009	333-159712
10.8+	Employee Stock Purchase Plan, as amended		S-8 (Exhibit 99.1)	5/19/2022	333-265080
10.9.1+	2022 Equity Incentive Plan		S-8 (Exhibit 99.2)	5/19/2022	333-265080
10.9.2+	Form of Stock Option Agreement under 2022 Equity Incentive Plan		S-8 (Exhibit 99.3)	5/19/2022	333-265080
10.9.3+	Form of Restricted Stock Unit Agreement under 2022 Equity Incentive Plan		S-8 (Exhibit 99.4)	5/19/2022	333-265080
Agreements with Executive Officers and Directors
10.10+	Form of Indemnification Agreement between NeuroMetrix, Inc. and each of its directors		S-1/A (Exhibit 10.8)	6/22/2004	333-115440
10.11.1+	Indemnification Agreement dated June 21, 2004, by and between Shai N. Gozani, M.D., Ph.D., and NeuroMetrix, Inc.		S-1/A (Exhibit 10.20)	6/22/2004	333-115440
10.11.2+	Employment Agreement dated December 30, 2020, by and between NeuroMetrix, Inc. and Shai N. Gozani, M.D., Ph.D., and NeuroMetrix, as amended		10-K (Exhibit 10.12.2)	1/28/2022	001-33351
10.12.1+	Indemnification Agreement, dated September 10, 2009, by and between NeuroMetrix, Inc. and Thomas T. Higgins		8-K (Exhibit 10.2)	9/15/2009	001-33351
10.12.2+	Employment Agreement, dated December 30, 2020 by and between NeuroMetrix, Inc. and Thomas T. Higgins, as amended		10-K (Exhibit 10.13.2)	1/28/2022	001-33351
10.13+	Amended and Restated Management Retention and Incentive Plan, as modified, dated February 3, 2017		10-K (Exhibit 10.17)	2/9/2017	001-33351
10.14+	Amended and Restated Management Retention and Incentive Plan, as modified, dated January 20, 2020		10-K (Exhibit 10.16.2)	1/28/2020	001-33351
Agreements with Respect to Collaborations, Licenses, Research and Development
10.15†	Manufacturing and Supply Agreement, dated as of August 2, 2006, by and between Parlex Polymer Flexible Circuits, Inc. and NeuroMetrix, Inc.		8-K (Exhibit 99.1)	8/2/2006	000-50856
Other
23.1	Consent of Baker Tilly US, LLP, an independent registered public accounting firm.	X

44

Exhibit Number	Exhibit Description	Filed with this Report	Incorporated by Reference herein from Form or Schedule	Filing Date	SEC File/ Registration Number
31.1	Certification of Principal Executive Officer under Section 302 of the Sarbanes-Oxley Act of 2002.	X
31.2	Certification of Principal Accounting and Financial Officer under Section 302 of the Sarbanes-Oxley Act of 2002.	X
32	Certification of the Principal Executive Officer and the Principal Accounting and Financial Officer under Section 906 of the Sarbanes-Oxley Act of 2002.	X
97	Compensation Recovery Policy	X
101.1	The following materials from NeuroMetrix, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2023, formatted in XBRL (Extensible Business Reporting Language): (i) Balance Sheets as of December 31, 2023 and 2022, (ii) Statements of Operations for the years ended December 31, 2023 and 2022, (iii) Statements of Changes in Stockholders’ Equity for the years ended December 31, 2023 and 2022, (iv) Statements of Cash Flows for the years ended December 31, 2023 and 2022, and (v) Notes to Financial Statements.	X
101.INS	XBRL Instance Document	X
101.SCH	XBRL Taxonomy Extension Schema	X
101.CAL	XBRL Taxonomy Extension Calculation Linkbase	X
101.DEF	XBRL Taxonomy Extension Definition Linkbase	X
101.LAB	XBRL Taxonomy Extension Label Linkbase	X
101.PRE	XBRL Taxonomy Extension Presentation Linkbase	X

+ Indicates management contract or any compensatory plan, contract or arrangement.

† Confidential treatment has been granted with respect to certain portions of this Exhibit, which portions have been omitted and filed separately with the Securities and Exchange Commission as part of an application for confidential treatment pursuant to the Securities Exchange Act of 1934, as amended.

ITEM 16. Form 10-K Summary

We may voluntarily include a summary of information required by Form 10-K under this Item 16. We have elected not to include such summary information.

45

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

NEUROMETRIX, INC.

By:	/s/ SHAI N. GOZANI, M.D., PH.D.
	Shai N. Gozani, M.D., Ph.D. Chairman, President and Chief Executive Officer

Date: March 1, 2024

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant on March 1, 2024 in the capacities indicated below.

Name	Title
/s/ SHAI N. GOZANI, M.D., PH.D.	Chairman, President and Chief Executive Officer (Principal Executive Officer)
Shai N. Gozani, M.D., Ph.D.
/s/ THOMAS T. HIGGINS	Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer and Principal Accounting Officer)
Thomas T. Higgins
/s/ BRADLEY M. FLUEGEL	Director
Bradley M. Fluegel
/s/ DAVID E. GOODMAN, M.D.	Director
David E. Goodman, M.D.
/s/ NANCY E. KATZ	Director
Nancy E. Katz
/s/ DAVID VAN AVERMAETE	Director
David Van Avermaete

46

INDEX TO FINANCIAL STATEMENTS

NeuroMetrix, Inc.

Years ended December 31, 2023 and 2022

	Page
Report of Independent Registered Public Accounting Firm (PCAOB ID 23)	F-2
Financial Statements
Balance Sheets	F-3
Statements of Operations	F-4
Statements of Comprehensive Loss	F-4
Statements of Changes in Stockholders’ Equity	F-5
Statements of Cash Flows	F-6
Notes to Financial Statements	F-7
Schedule II — Valuation and Qualifying Accounts	S-1

F-1

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders of NeuroMetrix, Inc.

Opinion on the Financial Statements

We have audited the accompanying balance sheets of NeuroMetrix, Inc. (the Company) as of December 31, 2023 and 2022, and the related statements of operations, comprehensive loss, changes in stockholders’ equity, and cash flows for each of the years in the two year period ended December 31, 2023, and the related notes and schedule (collectively referred to as the financial statements). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the years in the two year period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting, but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

Critical audit matters are matters arising from the current period audit of the financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. We determined that there are no critical audit matters.

/s/ Baker Tilly US, LLP

We have served as the Company's auditor since 2017

Tewksbury, Massachusetts

March 1, 2024

F-2

NeuroMetrix, Inc.

Balance Sheets

	December 31,
	2023		2022
Assets
Current assets:
Cash and cash equivalents	$	1,731,946	$	4,335,020
Available-for-sale securities	16,265,205		—
Held-to-maturity securities	—		16,864,707
Accounts receivable, net of allowances of $25,000 at December 31, 2023 and 2022	518,824		646,771
Inventories	1,559,428		1,614,987
Prepaid expenses and other current assets	779,039		645,502
Total current assets	20,854,442		24,106,987
Fixed assets, net	293,449		165,619
Right of use asset	250,150		370,609
Other long-term assets	26,400		26,400
Total assets	$	21,424,441	$	24,669,615
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable	$	215,509	$	368,082
Accrued expenses and compensation	876,739		589,939
Lease obligation, current portion	148,391		148,391
Total current liabilities	1,240,639		1,106,412
Lease obligation, net of current portion	92,485		207,516
Total liabilities	1,333,124		1,313,928
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock	—		—
Convertible preferred stock	1		1
Common stock, $0.0001 par value; 25,000,000 authorized at December 31, 2023 and 2022; 1,524,939 and 971,492 shares issued and outstanding at December 31, 2023 and 2022, respectively	152		96
Additional paid-in capital	229,960,346		226,935,456
Accumulated other comprehensive income	240,171		—
Accumulated deficit	(210,109,353)		(203,579,866)
Total stockholders’ equity	20,091,317		23,355,687
Total liabilities and stockholders’ equity	$	21,424,441	$	24,669,615

 The accompanying notes are an integral part of these financial statements.

F-3

NeuroMetrix, Inc.

Statements of Operations

	Years Ended December 31,
	2023		2022
Revenues, net	$	5,901,425	$	8,256,073
Cost of revenues	1,954,012		2,505,833
Gross profit	3,947,413		5,750,240
Operating expenses:
Research and development	2,777,960		3,239,725
Sales and marketing	3,365,265		2,865,615
General and administrative	4,955,709		4,386,666
Total operating expenses	11,098,934		10,492,006
Loss from operations	(7,151,521)		(4,741,766)
Other income:
Interest income	257,105		325,157
Other income	364,929		—
Total other income	622,034		325,157
Net loss:	$	(6,529,487)	$	(4,416,609)
Net loss per share of common stock applicable to common stockholders, basic and diluted	$	(6.27)	$	(4.97)

Statements of Comprehensive Loss

	Years Ended December 31,
	2023		2022
Net loss	$	(6,529,487)	$	(4,416,609)
Other comprehensive income:
Unrealized gain on available-for-sale securities	605,100		—
Reclassification of realized gain on available-for-sale securities to other income	(364,929)		—
Comprehensive loss	$	(6,289,316)	$	(4,416,609)

The accompanying notes are an integral part of these financial statements.

F-4

NeuroMetrix, Inc.

 Statements of Changes in Stockholders’ Equity

	Series B Convertible Preferred Stock			Common Stock			Additional Paid-In Capital		Accumulated Other Comprehensive Income		Accumulated Deficit		Total
	Number of Shares	Amount		Number of Shares	Amount
Balance at December 31, 2021	200	$	1	831,310	$	84	$	222,378,958	$	—	$	(199,163,257)	$	23,215,786
Stock-based compensation expense	—	—		—	—		477,062		—		—		477,062
Issuance of common stock under at the market offering	—	—		114,542	11		3,833,761		—		—		3,833,772
Issuance of common stock to settle compensation obligation	—	—		6,276	—		215,417		—		—		215,417
Issuance of common stock under employee stock purchase plan	—	—		2,526	—		30,259		—		—		30,259
Vesting of restricted stock under equity plan	—	—		4,806	1		(1)		—		—		—
Net loss	—	—		—	—		—		—		(4,416,609)		(4,416,609)
Balance at December 31, 2022	200	1		959,460	96		226,935,456		—		(203,579,866)		23,355,687
Stock-based compensation expense	—	—		—	—		699,505		—		—		699,505
Issuance of common stock under at the market offering	—	—		537,094	54		2,305,699		—		—		2,305,753
Issuance of common stock under employee stock purchase plan	—	—		4,902	—		19,688		—		—		19,688
Vesting of restricted stock under equity plan	—	—		17,261	2		(2)		—		—		—
Unrealized gain on available-for-sale securities	—	—		—	—		—		605,100		—		605,100
Realized gain on available-for-sale securities	—	—		—	—		—		(364,929)		—		(364,929)
Net loss	—	—		—	—		—		—		(6,529,487)		(6,529,487)
Balance at December 31, 2023	200	$	1	1,518,717	$	152	$	229,960,346	$	240,171	$	(210,109,353)	$	20,091,317

 The accompanying notes are an integral part of these financial statements.

F-5

NeuroMetrix, Inc.

Statements of Cash Flows

	Years Ended December 31,
	2023		2022
Cash flows for operating activities:
Net loss	$	(6,529,487)	$	(4,416,609)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	55,712		49,391
Stock-based compensation	699,505		477,062
Inventory provision charged to cost of revenue	63,420		356,700
Loss on disposal of fixed assets	—		6,875
Amortization of premiums and discounts on securities	(135,293)		(76,190)
Realized gain on available-for-sale securities	(364,929)		—
Settlement of compensation obligation	—		26,019
Changes in operating assets and liabilities:
Accounts receivable	127,947		(335,953)
Inventories	(7,861)		(1,265,134)
Prepaid expenses and other current and long-term assets	(188,109)		(181,805)
Accounts payable	(152,573)		84,046
Accrued expenses and compensation	346,800		(13,818)
Net cash used in operating activities	(6,084,868)		(5,289,416)
Cash flows for investing activities:
Purchases of available-for-sale securities	(29,755,105)		—
Purchases of held-to-maturity securities	—		(40,933,126)
Proceeds from maturities of available-for-sale securities	14,095,000		—
Proceeds from maturities of held-to-maturity securities	17,000,000		24,144,609
Purchases of fixed assets	(183,542)		(23,182)
Net cash provided by (used in) investing activities	1,156,353		(16,811,699)
Cash flows from financing activities:
Net proceeds from issuance of common stock	2,325,441		3,864,031
Net cash provided by financing activities	2,325,441		3,864,031
Net decrease in cash and cash equivalents	(2,603,074)		(18,237,084)
Cash and cash equivalents, beginning of year	4,335,020		22,572,104
Cash and cash equivalents, end of year	$	1,731,946	$	4,335,020
Supplemental disclosure of non-cash financing activity:
Common stock issued to settle employee incentive compensation obligations	$	—	$	189,398

The accompanying notes are an integral part of these financial statements.

F-6

NeuroMetrix, Inc. 

Notes to Financial Statements

1. Description of Business and Basis of Presentation

NeuroMetrix, Inc. (the "Company" or "NeuroMetrix") develops and commercializes health care products that utilize non-invasive neurostimulation. Revenues are derived from the sale of medical devices and after-market consumable products and accessories. The Company’s products are sold in the United States and select overseas markets. They are cleared by the U.S. Food and Drug Administration ("FDA") and regulators in foreign jurisdictions where appropriate. The Company has two primary products. DPNCheck® is a point-of-care test for diabetic peripheral neuropathy, which is the most common long-term complication of Type 2 diabetes. Quell is an app-enabled, wearable device for lower extremity chronic pain and for the symptoms of fibromyalgia.

The Company held cash, cash equivalents and investment grade securities totaling $18.0 million on December 31, 2023. The Company believes that its present balance of cash resources and securities coupled with cash inflows from product sales will enable the Company to fund its operations for at least the next twelve months from the date of issuance of the financial statements. Actual cash requirements could differ from management's projections for many reasons, including changes the Company may make to its business strategy, commercial challenges, regulatory developments, changes to research and development programs, supply chain issues, staffing challenges and other items affecting the Company's projected uses of cash.

F-7

NeuroMetrix, Inc. 

Notes to Financial Statements

2. Summary of Significant Accounting Policies

Use of Estimates and Assumptions

The preparation of financial statements in conformity with United States generally accepted accounting principles requires management to make significant estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during reporting periods. Actual results could differ from those estimates.

The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances and regularly assesses these estimates, but actual results could differ materially from these estimates. Effects of changes in estimates are recorded in the period in which they occur.

Cash and Cash Equivalents

Cash and cash equivalents include bank demand deposits and money market funds that invest primarily in U.S. government securities.

Securities

The Company invests in highly liquid, marketable debt securities with high credit ratings and typically with maturities of two years or less. Individual securities are designated by the Company as either "held-to-maturity" ("HTM") or “available-for-sale” ("AFS") at the point of investment. Securities classified as short-term have maturities of less than one year. As of December 31, 2023, all marketable securities held by the Company are classified as available for sale and had remaining contractual maturities of one year or less.

HTM securities are valued on an amortized cost basis and reviewed to determine if an allowance for credit losses should be recorded in the statements of operations. AFS securities are valued at fair value. Unrealized gains and losses on AFS securities are included as a component of accumulated other comprehensive income in the balance sheets and statements of stockholders’ equity and a component of total comprehensive loss in the statements of comprehensive loss. An AFS security is impaired if its fair value is less than amortized cost. Unrealized losses are evaluated to determine if the impairment is credit-related or non credit-related. Credit-related impairment is recognized as an allowance on the balance sheet with a corresponding adjustment to earnings, and a non credit-related impairment is recognized in other comprehensive loss. For certain types of securities, such as U.S. Treasuries, the Company generally expects zero credit losses. No allowance for credit losses was recorded on its securities portfolio for the years ended December 31, 2023 and 2022.

Concentrations of Credit Risk

Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash equivalents, trade receivables, and securities. The Company invests its cash equivalents and securities in highly rated institutions.

At December 31, 2023 and 2022, three customers accounted for 74% and two customers accounted for 31% of accounts receivable, respectively. Two customers accounted for 34% of revenues for the year ended December 31, 2023 and one customer accounted for 32% of revenues, for the year ended December 31, 2022.

Inventories

Inventories, consisting primarily of finished goods and purchased components, are stated at the lower of cost or net realizable value. Cost is determined using the first-in, first-out method. The net realizable value of inventories is based upon the types and levels of inventories held, forecasted demand, pricing, competition, and changes in technology. Deterioration in market and economic conditions could adversely affect the recovery of inventory value.

F-8

NeuroMetrix, Inc. 

Notes to Financial Statements

Leases

The Company presents the lease obligations on the balance sheet, by recording a right-of-use asset and a lease liability for all leases other than those that, at lease commencement, have a lease term of 12 months or less. On the lease commencement date, the Company measures and records a lease liability equal to the present value of the remaining lease payments, discounted using the rate implicit in the lease or if that cannot be readily determined, the Company's incremental borrowing rate.

Fair Value

The Company follows the provisions of Financial Accounting Standards Board (the "FASB") Accounting Standards Codification ("ASC") Topic 820-10, Fair Value Measurements and Disclosures ("ASC 820-10"), which defines fair value, establishes a framework for measuring fair value in GAAP and requires certain disclosures about fair value measurements. Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability.

As a basis for considering such assumptions, ASC 820-10 established a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows: Level 1 observable inputs such as quoted prices in active markets; Level 2 inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3 unobservable inputs for which there are little or no market data, which require the Company to develop its own assumptions. The hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value.

Note 5 presents the Company's financial assets or liabilities measured at fair value as of December 31, 2023 and 2022. The carrying amounts of the Company’s cash equivalents, accounts receivable, accounts payable, and accrued expenses approximate their fair value at December 31, 2023 and 2022 due to their short-term nature.

Revenue Recognition

Revenues include product sales, net of estimated returns. Revenue is measured as the amount of consideration the Company expects to receive in exchange for product transferred. Revenue is recognized at the point in time when contractual performance obligations have been satisfied and control of the product has been transferred to the customer. The Company has a single product delivery performance obligation. Accrued product returns using the most likely amount method are estimated based on historical data and evaluation of current information and variable consideration is not constrained. Revenue from product sales that occur via an online pharmacy agent are recognized on a gross basis and the related fulfillment fees are expensed within cost of revenues.

Accounts Receivable

Accounts receivable are recorded in the amount the Company expects to collect, net of the allowance for doubtful accounts receivable. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses based on customer past payment history, product usage activity, and recent communications with the customer. Individual customer balances which are over 90 days past due are reviewed individually for collectability and written-off when recovery is not probable. The Company does not have any off-balance sheet credit exposure related to its customers. Allowance for doubtful accounts was $25,000 as of December 31, 2023 and December 31, 2022. 

F-9

NeuroMetrix, Inc. 

Notes to Financial Statements

Income Taxes

The Company records income taxes using the asset and liability method. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective income tax bases, and operating loss and tax credit carryforwards. The Company’s financial statements contain certain deferred tax assets, which have arisen primarily as a result of operating losses, as well as other temporary differences between financial and tax accounting. In accordance with the provisions of the Income Taxes topic of the Codification, the Company is required to establish a valuation allowance if the likelihood of realization of the deferred tax assets is reduced based on an evaluation of objective verifiable evidence. Management judgment is required in determining the Company’s provision for income taxes, the Company’s deferred tax assets and liabilities and any valuation allowance recorded against those net deferred tax assets. The Company evaluates the weight of all available evidence to determine whether it is more likely than not that some portion or all of the net deferred income tax assets will not be realized.

Utilization of the net operating loss carryforwards (“NOL”) and research and development credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations that have occurred previously or that could occur in the future, as provided by Section 382 of the Internal Revenue Code of 1986, as well as similar state provisions. Ownership changes may limit the amount of NOL and tax credit carryforwards that can be utilized to offset future taxable income and tax, respectively. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of certain shareholders or public groups in the stock of a corporation by more than 50 percentage points over a three-year period. If the Company has experienced a change of control, utilization of its NOL or tax credits carryforwards would be subject to an annual limitation under Section 382. Any limitation may result in expiration of a portion of the NOL or research and development credit carryforwards before utilization. Subsequent ownership changes could further impact the limitation in future years. Further, until a study is completed and any limitation known, no amounts are being presented due to an uncertain tax position. A full valuation allowance has been provided against the Company’s NOL carryforwards and research and development credit carryforwards and, if an adjustment is required, this adjustment would be offset by an adjustment to the valuation allowance. Thus, there would be no impact to the balance sheet or statement of operations if an adjustment were required.

A two-step evaluation of all tax positions was performed, ensuring that these tax return positions meet the “more likely than not” recognition threshold and can be measured with sufficient precision to determine the benefit recognized in the financial statements. These evaluations provide the Company with a comprehensive model for how it should recognize, measure, present, and disclose in its financial statements certain tax positions that it has taken or expects to take on income tax returns.

Research and Development

Costs incurred in research and development are expensed as incurred. Included in research and development costs are wages, benefits, product design consulting, and other operating costs such as facilities, supplies, electronic components and overhead directly related to research and development efforts.

Product Warranty Costs

Product warranty costs are estimated based on historical experience, product failure rates, repair volume and labor costs. Warranty costs are accrued at the time of sale within cost of revenue and periodically reviewed in the aggregate. The liabilities for product warranty costs of $9,400 and $16,700 at December 31, 2023 and 2022, respectively, are included in accrued expenses and compensation in the accompanying balance sheets.

Fixed Assets and Long-Lived Assets

Fixed assets are recorded at cost and depreciated using the straight-line method over the estimated useful life of each asset. Expenditures for repairs and maintenance are charged to expense as incurred. On disposal, the related assets and accumulated depreciation are eliminated from the accounts and any resulting gain or loss is included in the Company’s statement of operations. Leasehold improvements are amortized over the shorter of the estimated useful life of the improvement or the remaining term of the lease.

F-10

NeuroMetrix, Inc. 

Notes to Financial Statements

The Company periodically evaluates the recoverability of its fixed assets and other long-lived assets which may result in an adjustment of estimated depreciable lives or asset impairment. When indicators of impairment are present, the carrying values of the asset are evaluated in relation to the assets operating performance and future undiscounted cash flows of the underlying assets. If an impairment is indicated, the asset carrying value is reduced to fair value based on market value estimates and assumptions concerning the amount and timing of future cash flows and discount rates.

Accounting for Stock-Based Compensation

Stock-based compensation cost is recognized ratably over the service period. The Company uses the Black-Scholes option pricing model for determining the fair value of stock options and amortizes stock-based compensation expense using the straight-line method. The Black-Scholes model requires assumptions regarding expected share price volatility, expected life of options, expected annual dividend yield, and risk-free interest rate (See Note 3 — Stock-Based Compensation).

Net Loss per Share of Common Stock

Basic and dilutive net loss per share of common stock were as follows:

	Years Ended December 31,
	2023		2022
Net loss applicable to common stockholders	$	(6,529,487)	$	(4,416,609)
Weighted average number of shares of common stock outstanding, basic and dilutive	1,041,991		889,540
Net loss per share of common stock applicable to common stockholders, basic and diluted	$	(6.27)	$	(4.97)

Shares underlying the following securities were excluded from the calculation of diluted net loss per share of common stock because their effect was anti-dilutive for each of the periods presented:

	Years Ended December 31,
	2023	2022
Options	64,659	65,683
Unvested restricted stock awards	6,222	12,031
Unvested restricted stock units	60,492	24,341
Convertible preferred stock	8	8
Total	131,381	102,063

Advertising and Promotional Costs

Advertising and promotional costs are expensed as incurred. Advertising and promotion expense were $132,806 and $268,703, in 2023 and 2022, respectively.

Accumulated Other Comprehensive Items

As of December 31, 2023, the Company had accumulated other comprehensive income of $240,171 for net unrealized gains on AFS securities, in addition to net loss in the statement of operations. As of December 31, 2022, the Company had no components of accumulated other comprehensive income or loss other than net loss.

Segments

The Company operates in a single segment covering the sale of medical equipment and consumables. The majority of the Company’s assets, revenues, and expenses for 2023 and 2022 were located in or derived from operations in the United States. Revenues from sales outside the United States accounted for approximately 20% and 14% of total revenues in 2023 and 2022, respectively.

F-11

NeuroMetrix, Inc. 

Notes to Financial Statements

Risks and Uncertainties

The Company is subject to risks common to companies in the medical device industry, including, but not limited to, environmental risk such as the COVID-19 pandemic, development by the Company or its competitors of new technological innovations, cybersecurity risk, dependence on key personnel, customers’ reimbursement from third-party payers, protection of proprietary technology, and compliance with regulations of the U.S Food and Drug Administration, Federal Trade Commission and other governmental agencies.

The Company relies on in-house assembly and third-party manufacturers to manufacture the major portion of its current products and product components. The disruption or termination of the supply of these products or a significant increase in the cost of these products from these sources could have an adverse effect on the Company's business, financial position, and result of operations.

Prior period reclassifications

We have reclassified certain amounts in prior periods to conform with current presentation. Money market funds in the amount of $81,751 which were reported within held-to-maturity securities at December 31, 2022 have been reclassified into cash and cash equivalents.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB") and are adopted by us as of the specified effective date. Unless otherwise discussed, we believe that the impact of recently adopted and recently issued accounting pronouncements will not have a material impact on our balance sheets, results of operations and cash flows.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments. The guidance in ASU 2016-13 replaces the incurred loss impairment methodology under current GAAP. The new impairment requires immediate recognition of estimated credit losses expected to occur for most financial assets and certain other instruments. It applies to all entities. For trade receivables, loans and HTM debt securities, entities are required to estimate lifetime expected credit losses. Trading and AFS debt securities are required to be recorded at fair value. SEC small reporting companies were required to adopt this new guidance in fiscal years beginning on or after December 15, 2022. The Company adopted this guidance on a prospective basis as of January 1, 2023, and it had no material impact on the financial statements.

In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures, which requires public entities, on an annual basis, to provide disclosures of specific categories in the rate reconciliation, additional information for reconciling items that meet a quantitative threshold and income taxes paid disaggregated by jurisdiction. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of this standard on the Company’s Financial Statements and disclosures.

3. Stock-Based Compensation

The Company's 2022 Equity Incentive Plan (the "Stock Plan") provides for granting of incentive and nonqualified stock option and stock bonus awards to officers, employees and outside consultants. Outstanding options under the Stock Plan generally vest over four years and terminate 10 years after the grant date, or earlier if the option holder is no longer an executive officer, employee, consultant, advisor or director of the Company. As of December 31, 2023, 203,643 shares of common stock were authorized for issuance under the Stock Plan, of which 41,583 shares had been issued, 6,222 restricted stock awards and 60,492 restricted stock units remain unvested, 64,659 shares were subject to outstanding options at a weighted average exercise price of $25.73 per share and 26,520 shares were available for future grant.

F-12

NeuroMetrix, Inc. 

Notes to Financial Statements

3. Stock-Based Compensation - (continued)

The Company's 2009 Non-Qualified Inducement Stock Plan (the “Inducement Plan”) is intended to encourage employees, including prospective employees, upon whose efforts the Company depends for the successful conduct of its business, to acquire an equity interest in the Company. The Inducement Plan provides for the granting of awards, including non-qualified stock options, restricted stock, and unrestricted stock. As of December 31, 2023, 156.25 shares of common stock were authorized for issuance and were available for future grant under the Inducement Plan.

The exercise price of stock options awarded under the Stock Plan and the Inducement Plan may not be less than the fair value of the common stock on the date of the option grant. For holders of more than 10% of the Company’s total combined voting power of all classes of stock, incentive stock options may not be granted at less than 110% of the fair value of the Company’s common stock and for a term not to exceed five years.

The Company's 2010 Employee Stock Purchase Plan (the "ESPP"), amended and restated in 2021 to increase stock purchase capacity, authorizes an annual increase on the first day of each of the Company’s fiscal years equal to the lesser of (i) 6,250 shares, (ii) 1 percent of the shares of common stock outstanding on the last day of the immediately preceding fiscal year, or (iii) such lesser number of shares as is determined by the Board. All full-time employees and certain part-time employees are eligible to participate in the ESPP. For part-time employees to be eligible, they must have customary employment of more than five months in any calendar year and more than 20 hours per week. Employees who, after exercising their rights to purchase shares under the ESPP, would own shares representing 5% or more of the voting power of the Company’s common stock, are ineligible to participate.

Under the ESPP, participating employees can authorize the Company to withhold up to 10% of their earnings during consecutive six-month payment periods for the purchase of the shares. At the conclusion of each period, participating employees can purchase shares at 85% of the lower of their fair value at the beginning or end of the period. The ESPP is regarded as a compensatory plan. For the years ended December 31, 2023 and 2022, the Company issued 4,902 and 2,526 shares of its common stock, respectively, under the ESPP. As of December 31, 2023, there were 22,089 remaining shares to be issued under the ESPP.

The Company uses the Black-Scholes option pricing model for determining the fair value of shares of common stock issued or to be issued under the ESPP. The following assumptions were used in determining fair value: The risk-free interest rate assumption is based on the United States Treasury’s constant maturity rate for a six month term (corresponding to the expected option term) on the date the option was granted. The expected dividend yield is zero as the Company does not currently pay dividends nor expects to do so during the expected option term. An expected term of six months is used based on the duration of each plan offering period. The volatility assumption is based on daily historical volatility during the time period that corresponds to the expected option term and expected future stock price volatility.

F-13

NeuroMetrix, Inc. 

Notes to Financial Statements

3. Stock-Based Compensation - (continued)

There were no new issuance of stock options in 2023. The assumptions that the Company used in the Black-Scholes pricing model to determine the fair value of the stock options used in the calculation of stock-based compensation expense for the year ended December 31, 2022 were as follows:

	Years Ended December 31,
		2022
Risk-free interest rate		1.8%	—%	3.7%
Expected dividend yield		—
Expected option term		5 years
Volatility		70.0%

A summary of option activity for the year ended December 31, 2023 is presented below:

	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value
Outstanding at December 31, 2022	65,662	$	26.15
Granted	—	—
Exercised	—	—
Forfeited	(1,000)	40.21
Expired	(3)	4,224.00
Outstanding at December 31, 2023	64,659	$	25.73	6.8	$	—
Vested or expected to vest at December 31, 2023	61,773	$	25.74	6.8	$	—
Exercisable at December 31, 2023	61,773	$	25.74	6.8	$	—

Expected to vest options are determined by applying the estimated forfeiture rate to the total outstanding options. Aggregate intrinsic value represents the total pre-tax intrinsic value (the aggregate difference between the closing stock price of the Company’s common stock as of December 31, 2023, as applicable, and the exercise price for the in-the-money options) that would have been received by the option holders if all the in-the-money options had been exercised on December 31, 2023.

The weighted average per share grant-date fair values of options granted during 2023 and 2022 was zero and $30.72, respectively.

The aggregate intrinsic value of options issued or exercised during 2023 and 2022 was zero.

Total unrecognized stock-based compensation costs related to non-vested stock options was $36,885, which related to 5,500 shares with a per share weighted fair value of $25.40 as of December 31, 2023. This unrecognized cost is expected to be recognized over a weighted average period of approximately 1.7 years.

During 2023 and 2022, certain employees and directors have been granted restricted stock awards and restricted stock units that are service based. The fair value of the restricted stock awards and units are calculated based on the closing price of common stock on the date of issuance.

During 2023, 51,210 restricted stock units were granted to employees and members of the Board of Directors that vest at different times during the years 2023 through 2026. Included therein were grants to the members of the Board of Directors, 21,584 restricted stock units in May 2023, that cliff vest in one year from issuance and 29,626 restricted stock units to employees that vest quarterly at different times during the years 2023 through 2026. During 2022, 12,000 restricted stock awards and 27,655 restricted stock units were granted to employees and members of the Board of Directors that vest at different times during the years 2022 through 2025. Included therein were grants to the members of the Board of Directors of 6,616

F-14

NeuroMetrix, Inc. 

Notes to Financial Statements

3. Stock-Based Compensation - (continued)

restricted stock units in May 2022, that cliff vest in one year from issuance, 3,434 restricted stock units in July 2022 to a new member of the Board of Directors that vest quarterly over a two year period and 12,000 restricted stock awards and 17,605 restricted stock units to employees that vest quarterly at different times during the years 2022 through 2025.

A summary of restricted stock activity for the year ended December 31, 2023 is presented below:

	Restricted Stock Awards	Weighted Average Grant Date Fair Value		Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested at December 31, 2022	12,032	$	43.44	24,341	$	27.20
Granted	—	$	—	51,210	$	7.45
Vested	(5,094)	$	44.98	(14,535)	$	26.64
Forfeited	(716)	$	34.23	(524)	$	28.41
Unvested at December 31, 2023	6,222	$	43.28	60,492	$	15.10

The Company recorded stock-based compensation expense of $699,505 and $477,062 for 2023 and 2022, respectively.

Total compensation cost related to non-vested awards not yet recognized at December 31, 2023 was $698,854. These unrecognized costs are expected to be recognized over a weighted-average period of 1.4 years.

4. Securities

The Company's marketable debt securities are classified as either AFS or HTM pursuant to ASC 320 - Investments - Debt Securities. The following table summarizes the valuations and unrealized gains and losses of AFS securities which are recorded at estimated fair value as of December 31, 2023. The Company held no AFS securities as of December 31, 2022.

	December 31, 2023
			Gross Unrealized
Available-for-sale securities	Cost		Gains		Losses		Credit Losses		Estimated Fair Value
U.S. government bonds	$	4,412,935	$	5,665	$	—	$	—	$	4,418,600
Commercial paper	11,612,099		234,506		—		—		11,846,605
Total	$	16,025,034	$	240,171	$	—	$	—	$	16,265,205

HTM securities are valued at amortized cost. The Company held no HTM securities as of December 31, 2023. The following tables summarize the valuations of HTM securities as of December 31, 2022.

	December 31, 2022
Held-to-maturity securities	Amortized Cost		Credit Losses		Estimated Fair Value
U.S. government bonds	$	3,457,651	$	—	$	3,456,580
Corporate bonds	4,011,569		—		3,950,380
Commercial paper	9,395,487		—		9,387,914
Total	$	16,864,707	$	—	$	16,794,874

The Company evaluates all HTM and AFS securities for impairment at each reporting period. It determined that changes in the fair value of its securities at December 31, 2023 resulted primarily from interest rate fluctuations subsequent to the purchase date of the securities. There was no deterioration in the credit worthiness of the issuers and no credit losses were recorded as of December 31, 2023.

F-15

5.     Fair Value Measurements

The following tables set forth the Company’s financial instruments that were measured at fair value:

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	1,284,290	$	1,284,290	$	—	$	—
U.S. government bonds	$	4,418,600	$	4,418,600	$	—	$	—
Commercial paper	$	11,846,605	$	—	$	11,846,605	$	—
Total	$	17,549,495	$	5,702,890	$	11,846,605	$	—

	December 31, 2022
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	1,551,027	$	1,551,027	$	—	$	—
Total	$	1,551,027	$	1,551,027	$	—	$	—

The Company's accounts receivable, accounts payable, and accrued expenses are valued at cost which approximates fair value.

6. Inventories

Inventories consist of the following:

	December 31,
	2023		2022
Purchased components	$	1,151,381	$	982,129
Finished goods	408,047		632,858
	$	1,559,428	$	1,614,987

The Company recorded a charge of $63,420 and $356,700 to cost of revenues in 2023 and 2022, respectively, for Quell inventory to reduce the carrying value to net realizable value.

F-16

NeuroMetrix, Inc. 

Notes to Financial Statements

7. Fixed Assets

Fixed assets consist of the following:

	Estimated Useful Life (Years)	December 31,
		2023		2022
Computer and laboratory equipment	3	$	629,970	$	459,218
Furniture and equipment	3	33,104		33,104
Production equipment	7	296,180		296,180
Leasehold improvements	*	70,918		58,128
		1,030,172		846,630
Less – accumulated depreciation		(736,723)		(681,011)
		$	293,449	$	165,619

*Lesser of life of lease or estimated useful life.

Depreciation expense was $55,712 and $49,391 for 2023 and 2022, respectively. During 2022, the Company wrote off fully depreciated fixed assets no longer in service with a cost basis and accumulated depreciation of $674,520. It also disposed of assets with a cost basis of $6,875 and recognized a loss in this amount.

8. Accrued Expenses and Compensation

Accrued expenses and compensation consist of the following:

	December 31,
	2023		2022
Professional services	$	298,534	$	155,000
Compensation	346,245		249,224
Warranty	9,400		16,700
Clinical	39,000		—
Sales tax	141,672		131,621
Other	41,888		37,394
	$	876,739	$	589,939

9. Income Taxes

Current income tax expense (benefit) attributable to continuing operations was zero for the years ended December 31, 2023 and 2022.

F-17

NeuroMetrix, Inc. 

Notes to Financial Statements

The Company’s effective income tax rate differs from the statutory federal income tax rate as follows for the years ended December 31, 2023 and 2022.

	December 31,
	2023		2022
Federal statutory rate	(21.0)	%	(21.0)	%
State tax provision, net of federal provision	(1.0)		(4.9)
Permanent items	0.1		0.1
Federal research and development credits	(2.0)		(3.3)
382 Limitation - NOL and tax credits	—		(17.4)
Valuation allowance	23.9		46.5
Effective income tax rate	—		—

The Company’s deferred tax assets consist of the following:

	December 31,
	2023		2022
Deferred tax assets:
Net operating loss carryforwards	$	4,289,409	$	3,369,688
Research and development credit carryforwards	544,415		310,000
Accrued expenses	44,497		74,459
Inventory reserve	97,378		88,983
Stock-based compensation	311,039		323,337
Lease liability	56,481		87,872
Capitalized R&D	1,131,902		719,888
Other	1,596		—
Total gross deferred tax assets	6,476,717		4,974,227
Valuation allowance	(6,418,062)		(4,868,469)
Deferred tax liabilities:
Right of use asset	$	(58,655)	$	(91,502)
Other	$	—	$	(14,256)
Net deferred tax assets	$	—	$	—

At December 31, 2023, the Company had federal NOLs of approximately $135.7 million, of which $121.1 million began to expire in 2022 and $14.5 million have an indefinite carryforward. At December 31, 2023, the Company had state NOLs of $57.6 million, some of which have an indefinite carryforward, and others that begin to expire in 2025. At December 31, 2023, the Company has federal and state tax credits of approximately $1.8 million and $0.9 million, respectively, which may be available to reduce future taxable income and related taxes thereon. These amounts include tax benefits of approximately $2.4 million and $75,000 attributable to NOL and tax credit carryforwards, respectively, that result from the exercise of employee stock options. The Company experienced an ownership change in 2019 as defined under Internal Revenue Service Regulations, which significantly reduced the tax benefits associated with these carryforwards under Internal Revenue Code Sections 382 and 383. The federal and state research and development credits each began to expire in 2022.

In accordance with the provisions of the Income Taxes topic of the Codification, the Company has evaluated the positive and negative evidence bearing upon the realizability of its deferred tax assets, which are comprised principally of net operating losses. Management has determined that it is more likely than not that the Company will not recognize the benefits of federal and state deferred tax assets and, as a result, a valuation allowance of approximately $6.4 million and $4.9 million has been established at December 31, 2023 and 2022, respectively. The Company experienced a change in control during 2019. Accordingly, utilization of their respective consolidated and/ or separately computed NOL's and/ or tax credit carryforwards is subject to an annual limitation for federal tax purposes under Internal Revenue Code Sections 382 and 383. Due to this change

F-18

NeuroMetrix, Inc. 

Notes to Financial Statements

in control, the Company estimates that approximately $123,800,000 of federal NOL's and/or tax credit carryforwards are effectively eliminated according to the Internal Revenue Code Sections 382 and 383 limitations. A large portion of state NOLs and/ or tax credit carry forwards are also eliminated. The Company has not recorded any amounts for unrecognized tax benefits as of December 31, 2023 or 2022. The Company files tax returns as prescribed by the tax laws of the jurisdictions in which it operates. In the normal course of business, the Company is subject to examination by federal and state jurisdictions, where applicable. There are currently no pending income tax examinations. The Company’s tax years are still open under statute from December 31, 2020 to the present. Earlier years may be examined to the extent that tax credit or net operating loss carryforwards are used in future periods. The Company’s policy is to record interest and penalties related to income taxes as part of its income tax provision.

10. Commitments and Contingencies

Operating Leases

The Company's lease on its Woburn, Massachusetts corporate office and manufacturing facilities (the “Woburn Lease”) extends through September 2025 at a monthly base rent of $13,846 and with a 5-year extension option. The Company's lease on its former corporate office in Waltham, Massachusetts (the "Waltham lease") ended in February 2022. During the years ended December 31, 2023 and 2022 the Company recorded sublet income on the Waltham lease totaling zero and $22,795, respectively within operating expenses on the Company's Statement of Operations.

The following is a maturity analysis of the annual cash flows of the operating lease liabilities as of December 31, 2023:

2024	$	165,785
2025	117,431
Total minimum lease payments	$	283,216
Discount rate, 15.0%	$	42,340
Lease obligation, current portion	148,391
Lease obligation, net of current portion	92,485
	$	283,216

Total recorded rent expense net of sublet income was $197,310 and $163,061, for 2023 and 2022, respectively. The Company records rent expense on its facility leases on a straight-line basis over the lease term. The remaining operating lease term was 1.7 years as of December 31, 2023.

Contingencies

The Company is not party to or aware of any legal proceedings.

F-19

NeuroMetrix, Inc. 

Notes to Financial Statements

11. Retirement Plan

The Company maintains a 401(k) defined contribution savings plan for its employees who meet certain service period and age requirements. Contributions are permitted up to the maximum allowed under the Internal Revenue Code of each covered employee’s salary. The savings plan permits the Company to contribute at its discretion. In 2023 and 2022 the Company made no contributions to the plan.

12. Stockholders’ Equity

Preferred stock and convertible preferred stock consist of the following:

	December 31,
	2023		2022
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2023 and 2022; no shares issued and outstanding at December 31, 2023 and 2022	$	—	$	—
Series B convertible preferred stock, $0.001 par value, 147,000 shares designated at December 31, 2023 and 2022, and 200 shares issued and outstanding at December 31, 2023 and 2022, respectively	1		1

Preferred stock activity

As of December 31, 2023, 200 shares of Series B convertible preferred stock remained outstanding. The shares of Series B convertible preferred stock are convertible into the equivalent of 8 shares of common stock at the option of the holder.

Other equity activity

During 2022, the Company issued in settlement of management incentive compensation 6,276 shares of fully vested common stock with a value of $215,417.

During 2023 and 2022, respectively, the Company issued pursuant to its ATM Agreement 537,094 shares of common stock, net of fees totaling $142,795 for proceeds of $2,305,753 and 114,542 shares of its common stock, net of fees totaling $175,355 for proceeds of $3,833,772.

During 2023 and 2022, respectively, the Company issued 4,902 shares of fully vested common stock with a value of $19,688 and 2,526 shares of fully vested common stock with a value of $30,259 pursuant to the Company's 2010 Employee Stock Purchase Plan, respectively.

As of December 31, 2023 and 2022, the Company had 25,000,000 shares of common stock authorized and 1,524,939, and 971,492 shares issued and outstanding, respectively. Each share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders. Common stockholders are not entitled to receive dividends unless declared by the Board of Directors.

At December 31, 2023, the Company has reserved authorized shares of common stock for future issuance as follows:

Outstanding stock options	64,659
Convertible preferred stock	8
Unvested restricted stock units	60,492
Possible future issuance under inducement plan	156
Possible future issuance under stock option plans	26,520
Possible future issuance under employee stock purchase plan	22,089
Total	173,924

Subsequently from January 1, 2024 to February 29, 2024, the Company issued 458,380 shares of common stock under its ATM program net of fees totaling $46,995 for proceeds of $1,519,099.

F-20

NeuroMetrix, Inc. 

Notes to Financial Statements

13. Management Retention and Incentive Plan

Under the Company’s Management Retention and Incentive Plan (the “Plan”), a portion of the consideration payable upon a change in control transaction, as defined in the Plan and its amendments, would be paid in cash to certain executive officers and key employees and recorded as compensation expense within the Statement of Operations during the period in which the change of control transaction occurs.

14. Reverse Stock Split

On November 21, 2023, the Company effected a 1-for-8 reverse stock split of its Common Stock, (the "Reverse Stock Split"). The par value and other terms of the common stock were not affected by the Reverse Stock Split. The Company’s shares outstanding immediately prior to the split totaled 8,733,398, which were subsequently adjusted to 1,091,648 shares outstanding. No fractional shares were issued in connection with the reverse stock split. Stockholders who otherwise would be entitled to receive fractional shares were received payment in cash in lieu of any such resulting fractional shares of common stock as the post-reverse split amounts of common stock were rounded down to the nearest full share. Share, per share, and stock option amounts for all periods presented within the financial statements contained in the Annual Report on Form 10-K have been retroactively adjusted to reflect the Reverse Stock Split.

F-21

NeuroMetrix, Inc. 

Schedule II — Valuation and Qualifying Accounts

Description	Balance at Beginning of Period		Charged to costs and expenses		Charged to other accounts		Recoveries/ (Deductions)			Balance at End of Period
December 31, 2023
Allowance for Doubtful Accounts	$	25,000	$	—	$	—	$	—		$	25,000
Deferred Tax Asset Valuation Allowance	4,868,469		1,946,667		—		(397,074)		(1)	6,418,062
Accrued Product Returns	1,000		—		—		(1,000)			—
Warranty Reserve	16,700		—		—		(7,300)			9,400
December 31, 2022
Allowance for Doubtful Accounts	$	25,000	$	—	$	—	$	—		$	25,000
Deferred Tax Asset Valuation Allowance	2,827,759		2,187,921		—		(147,211)		(1)	4,868,469
Accrued Product Returns	39,000		—		—		(38,000)			1,000
Warranty Reserve	28,400		—		—		(11,700)			16,700

(1)Expiration of Federal and State Net Operating Loss Carryforwards and other reductions.

S-1

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-118059, 333-135242, 333-151195, 333-159712, 333-159713, 333-167180, 333-173769, 333-183071, 333-186827, 333-189393, 333-190177, 333-197407, 333-205827, 333-211379, 333-218431, 333-226245, 333-236105, 333-256489, 333-265080 and 333-273478) and on Form S-3 (Nos. 333-150087, 333-162303, 333-189392, 333-197405, 333-199359, 333-208923, 333-211919, 333-215792, 333-219783 and 333-260438) of our report dated March 1, 2024 relating to the financial statements and schedule of NeuroMetrix, Inc. (the “Company”), as of and for the years ended December 31, 2023 and 2022, which appears in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.

/s/ Baker Tilly US, LLP

Tewksbury, Massachusetts
March 1, 2024

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Shai N. Gozani, certify that:

1.I have reviewed this Annual Report on Form 10-K of NeuroMetrix, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: March 1, 2024	/s/ SHAI N. GOZANI, M.D., PH.D.
	Shai N. Gozani, M.D., Ph.D. Chairman, President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Thomas T. Higgins, certify that:

1.I have reviewed this Annual Report on Form 10-K of NeuroMetrix, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: March 1, 2024	/s/ THOMAS T. HIGGINS
	Thomas T. Higgins Senior Vice President, Chief Financial Officer and Treasurer

EX-32

Exhibit 32

CERTIFICATION

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United States Code), each of the undersigned officers of NeuroMetrix, Inc., a Delaware corporation (the "Company"), does hereby certify, to such officer's knowledge, that:

The Annual Report for the year ended December 31, 2023 (the "Form 10-K") of the Company fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 1, 2024	/s/ SHAI N. GOZANI, M.D., PH.D.
	Shai N. Gozani, M.D., Ph.D. Chairman, President and Chief Executive Officer

Date: March 1, 2024	/s/ THOMAS T. HIGGINS
	Thomas T. Higgins Senior Vice President, Chief Financial Officer and Treasurer

EX-97

NeuroMetrix, Inc.

Compensation Clawback Policy

Adopted October 23, 2023

Purpose

The Board of Directors (the “Board”) of NeuroMetrix, Inc. (the “Corporation”) believes that it is in the best interest of the Corporation and its shareholders to maintain a culture that emphasizes integrity and accountability and that reinforces the Corporation’s compensation philosophy. The Board has therefore adopted this compensation clawback policy (the “Policy”) which provides for the recoupment of incentive-based compensation in the event of an accounting restatement. This Policy is intended to comply with Section 10D of the Securities Exchange Act of 1934 (the “Act”), the rules promulgated thereunder by the Securities and Exchange Commission, and the listing standards of Nasdaq (the “Applicable Rules”), and will be interpreted consistent therewith.

Applicability and Effective Date

This Policy is effective October 23, 2023 (the “Effective Date”) and is applicable to all Incentive-Based Compensation (as defined below) received by Executive Officers (as defined below) after the Effective Date. The Policy will be administered by the Board or, if so designated by the Board, the Compensation Committee of the Board (the “Committee”), in which case references to the Board will be deemed to be references to the Committee. Any determination made by the Board under this Policy will be final and binding on all affected individuals. Each Executive Officer shall be required to execute the acknowledgement in Appendix A of this Policy as soon as practicable after the later of (i) the Effective Date and (ii) the date on which the employee is designated as an Executive Officer; provided, however, that failure to execute such acknowledgement shall have no impact on the enforceability of this Policy.

Restatement Clawback

In the event the Corporation is required to prepare an Accounting Restatement (as defined below), any Executive Officer who received Excess Compensation (as defined below) during the three (3) completed fiscal years preceding the date the Corporation is required to prepare an Accounting Restatement (the “Look-Back Period”) shall be required to repay or forfeit such Excess Compensation reasonably promptly.

Method of Repayment, Conditions for Non-Recovery

The Board shall have discretion to determine the appropriate means of recovery of Excess Compensation, which may include, without limitation, direct payment in a lump sum from the Executive Officer, recovery over time, cancellation of outstanding awards, the reduction of future pay and/or awards, and/or any other method which the Board determines is advisable to achieve reasonably prompt recovery of Excess Compensation. At the direction of the Board, the Corporation shall take all actions reasonable and appropriate to recover Excess Compensation from any applicable Executive Officer, and such Executive Officer shall be required to reimburse the Corporation for any and all expenses reasonably incurred (including legal fees) by the Corporation in recovering such Excess Compensation in accordance with this Policy.

The Board may determine that repayment of Excess Compensation (or a portion thereof) is not required only whereit determines that recovery would be impracticable and one of the following circumstances exists: (i) the direct expense paid to a third party to assist in enforcing this Policy would exceed the amount to be recovered, provided the Corporation has (A) made a reasonable attempt to recover such Incentive Compensation, (B) documented such reasonable attempt, and (C) provided such documentation to Nasdaq; (ii) recovery would violate home country law where the law was adopted prior to November 28, 2022, provided the Corporation has (A) obtained an opinion of home country counsel acceptable to Nasdaq that recovery would result in such violation and (B) provided such opinion to the Nasdaq; or (iii) recovery would likely cause an otherwise tax-qualified retirement plan, under which benefits are broadly available to employees of the Corporation, to fail to meet the requirements of 26 U.S.C. 401(a)(13) or 26 U.S.C. 411(a) and the regulations thereunder.

No Fault Application, No Indemnification

Recovery of erroneously received compensation under this Policy is on a “no fault” basis, meaning that it will occur regardless of whether the Executive Officer engaged in misconduct or was otherwise directly or indirectly responsible, in whole or in part, for the Accounting Restatement. No Executive Officer may be indemnified by the Corporation, or any of its affiliates, from losses arising from the application of this Policy.

Definitions

For purposes of this Policy, the following definitions will apply:

“Accounting Restatement” means an accounting restatement due to the material noncompliance of the Corporation with any financial reporting requirement under securities laws, including any required

accounting restatement to correct an error in previously issued financial statements that is material to the previously issued financial statements, or that corrects an error that is not material to previously issued financial statements but would result in a material misstatement if the error were corrected in the current period or left uncorrected in the current period.

Changes to financial statements that do not constitute an Accounting Restatement include retroactive: (i) application of a change from one generally accepted accounting principle to another generally accepted accounting principle; (ii) revisions to reportable segment information due to a change in internal organization; (iii) reclassification due to a discontinued operation; (iv) application of a change in reporting entity, such as from a reorganization of entities under common control; (v) adjustments to provisional amounts in connection with a prior business combination; and (vi) revisions for stock splits, reverse stock splits, stock dividends, or other changes in capital structure.

“Excess Compensation” means any amount of Incentive-Based Compensation received by an Executive Officer that exceeds the amount of Incentive-Based Compensation that otherwise would have been received had it been determined based on the Accounting Restatement, computed without regard to any taxes paid. For Incentive Compensation based on stock price or total shareholder return, where the amount to be recovered is not subject to mathematical recalculation directly from information in the Accounting Restatement, the amount to be recovered shall be based on a reasonable estimate of the effect of the Accounting Restatement on the stock price or total shareholder return, as applicable, and the Corporation shall retain documentation of the determination of such estimate and provide such documentation to Nasdaq if so required by the Applicable Rules. Incentive-Based Compensation is deemed received during the fiscal year during which the applicable financial reporting measure, stock price and/or total shareholder return measure, upon which the payment is based, is achieved, even if the grant or payment occurs after the end of such period.

“Executive Officer” means an individual who is, or was during the Look-Back Period, an executive officer of the Corporation within the meaning of Rule 10D-1(d) under the Act, as well as any other officer or employee designated as an “Executive Officer” for purposes of this Policy from time to time.

“Incentive-Based Compensation” means any compensation that is granted, earned or vested based wholly or in part on stock price, total shareholder return, and/or the attainment of (i) any financial reporting measure(s) that are determined and presented in accordance with the accounting principles using in preparing the Corporation’s financial statements and/or (ii) any other measures that are derived in whole or in part from such measures.

Compensation that does not constitute “Incentive-Based Compensation” includes equity incentive awards for which the grant is not contingent upon achieving any financial reporting measure performance goal and that vest exclusively upon completion of a specified employment period, without any performance condition, and bonus awards that are discretionary or based on subjective goals or goals unrelated to financial reporting measures.

Administration, Amendment, and Termination

This Policy will be enforced and appropriate proxy disclosures and exhibit filings will be made in accordance with the Applicable Rules and any other applicable rules and regulations of the Securities and Exchange Commission and applicable Nasdaq listing standards.

The Board shall have authority to (i) exercise all of the powers granted to it under the policy, (ii) construe, interpret, and implement this policy, and (iii) make all determinations necessary or advisable in administering this policy.

In addition, the Board may amend this policy, from time to time in its discretion, and shall amend this Policy, as it deems necessary, including to reflect changes in applicable law. The Board may terminate this Policy at any time. Any such amendment (or provision thereof) or termination shall not be effective if such amendment or termination would (after taking into account any actions taken by the Corporation contemporaneously with such amendment or termination) cause the Company to violate the Applicable Rules.

In the event of any conflict or inconsistency between this Policy and any other policies, plans, or other materials of the Corporation, this Policy will govern.

This Policy will be deemed to be automatically updated to incorporate any requirement of law, the SEC, exchange listing standard, rule or regulation applicable to the Corporation.

    - 2 -

Appendix A:

NeuroMetrix, Inc.

Compensation Clawback Policy

ACKNOWLEDGMENT

The undersigned acknowledges and agrees that the undersigned (i) is, and will be, subject to the Compensation Clawback Policy to which this acknowledgement is appended, and (ii) will abide by the terms of Compensation Clawback Policy, including by returning Excess Compensation (as defined in the Compensation Clawback Policy) pursuant to whatever method the Board determines is advisable to achieve reasonably prompt recovery of such Excess Compensation, as prescribed under the Policy.

David Van Avermaete

Print Name

/s/ David Van Avermaete

Signature

Dated: October 23, 2023

    - 3 -

XML

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 29, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Document Transition Report	false
Entity Registrant Name	NEUROMETRIX, INC.
Entity File Number	001-33351
Entity Tax Identification Number	04-3308180
Entity Address, Address Line One	4B Gill Street
Entity Address, City or Town	Woburn
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01801
City Area Code	781
Local Phone Number	890-9989
Entity Central Index Key	0001289850
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 8,183,506
Entity Common Stock, Shares Outstanding		1,986,540
ICFR Auditor Attestation Flag	false
Entity Incorporation, State or Country Code	DE
Document Annual Report	true
Entity Interactive Data Current	Yes
Document Financial Statement Error Correction [Flag]	false
Common Stock [Member]
Document Information [Line Items]
Trading Symbol	NURO
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Security Exchange Name	NASDAQ
Preferred Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights
Security Exchange Name	NASDAQ
No Trading Symbol Flag	true

XML

Audit Information	12 Months Ended
	Dec. 31, 2023
Auditor [Line Items]
Auditor Firm ID	23
Auditor Location	Tewksbury, Massachusetts
Auditor Name	Baker Tilly US, LLP

XML

Cover

12 Months Ended

Dec. 31, 2023

Cover [Abstract]

Documents Incorporated by Reference

The following documents (or parts thereof) are incorporated by reference into the following parts of this Form 10-K: Certain information required by Part III of this Annual Report on Form 10-K is incorporated from the Registrant’s Proxy Statement for the Annual Meeting of Stockholders to be held on April 30, 2024 (the 2024 Annual Meeting of Stockholders).

XML

Balance Sheets - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Assets, Current [Abstract]
Cash and Cash Equivalents, at Carrying Value	$ 1,731,946	$ 4,335,020
Debt Securities, Available-for-Sale	16,265,205	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	16,864,707
Accounts Receivable, after Allowance for Credit Loss, Current	518,824	646,771
Inventory, Net	1,559,428	1,614,987
Prepaid Expense and Other Assets, Current	779,039	645,502
Assets, Current, Total	20,854,442	24,106,987
Operating Lease, Right-of-Use Asset	250,150	370,609
Assets, Total	21,424,441	24,669,615
Other Assets, Noncurrent	26,400	26,400
Property, Plant and Equipment, Net	293,449	165,619
Liabilities, Current [Abstract]
Accounts Payable, Current	215,509	368,082
Accrued Liabilities, Current	876,739	589,939
Operating Lease, Liability, Current	148,391	148,391
Liabilities, Current, Total	1,240,639	1,106,412
Liabilities, Total	1,333,124	1,313,928
Operating Lease, Liability, Noncurrent	92,485	207,516
Commitments and Contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Additional Paid in Capital	229,960,346	226,935,456
Accumulated Other Comprehensive Income (Loss), Net of Tax	240,171	0
Retained Earnings (Accumulated Deficit)	(210,109,353)	(203,579,866)
Stockholders' Equity Attributable to Parent, Total	20,091,317	23,355,687
Liabilities and Equity, Total	$ 21,424,441	$ 24,669,615
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	25,000,000	25,000,000
Common Stock, Shares, Issued	1,524,939	971,492
Common Stock, Shares, Outstanding	1,524,939	971,492
Common Stock, Value, Issued	$ 152	$ 96
Convertible Preferred Stock [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred Stock, Value, Issued	1	1
Preferred Non-Convertible Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred Stock, Value, Issued	$ 0	$ 0

XML

Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2023	Nov. 21, 2023	Nov. 20, 2023	Dec. 31, 2022
Assets, Current [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 25,000			$ 25,000
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock, Shares, Issued	1,524,939			971,492
Common Stock, Shares, Outstanding	1,524,939	1,091,648	8,733,398	971,492
Common Stock, Shares Authorized	25,000,000			25,000,000
Common Stock, Par or Stated Value Per Share	$ 0.0001			$ 0.0001

XML

Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 5,901,425	$ 8,256,073
Cost of Revenue	1,954,012	2,505,833
Gross Profit, Total	3,947,413	5,750,240
Operating Expenses [Abstract]
Research and Development Expense	2,777,960	3,239,725
Selling and Marketing Expense	3,365,265	2,865,615
General and Administrative Expense	4,955,709	4,386,666
Operating Expenses, Total	11,098,934	10,492,006
Operating Income (Loss), Total	(7,151,521)	(4,741,766)
Net Income (Loss) Available to Common Stockholders, Basic	(6,529,487)	(4,416,609)
Net Income (Loss) Attributable to Parent, Total	$ (6,529,487)	$ (4,416,609)
Earnings Per Share, Diluted	$ (6.27)	$ (4.97)
Earnings Per Share, Basic	$ (6.27)	$ (4.97)
Investment Income, Interest	$ 257,105	$ 325,157
Other Nonoperating Income	364,929	0
Nonoperating Income (Expense)	$ 622,034	$ 325,157

XML

Statement of Comprehensive Income (Statement) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax	$ 605,100	$ 0
Other Comprehensive Income Realized Gain Adjustment	364,929	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(6,289,316)	(4,416,609)
Net Income (Loss) Attributable to Parent	$ (6,529,487)	$ (4,416,609)

XML

Statements of Changes in Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent	Convertible Preferred Stock [Member] Preferred Stock [Member]
Beginning Balance at Dec. 31, 2021	$ 23,215,786	$ 84	$ 222,378,958	$ (199,163,257)		$ 1
Beginning Balance (in shares) at Dec. 31, 2021		831,310				200
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	477,062		477,062
Stock Issued During Period, Value, New Issues	3,833,772	$ 11	3,833,761
Stock Issued During Period, Shares, New Issues		114,542
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	215,417		215,417
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		6,276
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 30,259		30,259
Issuance of common stock under employee stock purchase plan (in shares)	2,526	2,526
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ 0	$ 1	(1)
Stock Issued During Period, Shares, Restricted Stock Award, Gross		4,806
Other Comprehensive Income Realized Gain Adjustment	0
Net income (loss)	(4,416,609)			(4,416,609)
Ending Balance at Dec. 31, 2022	23,355,687	$ 96	226,935,456	(203,579,866)		$ 1
Ending Balance (in shares) at Dec. 31, 2022		959,460				200
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	699,505		699,505
Stock Issued During Period, Value, New Issues	2,305,753	$ 54	2,305,699
Stock Issued During Period, Shares, New Issues		537,094
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 19,688		19,688
Issuance of common stock under employee stock purchase plan (in shares)	4,902	4,902
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ 0	$ 2	(2)
Stock Issued During Period, Shares, Restricted Stock Award, Gross		17,261
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	605,100				$ 605,100
Other Comprehensive Income Realized Gain Adjustment	(364,929)				(364,929)
Net income (loss)	(6,529,487)			(6,529,487)
Ending Balance at Dec. 31, 2023	$ 20,091,317	$ 152	$ 229,960,346	$ (210,109,353)	$ 240,171	$ 1
Ending Balance (in shares) at Dec. 31, 2023		1,518,717				200

XML

Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	$ (2,603,074)	$ (18,237,084)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(6,529,487)	(4,416,609)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,731,946	4,335,020
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, Depletion and Amortization, Nonproduction	55,712	49,391
Share-based Payment Arrangement, Noncash Expense	699,505	477,062
Compensation Obligation Settlement	0	26,019
Inventory Write-down	63,420	356,700
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	0	6,875
Investment Income, Net, Amortization of Discount and Premium	(135,293)	(76,190)
Debt Securities, Available-for-Sale, Realized Gain	364,929	0
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable	127,947	(335,953)
Increase (Decrease) in Inventories	(7,861)	(1,265,134)
Increase (Decrease) in Prepaid Expense and Other Assets	(188,109)	(181,805)
Increase (Decrease) in Accounts Payable	(152,573)	84,046
Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities	346,800	(13,818)
Net Cash Provided by (Used in) Operating Activities	(6,084,868)	(5,289,416)
Payments to Acquire Debt Securities, Available-for-Sale	29,755,105	0
Payments to Acquire Held-to-Maturity Securities	0	(40,933,126)
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale	14,095,000	0
Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities	17,000,000	24,144,609
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Payments to Acquire Property, Plant, and Equipment	(183,542)	(23,182)
Net Cash Provided by (Used in) Investing Activities	1,156,353	(16,811,699)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Net Cash Provided by (Used in) Financing Activities	2,325,441	3,864,031
Proceeds from Issuance or Sale of Equity	2,325,441	3,864,031
Supplemental Cash Flow Elements [Abstract]
Stock Issuance Settle Incentive Compensation Obligation	$ 0	$ 189,398

XML

Reverse Stock Split

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Reverse Stock Split

14. Reverse Stock Split

On November 21, 2023, the Company effected a 1-for-8 reverse stock split of its Common Stock, (the "Reverse Stock Split"). The par value and other terms of the common stock were not affected by the Reverse Stock Split. The Company’s shares outstanding immediately prior to the split totaled 8,733,398, which were subsequently adjusted to 1,091,648 shares outstanding. No fractional shares were issued in connection with the reverse stock split. Stockholders who otherwise would be entitled to receive fractional shares were received payment in cash in lieu of any such resulting fractional shares of common stock as the post-reverse split amounts of common stock were rounded down to the nearest full share. Share, per share, and stock option amounts for all periods presented within the financial statements contained in the Annual Report on Form 10-K have been retroactively adjusted to reflect the Reverse Stock Split.

XML

Management Retention and Incentive Plan

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Management Retention and Incentive Plan

13. Management Retention and Incentive Plan

Under the Company’s Management Retention and Incentive Plan (the “Plan”), a portion of the consideration payable upon a change in control transaction, as defined in the Plan and its amendments, would be paid in cash to certain executive officers and key employees and recorded as compensation expense within the Statement of Operations during the period in which the change of control transaction occurs.

XML

Description of Business and Basis of Presentation

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Description of Business and Basis of Presentation

1. Description of Business and Basis of Presentation

NeuroMetrix, Inc. (the "Company" or "NeuroMetrix") develops and commercializes health care products that utilize non-invasive neurostimulation. Revenues are derived from the sale of medical devices and after-market consumable products and accessories. The Company’s products are sold in the United States and select overseas markets. They are cleared by the U.S. Food and Drug Administration ("FDA") and regulators in foreign jurisdictions where appropriate. The Company has two primary products. DPNCheck® is a point-of-care test for diabetic peripheral neuropathy, which is the most common long-term complication of Type 2 diabetes. Quell is an app-enabled, wearable device for lower extremity chronic pain and for the symptoms of fibromyalgia.

The Company held cash, cash equivalents and investment grade securities totaling $18.0 million on December 31, 2023. The Company believes that its present balance of cash resources and securities coupled with cash inflows from product sales will enable the Company to fund its operations for at least the next twelve months from the date of issuance of the financial statements. Actual cash requirements could differ from management's projections for many reasons, including changes the Company may make to its business strategy, commercial challenges, regulatory developments, changes to research and development programs, supply chain issues, staffing challenges and other items affecting the Company's projected uses of cash.

XML

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Use of Estimates and Assumptions

The preparation of financial statements in conformity with United States generally accepted accounting principles requires management to make significant estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during reporting periods. Actual results could differ from those estimates.

The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances and regularly assesses these estimates, but actual results could differ materially from these estimates. Effects of changes in estimates are recorded in the period in which they occur.

Cash and Cash Equivalents

Cash and cash equivalents include bank demand deposits and money market funds that invest primarily in U.S. government securities.

Securities

The Company invests in highly liquid, marketable debt securities with high credit ratings and typically with maturities of two years or less. Individual securities are designated by the Company as either "held-to-maturity" ("HTM") or “available-for-sale” ("AFS") at the point of investment. Securities classified as short-term have maturities of less than one year. As of December 31, 2023, all marketable securities held by the Company are classified as available for sale and had remaining contractual maturities of one year or less.

HTM securities are valued on an amortized cost basis and reviewed to determine if an allowance for credit losses should be recorded in the statements of operations. AFS securities are valued at fair value. Unrealized gains and losses on AFS securities are included as a component of accumulated other comprehensive income in the balance sheets and statements of stockholders’ equity and a component of total comprehensive loss in the statements of comprehensive loss. An AFS security is impaired if its fair value is less than amortized cost. Unrealized losses are evaluated to determine if the impairment is credit-related or non credit-related. Credit-related impairment is recognized as an allowance on the balance sheet with a corresponding adjustment to earnings, and a non credit-related impairment is recognized in other comprehensive loss. For certain types of securities, such as U.S. Treasuries, the Company generally expects zero credit losses. No allowance for credit losses was recorded on its securities portfolio for the years ended December 31, 2023 and 2022.

Concentrations of Credit Risk

Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash equivalents, trade receivables, and securities. The Company invests its cash equivalents and securities in highly rated institutions.

At December 31, 2023 and 2022, three customers accounted for 74% and two customers accounted for 31% of accounts receivable, respectively. Two customers accounted for 34% of revenues for the year ended December 31, 2023 and one customer accounted for 32% of revenues, for the year ended December 31, 2022.

Inventories

Inventories, consisting primarily of finished goods and purchased components, are stated at the lower of cost or net realizable value. Cost is determined using the first-in, first-out method. The net realizable value of inventories is based upon the types and levels of inventories held, forecasted demand, pricing, competition, and changes in technology. Deterioration in market and economic conditions could adversely affect the recovery of inventory value.

Leases

The Company presents the lease obligations on the balance sheet, by recording a right-of-use asset and a lease liability for all leases other than those that, at lease commencement, have a lease term of 12 months or less. On the lease commencement date, the Company measures and records a lease liability equal to the present value of the remaining lease payments, discounted using the rate implicit in the lease or if that cannot be readily determined, the Company's incremental borrowing rate.

Fair Value

The Company follows the provisions of Financial Accounting Standards Board (the "FASB") Accounting Standards Codification ("ASC") Topic 820-10, Fair Value Measurements and Disclosures ("ASC 820-10"), which defines fair value, establishes a framework for measuring fair value in GAAP and requires certain disclosures about fair value measurements. Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability.

As a basis for considering such assumptions, ASC 820-10 established a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows: Level 1 observable inputs such as quoted prices in active markets; Level 2 inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3 unobservable inputs for which there are little or no market data, which require the Company to develop its own assumptions. The hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value.

Note 5 presents the Company's financial assets or liabilities measured at fair value as of December 31, 2023 and 2022. The carrying amounts of the Company’s cash equivalents, accounts receivable, accounts payable, and accrued expenses approximate their fair value at December 31, 2023 and 2022 due to their short-term nature.

Revenue Recognition

Revenues include product sales, net of estimated returns. Revenue is measured as the amount of consideration the Company expects to receive in exchange for product transferred. Revenue is recognized at the point in time when contractual performance obligations have been satisfied and control of the product has been transferred to the customer. The Company has a single product delivery performance obligation. Accrued product returns using the most likely amount method are estimated based on historical data and evaluation of current information and variable consideration is not constrained. Revenue from product sales that occur via an online pharmacy agent are recognized on a gross basis and the related fulfillment fees are expensed within cost of revenues.

Accounts Receivable

Accounts receivable are recorded in the amount the Company expects to collect, net of the allowance for doubtful accounts receivable. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses based on customer past payment history, product usage activity, and recent communications with the customer. Individual customer balances which are over 90 days past due are reviewed individually for collectability and written-off when recovery is not probable. The Company does not have any off-balance sheet credit exposure related to its customers. Allowance for doubtful accounts was $25,000 as of December 31, 2023 and December 31, 2022. 

Income Taxes

The Company records income taxes using the asset and liability method. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective income tax bases, and operating loss and tax credit carryforwards. The Company’s financial statements contain certain deferred tax assets, which have arisen primarily as a result of operating losses, as well as other temporary differences between financial and tax accounting. In accordance with the provisions of the Income Taxes topic of the Codification, the Company is required to establish a valuation allowance if the likelihood of realization of the deferred tax assets is reduced based on an evaluation of objective verifiable evidence. Management judgment is required in determining the Company’s provision for income taxes, the Company’s deferred tax assets and liabilities and any valuation allowance recorded against those net deferred tax assets. The Company evaluates the weight of all available evidence to determine whether it is more likely than not that some portion or all of the net deferred income tax assets will not be realized.

Utilization of the net operating loss carryforwards (“NOL”) and research and development credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations that have occurred previously or that could occur in the future, as provided by Section 382 of the Internal Revenue Code of 1986, as well as similar state provisions. Ownership changes may limit the amount of NOL and tax credit carryforwards that can be utilized to offset future taxable income and tax, respectively. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of certain shareholders or public groups in the stock of a corporation by more than 50 percentage points over a three-year period. If the Company has experienced a change of control, utilization of its NOL or tax credits carryforwards would be subject to an annual limitation under Section 382. Any limitation may result in expiration of a portion of the NOL or research and development credit carryforwards before utilization. Subsequent ownership changes could further impact the limitation in future years. Further, until a study is completed and any limitation known, no amounts are being presented due to an uncertain tax position. A full valuation allowance has been provided against the Company’s NOL carryforwards and research and development credit carryforwards and, if an adjustment is required, this adjustment would be offset by an adjustment to the valuation allowance. Thus, there would be no impact to the balance sheet or statement of operations if an adjustment were required.

A two-step evaluation of all tax positions was performed, ensuring that these tax return positions meet the “more likely than not” recognition threshold and can be measured with sufficient precision to determine the benefit recognized in the financial statements. These evaluations provide the Company with a comprehensive model for how it should recognize, measure, present, and disclose in its financial statements certain tax positions that it has taken or expects to take on income tax returns.

Research and Development

Costs incurred in research and development are expensed as incurred. Included in research and development costs are wages, benefits, product design consulting, and other operating costs such as facilities, supplies, electronic components and overhead directly related to research and development efforts.

Product Warranty Costs

Product warranty costs are estimated based on historical experience, product failure rates, repair volume and labor costs. Warranty costs are accrued at the time of sale within cost of revenue and periodically reviewed in the aggregate. The liabilities for product warranty costs of $9,400 and $16,700 at December 31, 2023 and 2022, respectively, are included in accrued expenses and compensation in the accompanying balance sheets.

Fixed Assets and Long-Lived Assets

Fixed assets are recorded at cost and depreciated using the straight-line method over the estimated useful life of each asset. Expenditures for repairs and maintenance are charged to expense as incurred. On disposal, the related assets and accumulated depreciation are eliminated from the accounts and any resulting gain or loss is included in the Company’s statement of operations. Leasehold improvements are amortized over the shorter of the estimated useful life of the improvement or the remaining term of the lease.

The Company periodically evaluates the recoverability of its fixed assets and other long-lived assets which may result in an adjustment of estimated depreciable lives or asset impairment. When indicators of impairment are present, the carrying values of the asset are evaluated in relation to the assets operating performance and future undiscounted cash flows of the underlying assets. If an impairment is indicated, the asset carrying value is reduced to fair value based on market value estimates and assumptions concerning the amount and timing of future cash flows and discount rates.

Accounting for Stock-Based Compensation

Stock-based compensation cost is recognized ratably over the service period. The Company uses the Black-Scholes option pricing model for determining the fair value of stock options and amortizes stock-based compensation expense using the straight-line method. The Black-Scholes model requires assumptions regarding expected share price volatility, expected life of options, expected annual dividend yield, and risk-free interest rate (See Note 3 — Stock-Based Compensation).

Net Loss per Share of Common Stock

Basic and dilutive net loss per share of common stock were as follows:

	Years Ended December 31,
	2023		2022
Net loss applicable to common stockholders	$	(6,529,487)	$	(4,416,609)
Weighted average number of shares of common stock outstanding, basic and dilutive	1,041,991		889,540
Net loss per share of common stock applicable to common stockholders, basic and diluted	$	(6.27)	$	(4.97)

Shares underlying the following securities were excluded from the calculation of diluted net loss per share of common stock because their effect was anti-dilutive for each of the periods presented:

	Years Ended December 31,
	2023	2022
Options	64,659	65,683
Unvested restricted stock awards	6,222	12,031
Unvested restricted stock units	60,492	24,341
Convertible preferred stock	8	8
Total	131,381	102,063

Advertising and Promotional Costs

Advertising and promotional costs are expensed as incurred. Advertising and promotion expense were $132,806 and $268,703, in 2023 and 2022, respectively.

Accumulated Other Comprehensive Items

As of December 31, 2023, the Company had accumulated other comprehensive income of $240,171 for net unrealized gains on AFS securities, in addition to net loss in the statement of operations. As of December 31, 2022, the Company had no components of accumulated other comprehensive income or loss other than net loss.

Segments

The Company operates in a single segment covering the sale of medical equipment and consumables. The majority of the Company’s assets, revenues, and expenses for 2023 and 2022 were located in or derived from operations in the United States. Revenues from sales outside the United States accounted for approximately 20% and 14% of total revenues in 2023 and 2022, respectively.

Risks and Uncertainties

The Company is subject to risks common to companies in the medical device industry, including, but not limited to, environmental risk such as the COVID-19 pandemic, development by the Company or its competitors of new technological innovations, cybersecurity risk, dependence on key personnel, customers’ reimbursement from third-party payers, protection of proprietary technology, and compliance with regulations of the U.S Food and Drug Administration, Federal Trade Commission and other governmental agencies.

The Company relies on in-house assembly and third-party manufacturers to manufacture the major portion of its current products and product components. The disruption or termination of the supply of these products or a significant increase in the cost of these products from these sources could have an adverse effect on the Company's business, financial position, and result of operations.

Prior period reclassifications

We have reclassified certain amounts in prior periods to conform with current presentation. Money market funds in the amount of $81,751 which were reported within held-to-maturity securities at December 31, 2022 have been reclassified into cash and cash equivalents.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB") and are adopted by us as of the specified effective date. Unless otherwise discussed, we believe that the impact of recently adopted and recently issued accounting pronouncements will not have a material impact on our balance sheets, results of operations and cash flows.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments. The guidance in ASU 2016-13 replaces the incurred loss impairment methodology under current GAAP. The new impairment requires immediate recognition of estimated credit losses expected to occur for most financial assets and certain other instruments. It applies to all entities. For trade receivables, loans and HTM debt securities, entities are required to estimate lifetime expected credit losses. Trading and AFS debt securities are required to be recorded at fair value. SEC small reporting companies were required to adopt this new guidance in fiscal years beginning on or after December 15, 2022. The Company adopted this guidance on a prospective basis as of January 1, 2023, and it had no material impact on the financial statements.

In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures, which requires public entities, on an annual basis, to provide disclosures of specific categories in the rate reconciliation, additional information for reconciling items that meet a quantitative threshold and income taxes paid disaggregated by jurisdiction. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of this standard on the Company’s Financial Statements and disclosures.

XML

Stock-Based Compensation

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Stock-Based Compensation

3. Stock-Based Compensation

The Company's 2022 Equity Incentive Plan (the "Stock Plan") provides for granting of incentive and nonqualified stock option and stock bonus awards to officers, employees and outside consultants. Outstanding options under the Stock Plan generally vest over four years and terminate 10 years after the grant date, or earlier if the option holder is no longer an executive officer, employee, consultant, advisor or director of the Company. As of December 31, 2023, 203,643 shares of common stock were authorized for issuance under the Stock Plan, of which 41,583 shares had been issued, 6,222 restricted stock awards and 60,492 restricted stock units remain unvested, 64,659 shares were subject to outstanding options at a weighted average exercise price of $25.73 per share and 26,520 shares were available for future grant.

The Company's 2009 Non-Qualified Inducement Stock Plan (the “Inducement Plan”) is intended to encourage employees, including prospective employees, upon whose efforts the Company depends for the successful conduct of its business, to acquire an equity interest in the Company. The Inducement Plan provides for the granting of awards, including non-qualified stock options, restricted stock, and unrestricted stock. As of December 31, 2023, 156.25 shares of common stock were authorized for issuance and were available for future grant under the Inducement Plan.

The exercise price of stock options awarded under the Stock Plan and the Inducement Plan may not be less than the fair value of the common stock on the date of the option grant. For holders of more than 10% of the Company’s total combined voting power of all classes of stock, incentive stock options may not be granted at less than 110% of the fair value of the Company’s common stock and for a term not to exceed five years.

The Company's 2010 Employee Stock Purchase Plan (the "ESPP"), amended and restated in 2021 to increase stock purchase capacity, authorizes an annual increase on the first day of each of the Company’s fiscal years equal to the lesser of (i) 6,250 shares, (ii) 1 percent of the shares of common stock outstanding on the last day of the immediately preceding fiscal year, or (iii) such lesser number of shares as is determined by the Board. All full-time employees and certain part-time employees are eligible to participate in the ESPP. For part-time employees to be eligible, they must have customary employment of more than five months in any calendar year and more than 20 hours per week. Employees who, after exercising their rights to purchase shares under the ESPP, would own shares representing 5% or more of the voting power of the Company’s common stock, are ineligible to participate.

Under the ESPP, participating employees can authorize the Company to withhold up to 10% of their earnings during consecutive six-month payment periods for the purchase of the shares. At the conclusion of each period, participating employees can purchase shares at 85% of the lower of their fair value at the beginning or end of the period. The ESPP is regarded as a compensatory plan. For the years ended December 31, 2023 and 2022, the Company issued 4,902 and 2,526 shares of its common stock, respectively, under the ESPP. As of December 31, 2023, there were 22,089 remaining shares to be issued under the ESPP.

The Company uses the Black-Scholes option pricing model for determining the fair value of shares of common stock issued or to be issued under the ESPP. The following assumptions were used in determining fair value: The risk-free interest rate assumption is based on the United States Treasury’s constant maturity rate for a six month term (corresponding to the expected option term) on the date the option was granted. The expected dividend yield is zero as the Company does not currently pay dividends nor expects to do so during the expected option term. An expected term of six months is used based on the duration of each plan offering period. The volatility assumption is based on daily historical volatility during the time period that corresponds to the expected option term and expected future stock price volatility.

There were no new issuance of stock options in 2023. The assumptions that the Company used in the Black-Scholes pricing model to determine the fair value of the stock options used in the calculation of stock-based compensation expense for the year ended December 31, 2022 were as follows:

	Years Ended December 31,
		2022
Risk-free interest rate		1.8%	—%	3.7%
Expected dividend yield		—
Expected option term		5 years
Volatility		70.0%

A summary of option activity for the year ended December 31, 2023 is presented below:

	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value
Outstanding at December 31, 2022	65,662	$	26.15
Granted	—	—
Exercised	—	—
Forfeited	(1,000)	40.21
Expired	(3)	4,224.00
Outstanding at December 31, 2023	64,659	$	25.73	6.8	$	—
Vested or expected to vest at December 31, 2023	61,773	$	25.74	6.8	$	—
Exercisable at December 31, 2023	61,773	$	25.74	6.8	$	—

Expected to vest options are determined by applying the estimated forfeiture rate to the total outstanding options. Aggregate intrinsic value represents the total pre-tax intrinsic value (the aggregate difference between the closing stock price of the Company’s common stock as of December 31, 2023, as applicable, and the exercise price for the in-the-money options) that would have been received by the option holders if all the in-the-money options had been exercised on December 31, 2023.

The weighted average per share grant-date fair values of options granted during 2023 and 2022 was zero and $30.72, respectively.

The aggregate intrinsic value of options issued or exercised during 2023 and 2022 was zero.

Total unrecognized stock-based compensation costs related to non-vested stock options was $36,885, which related to 5,500 shares with a per share weighted fair value of $25.40 as of December 31, 2023. This unrecognized cost is expected to be recognized over a weighted average period of approximately 1.7 years.

During 2023 and 2022, certain employees and directors have been granted restricted stock awards and restricted stock units that are service based. The fair value of the restricted stock awards and units are calculated based on the closing price of common stock on the date of issuance.

During 2023, 51,210 restricted stock units were granted to employees and members of the Board of Directors that vest at different times during the years 2023 through 2026. Included therein were grants to the members of the Board of Directors, 21,584 restricted stock units in May 2023, that cliff vest in one year from issuance and 29,626 restricted stock units to employees that vest quarterly at different times during the years 2023 through 2026. During 2022, 12,000 restricted stock awards and 27,655 restricted stock units were granted to employees and members of the Board of Directors that vest at different times during the years 2022 through 2025. Included therein were grants to the members of the Board of Directors of 6,616

restricted stock units in May 2022, that cliff vest in one year from issuance, 3,434 restricted stock units in July 2022 to a new member of the Board of Directors that vest quarterly over a two year period and 12,000 restricted stock awards and 17,605 restricted stock units to employees that vest quarterly at different times during the years 2022 through 2025.

A summary of restricted stock activity for the year ended December 31, 2023 is presented below:

	Restricted Stock Awards	Weighted Average Grant Date Fair Value		Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested at December 31, 2022	12,032	$	43.44	24,341	$	27.20
Granted	—	$	—	51,210	$	7.45
Vested	(5,094)	$	44.98	(14,535)	$	26.64
Forfeited	(716)	$	34.23	(524)	$	28.41
Unvested at December 31, 2023	6,222	$	43.28	60,492	$	15.10

The Company recorded stock-based compensation expense of $699,505 and $477,062 for 2023 and 2022, respectively.

Total compensation cost related to non-vested awards not yet recognized at December 31, 2023 was $698,854. These unrecognized costs are expected to be recognized over a weighted-average period of 1.4 years.

XML

Investments, Debt and Equity Securities

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure

4. Securities

The Company's marketable debt securities are classified as either AFS or HTM pursuant to ASC 320 - Investments - Debt Securities. The following table summarizes the valuations and unrealized gains and losses of AFS securities which are recorded at estimated fair value as of December 31, 2023. The Company held no AFS securities as of December 31, 2022.

	December 31, 2023
			Gross Unrealized
Available-for-sale securities	Cost		Gains		Losses		Credit Losses		Estimated Fair Value
U.S. government bonds	$	4,412,935	$	5,665	$	—	$	—	$	4,418,600
Commercial paper	11,612,099		234,506		—		—		11,846,605
Total	$	16,025,034	$	240,171	$	—	$	—	$	16,265,205

HTM securities are valued at amortized cost. The Company held no HTM securities as of December 31, 2023. The following tables summarize the valuations of HTM securities as of December 31, 2022.

	December 31, 2022
Held-to-maturity securities	Amortized Cost		Credit Losses		Estimated Fair Value
U.S. government bonds	$	3,457,651	$	—	$	3,456,580
Corporate bonds	4,011,569		—		3,950,380
Commercial paper	9,395,487		—		9,387,914
Total	$	16,864,707	$	—	$	16,794,874

The Company evaluates all HTM and AFS securities for impairment at each reporting period. It determined that changes in the fair value of its securities at December 31, 2023 resulted primarily from interest rate fluctuations subsequent to the purchase date of the securities. There was no deterioration in the credit worthiness of the issuers and no credit losses were recorded as of December 31, 2023.

XML

Fair Value Measures and Disclosures

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

5.     Fair Value Measurements

The following tables set forth the Company’s financial instruments that were measured at fair value:

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	1,284,290	$	1,284,290	$	—	$	—
U.S. government bonds	$	4,418,600	$	4,418,600	$	—	$	—
Commercial paper	$	11,846,605	$	—	$	11,846,605	$	—
Total	$	17,549,495	$	5,702,890	$	11,846,605	$	—

	December 31, 2022
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	1,551,027	$	1,551,027	$	—	$	—
Total	$	1,551,027	$	1,551,027	$	—	$	—

The Company's accounts receivable, accounts payable, and accrued expenses are valued at cost which approximates fair value.

XML

Inventories

12 Months Ended

Dec. 31, 2023

Inventory Disclosure [Abstract]

Inventories

. Inventories

Inventories consist of the following:

	December 31,
	2023		2022
Purchased components	$	1,151,381	$	982,129
Finished goods	408,047		632,858
	$	1,559,428	$	1,614,987

The Company recorded a charge of $63,420 and $356,700 to cost of revenues in 2023 and 2022, respectively, for Quell inventory to reduce the carrying value to net realizable value.

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure

4. Securities

The Company's marketable debt securities are classified as either AFS or HTM pursuant to ASC 320 - Investments - Debt Securities. The following table summarizes the valuations and unrealized gains and losses of AFS securities which are recorded at estimated fair value as of December 31, 2023. The Company held no AFS securities as of December 31, 2022.

	December 31, 2023
			Gross Unrealized
Available-for-sale securities	Cost		Gains		Losses		Credit Losses		Estimated Fair Value
U.S. government bonds	$	4,412,935	$	5,665	$	—	$	—	$	4,418,600
Commercial paper	11,612,099		234,506		—		—		11,846,605
Total	$	16,025,034	$	240,171	$	—	$	—	$	16,265,205

HTM securities are valued at amortized cost. The Company held no HTM securities as of December 31, 2023. The following tables summarize the valuations of HTM securities as of December 31, 2022.

	December 31, 2022
Held-to-maturity securities	Amortized Cost		Credit Losses		Estimated Fair Value
U.S. government bonds	$	3,457,651	$	—	$	3,456,580
Corporate bonds	4,011,569		—		3,950,380
Commercial paper	9,395,487		—		9,387,914
Total	$	16,864,707	$	—	$	16,794,874

The Company evaluates all HTM and AFS securities for impairment at each reporting period. It determined that changes in the fair value of its securities at December 31, 2023 resulted primarily from interest rate fluctuations subsequent to the purchase date of the securities. There was no deterioration in the credit worthiness of the issuers and no credit losses were recorded as of December 31, 2023.

XML

Fixed Assets

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Fixed Assets

. Fixed Assets

Fixed assets consist of the following:

	Estimated Useful Life (Years)	December 31,
		2023		2022
Computer and laboratory equipment	3	$	629,970	$	459,218
Furniture and equipment	3	33,104		33,104
Production equipment	7	296,180		296,180
Leasehold improvements	*	70,918		58,128
		1,030,172		846,630
Less – accumulated depreciation		(736,723)		(681,011)
		$	293,449	$	165,619

*Lesser of life of lease or estimated useful life.

Depreciation expense was $55,712 and $49,391 for 2023 and 2022, respectively. During 2022, the Company wrote off fully depreciated fixed assets no longer in service with a cost basis and accumulated depreciation of $674,520. It also disposed of assets with a cost basis of $6,875 and recognized a loss in this amount.

XML

Accrued Expenses

12 Months Ended

Dec. 31, 2023

Payables and Accruals [Abstract]

Accrued Expenses

. Accrued Expenses and Compensation

Accrued expenses and compensation consist of the following:

	December 31,
	2023		2022
Professional services	$	298,534	$	155,000
Compensation	346,245		249,224
Warranty	9,400		16,700
Clinical	39,000		—
Sales tax	141,672		131,621
Other	41,888		37,394
	$	876,739	$	589,939

XML

Income Taxes

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Taxes

. Income Taxes

Current income tax expense (benefit) attributable to continuing operations was zero for the years ended December 31, 2023 and 2022.

The Company’s effective income tax rate differs from the statutory federal income tax rate as follows for the years ended December 31, 2023 and 2022.

	December 31,
	2023		2022
Federal statutory rate	(21.0)	%	(21.0)	%
State tax provision, net of federal provision	(1.0)		(4.9)
Permanent items	0.1		0.1
Federal research and development credits	(2.0)		(3.3)
382 Limitation - NOL and tax credits	—		(17.4)
Valuation allowance	23.9		46.5
Effective income tax rate	—		—

The Company’s deferred tax assets consist of the following:

	December 31,
	2023		2022
Deferred tax assets:
Net operating loss carryforwards	$	4,289,409	$	3,369,688
Research and development credit carryforwards	544,415		310,000
Accrued expenses	44,497		74,459
Inventory reserve	97,378		88,983
Stock-based compensation	311,039		323,337
Lease liability	56,481		87,872
Capitalized R&D	1,131,902		719,888
Other	1,596		—
Total gross deferred tax assets	6,476,717		4,974,227
Valuation allowance	(6,418,062)		(4,868,469)
Deferred tax liabilities:
Right of use asset	$	(58,655)	$	(91,502)
Other	$	—	$	(14,256)
Net deferred tax assets	$	—	$	—

At December 31, 2023, the Company had federal NOLs of approximately $135.7 million, of which $121.1 million began to expire in 2022 and $14.5 million have an indefinite carryforward. At December 31, 2023, the Company had state NOLs of $57.6 million, some of which have an indefinite carryforward, and others that begin to expire in 2025. At December 31, 2023, the Company has federal and state tax credits of approximately $1.8 million and $0.9 million, respectively, which may be available to reduce future taxable income and related taxes thereon. These amounts include tax benefits of approximately $2.4 million and $75,000 attributable to NOL and tax credit carryforwards, respectively, that result from the exercise of employee stock options. The Company experienced an ownership change in 2019 as defined under Internal Revenue Service Regulations, which significantly reduced the tax benefits associated with these carryforwards under Internal Revenue Code Sections 382 and 383. The federal and state research and development credits each began to expire in 2022.

In accordance with the provisions of the Income Taxes topic of the Codification, the Company has evaluated the positive and negative evidence bearing upon the realizability of its deferred tax assets, which are comprised principally of net operating losses. Management has determined that it is more likely than not that the Company will not recognize the benefits of federal and state deferred tax assets and, as a result, a valuation allowance of approximately $6.4 million and $4.9 million has been established at December 31, 2023 and 2022, respectively. The Company experienced a change in control during 2019. Accordingly, utilization of their respective consolidated and/ or separately computed NOL's and/ or tax credit carryforwards is subject to an annual limitation for federal tax purposes under Internal Revenue Code Sections 382 and 383. Due to this change

in control, the Company estimates that approximately $123,800,000 of federal NOL's and/or tax credit carryforwards are effectively eliminated according to the Internal Revenue Code Sections 382 and 383 limitations. A large portion of state NOLs and/ or tax credit carry forwards are also eliminated. The Company has not recorded any amounts for unrecognized tax benefits as of December 31, 2023 or 2022. The Company files tax returns as prescribed by the tax laws of the jurisdictions in which it operates. In the normal course of business, the Company is subject to examination by federal and state jurisdictions, where applicable. There are currently no pending income tax examinations. The Company’s tax years are still open under statute from December 31, 2020 to the present. Earlier years may be examined to the extent that tax credit or net operating loss carryforwards are used in future periods. The Company’s policy is to record interest and penalties related to income taxes as part of its income tax provision.

XML

Commitments and Contingencies

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

. Commitments and Contingencies

Operating Leases

The Company's lease on its Woburn, Massachusetts corporate office and manufacturing facilities (the “Woburn Lease”) extends through September 2025 at a monthly base rent of $13,846 and with a 5-year extension option. The Company's lease on its former corporate office in Waltham, Massachusetts (the "Waltham lease") ended in February 2022. During the years ended December 31, 2023 and 2022 the Company recorded sublet income on the Waltham lease totaling zero and $22,795, respectively within operating expenses on the Company's Statement of Operations.

The following is a maturity analysis of the annual cash flows of the operating lease liabilities as of December 31, 2023:

2024	$	165,785
2025	117,431
Total minimum lease payments	$	283,216
Discount rate, 15.0%	$	42,340
Lease obligation, current portion	148,391
Lease obligation, net of current portion	92,485
	$	283,216

Total recorded rent expense net of sublet income was $197,310 and $163,061, for 2023 and 2022, respectively. The Company records rent expense on its facility leases on a straight-line basis over the lease term. The remaining operating lease term was 1.7 years as of December 31, 2023.

Contingencies

The Company is not party to or aware of any legal proceedings.

XML

Retirement Plan

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Retirement Plan

. Retirement Plan

The Company maintains a 401(k) defined contribution savings plan for its employees who meet certain service period and age requirements. Contributions are permitted up to the maximum allowed under the Internal Revenue Code of each covered employee’s salary. The savings plan permits the Company to contribute at its discretion. In 2023 and 2022 the Company made no contributions to the plan.

XML

Stockholders' Equity

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Shareholders' Equity and Share-Based Payments

12. Stockholders’ Equity

Preferred stock and convertible preferred stock consist of the following:

	December 31,
	2023		2022
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2023 and 2022; no shares issued and outstanding at December 31, 2023 and 2022	$	—	$	—
Series B convertible preferred stock, $0.001 par value, 147,000 shares designated at December 31, 2023 and 2022, and 200 shares issued and outstanding at December 31, 2023 and 2022, respectively	1		1

Preferred stock activity

As of December 31, 2023, 200 shares of Series B convertible preferred stock remained outstanding. The shares of Series B convertible preferred stock are convertible into the equivalent of 8 shares of common stock at the option of the holder.

Other equity activity

During 2022, the Company issued in settlement of management incentive compensation 6,276 shares of fully vested common stock with a value of $215,417.

During 2023 and 2022, respectively, the Company issued pursuant to its ATM Agreement 537,094 shares of common stock, net of fees totaling $142,795 for proceeds of $2,305,753 and 114,542 shares of its common stock, net of fees totaling $175,355 for proceeds of $3,833,772.

During 2023 and 2022, respectively, the Company issued 4,902 shares of fully vested common stock with a value of $19,688 and 2,526 shares of fully vested common stock with a value of $30,259 pursuant to the Company's 2010 Employee Stock Purchase Plan, respectively.

As of December 31, 2023 and 2022, the Company had 25,000,000 shares of common stock authorized and 1,524,939, and 971,492 shares issued and outstanding, respectively. Each share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders. Common stockholders are not entitled to receive dividends unless declared by the Board of Directors.

At December 31, 2023, the Company has reserved authorized shares of common stock for future issuance as follows:

Outstanding stock options	64,659
Convertible preferred stock	8
Unvested restricted stock units	60,492
Possible future issuance under inducement plan	156
Possible future issuance under stock option plans	26,520
Possible future issuance under employee stock purchase plan	22,089
Total	173,924

Subsequently from January 1, 2024 to February 29, 2024, the Company issued 458,380 shares of common stock under its ATM program net of fees totaling $46,995 for proceeds of $1,519,099.

XML

Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2023

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure

Description	Balance at Beginning of Period		Charged to costs and expenses		Charged to other accounts		Recoveries/ (Deductions)			Balance at End of Period
December 31, 2023
Allowance for Doubtful Accounts	$	25,000	$	—	$	—	$	—		$	25,000
Deferred Tax Asset Valuation Allowance	4,868,469		1,946,667		—		(397,074)		(1)	6,418,062
Accrued Product Returns	1,000		—		—		(1,000)			—
Warranty Reserve	16,700		—		—		(7,300)			9,400
December 31, 2022
Allowance for Doubtful Accounts	$	25,000	$	—	$	—	$	—		$	25,000
Deferred Tax Asset Valuation Allowance	2,827,759		2,187,921		—		(147,211)		(1)	4,868,469
Accrued Product Returns	39,000		—		—		(38,000)			1,000
Warranty Reserve	28,400		—		—		(11,700)			16,700

(1)Expiration of Federal and State Net Operating Loss Carryforwards and other reductions.

XML

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Use of Estimates and Assumptions

Use of Estimates and Assumptions

The preparation of financial statements in conformity with United States generally accepted accounting principles requires management to make significant estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during reporting periods. Actual results could differ from those estimates.

The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances and regularly assesses these estimates, but actual results could differ materially from these estimates. Effects of changes in estimates are recorded in the period in which they occur.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include bank demand deposits and money market funds that invest primarily in U.S. government securities.

Concentrations of Credit Risk

Concentrations of Credit Risk

Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash equivalents, trade receivables, and securities. The Company invests its cash equivalents and securities in highly rated institutions.

At December 31, 2023 and 2022, three customers accounted for 74% and two customers accounted for 31% of accounts receivable, respectively. Two customers accounted for 34% of revenues for the year ended December 31, 2023 and one customer accounted for 32% of revenues, for the year ended December 31, 2022.

Inventories

Inventories

Inventories, consisting primarily of finished goods and purchased components, are stated at the lower of cost or net realizable value. Cost is determined using the first-in, first-out method. The net realizable value of inventories is based upon the types and levels of inventories held, forecasted demand, pricing, competition, and changes in technology. Deterioration in market and economic conditions could adversely affect the recovery of inventory value.

Fair Value

Fair Value

The Company follows the provisions of Financial Accounting Standards Board (the "FASB") Accounting Standards Codification ("ASC") Topic 820-10, Fair Value Measurements and Disclosures ("ASC 820-10"), which defines fair value, establishes a framework for measuring fair value in GAAP and requires certain disclosures about fair value measurements. Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability.

As a basis for considering such assumptions, ASC 820-10 established a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows: Level 1 observable inputs such as quoted prices in active markets; Level 2 inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3 unobservable inputs for which there are little or no market data, which require the Company to develop its own assumptions. The hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value.

Note 5 presents the Company's financial assets or liabilities measured at fair value as of December 31, 2023 and 2022. The carrying amounts of the Company’s cash equivalents, accounts receivable, accounts payable, and accrued expenses approximate their fair value at December 31, 2023 and 2022 due to their short-term nature.

Revenue Recognition

Revenue Recognition

Revenues include product sales, net of estimated returns. Revenue is measured as the amount of consideration the Company expects to receive in exchange for product transferred. Revenue is recognized at the point in time when contractual performance obligations have been satisfied and control of the product has been transferred to the customer. The Company has a single product delivery performance obligation. Accrued product returns using the most likely amount method are estimated based on historical data and evaluation of current information and variable consideration is not constrained. Revenue from product sales that occur via an online pharmacy agent are recognized on a gross basis and the related fulfillment fees are expensed within cost of revenues.

Accounts Receivable

Accounts Receivable

Accounts receivable are recorded in the amount the Company expects to collect, net of the allowance for doubtful accounts receivable. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses based on customer past payment history, product usage activity, and recent communications with the customer. Individual customer balances which are over 90 days past due are reviewed individually for collectability and written-off when recovery is not probable. The Company does not have any off-balance sheet credit exposure related to its customers. Allowance for doubtful accounts was $25,000 as of December 31, 2023 and December 31, 2022.

Income Taxes

Income Taxes

The Company records income taxes using the asset and liability method. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective income tax bases, and operating loss and tax credit carryforwards. The Company’s financial statements contain certain deferred tax assets, which have arisen primarily as a result of operating losses, as well as other temporary differences between financial and tax accounting. In accordance with the provisions of the Income Taxes topic of the Codification, the Company is required to establish a valuation allowance if the likelihood of realization of the deferred tax assets is reduced based on an evaluation of objective verifiable evidence. Management judgment is required in determining the Company’s provision for income taxes, the Company’s deferred tax assets and liabilities and any valuation allowance recorded against those net deferred tax assets. The Company evaluates the weight of all available evidence to determine whether it is more likely than not that some portion or all of the net deferred income tax assets will not be realized.

Utilization of the net operating loss carryforwards (“NOL”) and research and development credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations that have occurred previously or that could occur in the future, as provided by Section 382 of the Internal Revenue Code of 1986, as well as similar state provisions. Ownership changes may limit the amount of NOL and tax credit carryforwards that can be utilized to offset future taxable income and tax, respectively. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of certain shareholders or public groups in the stock of a corporation by more than 50 percentage points over a three-year period. If the Company has experienced a change of control, utilization of its NOL or tax credits carryforwards would be subject to an annual limitation under Section 382. Any limitation may result in expiration of a portion of the NOL or research and development credit carryforwards before utilization. Subsequent ownership changes could further impact the limitation in future years. Further, until a study is completed and any limitation known, no amounts are being presented due to an uncertain tax position. A full valuation allowance has been provided against the Company’s NOL carryforwards and research and development credit carryforwards and, if an adjustment is required, this adjustment would be offset by an adjustment to the valuation allowance. Thus, there would be no impact to the balance sheet or statement of operations if an adjustment were required.

A two-step evaluation of all tax positions was performed, ensuring that these tax return positions meet the “more likely than not” recognition threshold and can be measured with sufficient precision to determine the benefit recognized in the financial statements. These evaluations provide the Company with a comprehensive model for how it should recognize, measure, present, and disclose in its financial statements certain tax positions that it has taken or expects to take on income tax returns.

Research and Development

Research and Development

Costs incurred in research and development are expensed as incurred. Included in research and development costs are wages, benefits, product design consulting, and other operating costs such as facilities, supplies, electronic components and overhead directly related to research and development efforts.

Product Warranty Costs

Product Warranty Costs

Product warranty costs are estimated based on historical experience, product failure rates, repair volume and labor costs. Warranty costs are accrued at the time of sale within cost of revenue and periodically reviewed in the aggregate. The liabilities for product warranty costs of $9,400 and $16,700 at December 31, 2023 and 2022, respectively, are included in accrued expenses and compensation in the accompanying balance sheets.

Fixed Assets and Long-Lived Assets

Fixed Assets and Long-Lived Assets

Fixed assets are recorded at cost and depreciated using the straight-line method over the estimated useful life of each asset. Expenditures for repairs and maintenance are charged to expense as incurred. On disposal, the related assets and accumulated depreciation are eliminated from the accounts and any resulting gain or loss is included in the Company’s statement of operations. Leasehold improvements are amortized over the shorter of the estimated useful life of the improvement or the remaining term of the lease.

The Company periodically evaluates the recoverability of its fixed assets and other long-lived assets which may result in an adjustment of estimated depreciable lives or asset impairment. When indicators of impairment are present, the carrying values of the asset are evaluated in relation to the assets operating performance and future undiscounted cash flows of the underlying assets. If an impairment is indicated, the asset carrying value is reduced to fair value based on market value estimates and assumptions concerning the amount and timing of future cash flows and discount rates.

Accounting for Stock-Based Compensation

Accounting for Stock-Based Compensation

Stock-based compensation cost is recognized ratably over the service period. The Company uses the Black-Scholes option pricing model for determining the fair value of stock options and amortizes stock-based compensation expense using the straight-line method. The Black-Scholes model requires assumptions regarding expected share price volatility, expected life of options, expected annual dividend yield, and risk-free interest rate (See Note 3 — Stock-Based Compensation).

Net Loss per Common Share

Net Loss per Share of Common Stock

Basic and dilutive net loss per share of common stock were as follows:

	Years Ended December 31,
	2023		2022
Net loss applicable to common stockholders	$	(6,529,487)	$	(4,416,609)
Weighted average number of shares of common stock outstanding, basic and dilutive	1,041,991		889,540
Net loss per share of common stock applicable to common stockholders, basic and diluted	$	(6.27)	$	(4.97)

Shares underlying the following securities were excluded from the calculation of diluted net loss per share of common stock because their effect was anti-dilutive for each of the periods presented:

	Years Ended December 31,
	2023	2022
Options	64,659	65,683
Unvested restricted stock awards	6,222	12,031
Unvested restricted stock units	60,492	24,341
Convertible preferred stock	8	8
Total	131,381	102,063

Advertising and Promotional Costs

Advertising and Promotional Costs

Advertising and promotional costs are expensed as incurred. Advertising and promotion expense were $132,806 and $268,703, in 2023 and 2022, respectively.

Accumulated Other Comprehensive Items

Accumulated Other Comprehensive Items

As of December 31, 2023, the Company had accumulated other comprehensive income of $240,171 for net unrealized gains on AFS securities, in addition to net loss in the statement of operations. As of December 31, 2022, the Company had no components of accumulated other comprehensive income or loss other than net loss.

Segments

Segments

The Company operates in a single segment covering the sale of medical equipment and consumables. The majority of the Company’s assets, revenues, and expenses for 2023 and 2022 were located in or derived from operations in the United States. Revenues from sales outside the United States accounted for approximately 20% and 14% of total revenues in 2023 and 2022, respectively.

Risks and Uncertainties

Risks and Uncertainties

The Company is subject to risks common to companies in the medical device industry, including, but not limited to, environmental risk such as the COVID-19 pandemic, development by the Company or its competitors of new technological innovations, cybersecurity risk, dependence on key personnel, customers’ reimbursement from third-party payers, protection of proprietary technology, and compliance with regulations of the U.S Food and Drug Administration, Federal Trade Commission and other governmental agencies.

The Company relies on in-house assembly and third-party manufacturers to manufacture the major portion of its current products and product components. The disruption or termination of the supply of these products or a significant increase in the cost of these products from these sources could have an adverse effect on the Company's business, financial position, and result of operations.

Lessee, Leases

Leases

The Company presents the lease obligations on the balance sheet, by recording a right-of-use asset and a lease liability for all leases other than those that, at lease commencement, have a lease term of 12 months or less. On the lease commencement date, the Company measures and records a lease liability equal to the present value of the remaining lease payments, discounted using the rate implicit in the lease or if that cannot be readily determined, the Company's incremental borrowing rate.

Marketable Securities, Policy

Securities

The Company invests in highly liquid, marketable debt securities with high credit ratings and typically with maturities of two years or less. Individual securities are designated by the Company as either "held-to-maturity" ("HTM") or “available-for-sale” ("AFS") at the point of investment. Securities classified as short-term have maturities of less than one year. As of December 31, 2023, all marketable securities held by the Company are classified as available for sale and had remaining contractual maturities of one year or less.

HTM securities are valued on an amortized cost basis and reviewed to determine if an allowance for credit losses should be recorded in the statements of operations. AFS securities are valued at fair value. Unrealized gains and losses on AFS securities are included as a component of accumulated other comprehensive income in the balance sheets and statements of stockholders’ equity and a component of total comprehensive loss in the statements of comprehensive loss. An AFS security is impaired if its fair value is less than amortized cost. Unrealized losses are evaluated to determine if the impairment is credit-related or non credit-related. Credit-related impairment is recognized as an allowance on the balance sheet with a corresponding adjustment to earnings, and a non credit-related impairment is recognized in other comprehensive loss. For certain types of securities, such as U.S. Treasuries, the Company generally expects zero credit losses. No allowance for credit losses was recorded on its securities portfolio for the years ended December 31, 2023 and 2022.

Recently Issued or Adopted Accounting Pronouncements

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB") and are adopted by us as of the specified effective date. Unless otherwise discussed, we believe that the impact of recently adopted and recently issued accounting pronouncements will not have a material impact on our balance sheets, results of operations and cash flows.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments. The guidance in ASU 2016-13 replaces the incurred loss impairment methodology under current GAAP. The new impairment requires immediate recognition of estimated credit losses expected to occur for most financial assets and certain other instruments. It applies to all entities. For trade receivables, loans and HTM debt securities, entities are required to estimate lifetime expected credit losses. Trading and AFS debt securities are required to be recorded at fair value. SEC small reporting companies were required to adopt this new guidance in fiscal years beginning on or after December 15, 2022. The Company adopted this guidance on a prospective basis as of January 1, 2023, and it had no material impact on the financial statements.

XML

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Basic and dilutive net loss per share of common stock were as follows:

	Years Ended December 31,
	2023		2022
Net loss applicable to common stockholders	$	(6,529,487)	$	(4,416,609)
Weighted average number of shares of common stock outstanding, basic and dilutive	1,041,991		889,540
Net loss per share of common stock applicable to common stockholders, basic and diluted	$	(6.27)	$	(4.97)

Schedule of Anti-Dilutive Securities

Shares underlying the following securities were excluded from the calculation of diluted net loss per share of common stock because their effect was anti-dilutive for each of the periods presented:

	Years Ended December 31,
	2023	2022
Options	64,659	65,683
Unvested restricted stock awards	6,222	12,031
Unvested restricted stock units	60,492	24,341
Convertible preferred stock	8	8
Total	131,381	102,063

XML

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Schedule of Weighted Average Grant-Date Fair Value of Stock Options

The assumptions that the Company used in the Black-Scholes pricing model to determine the fair value of the stock options used in the calculation of stock-based compensation expense for the year ended December 31, 2022 were as follows:

	Years Ended December 31,
		2022
Risk-free interest rate		1.8%	—%	3.7%
Expected dividend yield		—
Expected option term		5 years
Volatility		70.0%

Summary of Option Activity

A summary of option activity for the year ended December 31, 2023 is presented below:

	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value
Outstanding at December 31, 2022	65,662	$	26.15
Granted	—	—
Exercised	—	—
Forfeited	(1,000)	40.21
Expired	(3)	4,224.00
Outstanding at December 31, 2023	64,659	$	25.73	6.8	$	—
Vested or expected to vest at December 31, 2023	61,773	$	25.74	6.8	$	—
Exercisable at December 31, 2023	61,773	$	25.74	6.8	$	—

Nonvested Restricted Stock Shares Activity

A summary of restricted stock activity for the year ended December 31, 2023 is presented below:

	Restricted Stock Awards	Weighted Average Grant Date Fair Value		Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested at December 31, 2022	12,032	$	43.44	24,341	$	27.20
Granted	—	$	—	51,210	$	7.45
Vested	(5,094)	$	44.98	(14,535)	$	26.64
Forfeited	(716)	$	34.23	(524)	$	28.41
Unvested at December 31, 2023	6,222	$	43.28	60,492	$	15.10

XML

Investments, Debt and Equity Securities (Tables)

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-Sale Securities Reconciliation

	December 31, 2023
			Gross Unrealized
Available-for-sale securities	Cost		Gains		Losses		Credit Losses		Estimated Fair Value
U.S. government bonds	$	4,412,935	$	5,665	$	—	$	—	$	4,418,600
Commercial paper	11,612,099		234,506		—		—		11,846,605
Total	$	16,025,034	$	240,171	$	—	$	—	$	16,265,205

Debt Securities, Held-to-Maturity, Allowance for Credit Loss

	December 31, 2022
Held-to-maturity securities	Amortized Cost		Credit Losses		Estimated Fair Value
U.S. government bonds	$	3,457,651	$	—	$	3,456,580
Corporate bonds	4,011,569		—		3,950,380
Commercial paper	9,395,487		—		9,387,914
Total	$	16,864,707	$	—	$	16,794,874

XML

Fair Value Measures and Disclosures (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	1,284,290	$	1,284,290	$	—	$	—
U.S. government bonds	$	4,418,600	$	4,418,600	$	—	$	—
Commercial paper	$	11,846,605	$	—	$	11,846,605	$	—
Total	$	17,549,495	$	5,702,890	$	11,846,605	$	—

	December 31, 2022
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	1,551,027	$	1,551,027	$	—	$	—
Total	$	1,551,027	$	1,551,027	$	—	$	—

XML

Inventories (Tables)

12 Months Ended

Dec. 31, 2023

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following:

	December 31,
	2023		2022
Purchased components	$	1,151,381	$	982,129
Finished goods	408,047		632,858
	$	1,559,428	$	1,614,987

Schedule of Available-for-Sale Securities Reconciliation

	December 31, 2023
			Gross Unrealized
Available-for-sale securities	Cost		Gains		Losses		Credit Losses		Estimated Fair Value
U.S. government bonds	$	4,412,935	$	5,665	$	—	$	—	$	4,418,600
Commercial paper	11,612,099		234,506		—		—		11,846,605
Total	$	16,025,034	$	240,171	$	—	$	—	$	16,265,205

Debt Securities, Held-to-Maturity, Allowance for Credit Loss

	December 31, 2022
Held-to-maturity securities	Amortized Cost		Credit Losses		Estimated Fair Value
U.S. government bonds	$	3,457,651	$	—	$	3,456,580
Corporate bonds	4,011,569		—		3,950,380
Commercial paper	9,395,487		—		9,387,914
Total	$	16,864,707	$	—	$	16,794,874

XML

Fixed Assets (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Fixed Assets

Fixed assets consist of the following:

	Estimated Useful Life (Years)	December 31,
		2023		2022
Computer and laboratory equipment	3	$	629,970	$	459,218
Furniture and equipment	3	33,104		33,104
Production equipment	7	296,180		296,180
Leasehold improvements	*	70,918		58,128
		1,030,172		846,630
Less – accumulated depreciation		(736,723)		(681,011)
		$	293,449	$	165,619

*Lesser of life of lease or estimated useful life.

XML

Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2023

Payables and Accruals [Abstract]

Accrued Compensation and Expenses

Accrued expenses and compensation consist of the following:

	December 31,
	2023		2022
Professional services	$	298,534	$	155,000
Compensation	346,245		249,224
Warranty	9,400		16,700
Clinical	39,000		—
Sales tax	141,672		131,621
Other	41,888		37,394
	$	876,739	$	589,939

XML

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Reconciliation of Effective Income Tax Rate to Statutory Federal Rate

The Company’s effective income tax rate differs from the statutory federal income tax rate as follows for the years ended December 31, 2023 and 2022.

	December 31,
	2023		2022
Federal statutory rate	(21.0)	%	(21.0)	%
State tax provision, net of federal provision	(1.0)		(4.9)
Permanent items	0.1		0.1
Federal research and development credits	(2.0)		(3.3)
382 Limitation - NOL and tax credits	—		(17.4)
Valuation allowance	23.9		46.5
Effective income tax rate	—		—

Schedule of Deferred Tax Assets

The Company’s deferred tax assets consist of the following:

	December 31,
	2023		2022
Deferred tax assets:
Net operating loss carryforwards	$	4,289,409	$	3,369,688
Research and development credit carryforwards	544,415		310,000
Accrued expenses	44,497		74,459
Inventory reserve	97,378		88,983
Stock-based compensation	311,039		323,337
Lease liability	56,481		87,872
Capitalized R&D	1,131,902		719,888
Other	1,596		—
Total gross deferred tax assets	6,476,717		4,974,227
Valuation allowance	(6,418,062)		(4,868,469)
Deferred tax liabilities:
Right of use asset	$	(58,655)	$	(91,502)
Other	$	—	$	(14,256)
Net deferred tax assets	$	—	$	—

XML

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Lessee, Operating Lease, Liability, Maturity

The following is a maturity analysis of the annual cash flows of the operating lease liabilities as of December 31, 2023:

2024	$	165,785
2025	117,431
Total minimum lease payments	$	283,216
Discount rate, 15.0%	$	42,340
Lease obligation, current portion	148,391
Lease obligation, net of current portion	92,485
	$	283,216

XML

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Preferred stock and convertible preferred stock

Preferred stock and convertible preferred stock consist of the following:

	December 31,
	2023		2022
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2023 and 2022; no shares issued and outstanding at December 31, 2023 and 2022	$	—	$	—
Series B convertible preferred stock, $0.001 par value, 147,000 shares designated at December 31, 2023 and 2022, and 200 shares issued and outstanding at December 31, 2023 and 2022, respectively	1		1

Reserved Authorized Shares of Common Stock for Future Issuance

At December 31, 2023, the Company has reserved authorized shares of common stock for future issuance as follows:

Outstanding stock options	64,659
Convertible preferred stock	8
Unvested restricted stock units	60,492
Possible future issuance under inducement plan	156
Possible future issuance under stock option plans	26,520
Possible future issuance under employee stock purchase plan	22,089
Total	173,924

XML

Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Organization And Basis Of Presentation [Line Items]
Substantial Doubt about Going Concern, within One Year [true false]	false
Cash and Cash Equivalents, at Carrying Value	$ 1,731,946	$ 4,335,020
Cash, Cash Equivalents, and Short-Term Investments	$ 18,000,000

XML

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2023
Concentration Risk [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 1,731,946	$ 4,335,020
Marketing and Advertising Expense [Abstract]
Advertising and promotion expense	$ 132,806	$ 268,703
Segment Reporting [Abstract]
Revenues from sales outside the United States, percentage	20.00%	14.00%
Product Warranties Disclosures [Abstract]
Liabilities for product warranty costs	$ 9,400	$ 16,700
Accounts Receivable, Allowance for Credit Loss, Current	25,000	25,000
Retained Earnings (Accumulated Deficit)	(210,109,353)	(203,579,866)
Other Comprehensive Income (Loss), Net of Tax	240,171	0
Debt Securities, Held-to-Maturity, Fair Value		16,794,874
Cash and Cash Equivalents, at Carrying Value	1,731,946	$ 4,335,020
Money Market Funds | From Held To Maturity Securities
Concentration Risk [Line Items]
Cash and Cash Equivalents, at Carrying Value	81,751
Product Warranties Disclosures [Abstract]
Cash and Cash Equivalents, at Carrying Value	$ 81,751
Accounting Standards Update 2016-13
Concentration Risk [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]			true
Change in Accounting Principle, Accounting Standards Update, Adoption Date			Jan. 01, 2023
Product Warranties Disclosures [Abstract]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
Change in Accounting Principle, Accounting Standards Update, Adoption Date			Jan. 01, 2023
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]			true
Accounts Receivable [Member] | Two Customers [Member] | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage		31.00%
Accounts Receivable [Member] | Three Customers | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage	74.00%
Revenue Benchmark [Member] | Two Customers [Member] | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage	34.00%
Revenue Benchmark [Member] | One Customer [Member] | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage		32.00%

XML

Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Diluted	$ (6,529,487)	$ (4,416,609)
Net Income (Loss) Available to Common Stockholders, Basic	$ (6,529,487)	$ (4,416,609)
Weighted Average Number of Shares Outstanding, Diluted	1,041,991	889,540
Weighted Average Number of Shares Outstanding, Basic	1,041,991	889,540
Earnings Per Share, Diluted	$ (6.27)	$ (4.97)
Earnings Per Share, Basic	$ (6.27)	$ (4.97)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive common stock equivalents excluded from calculation of diluted net income per common share	131,381	102,063
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive common stock equivalents excluded from calculation of diluted net income per common share	8	8
Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive common stock equivalents excluded from calculation of diluted net income per common share	64,659	65,683
Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive common stock equivalents excluded from calculation of diluted net income per common share	6,222	12,031
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive common stock equivalents excluded from calculation of diluted net income per common share	60,492	24,341

XML

Stock-Based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended			12 Months Ended
	May 31, 2023	Jul. 31, 2022	May 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)				64,659	65,662
Weighted average exercise price (in usd per share)				$ 25.73	$ 26.15
Weighted average grant-date fair value of options granted (in usd per share)				$ 0	$ 30.72
Aggregate instrinsic value of options issued or exercised				$ 0	$ 0
Unrecognized stock-based compensation costs related to non-vested stock options				$ 698,854
Non-vested stock options (in shares)				5,500
Weighted average fair value of non-vested stock options (in usd per share)				$ 25.40
Weighted average period of recognition				1 year 4 months 24 days
Stock-based compensation expense				$ 699,505	$ 477,062
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term					5 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate					0.00%
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount				$ 36,885
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value					$ 27.20
Options Held
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition				1 year 8 months 12 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period				0	12,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				(5,094)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number				6,222	12,032
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value				44.98
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value				34.23
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 43.28	$ 43.44
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period				(716)
Restricted Stock | Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period					12,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period				51,210	27,655
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period				(14,535)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number				60,492	24,341
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 7.45
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value				26.64
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value				28.41
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 15.10
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period				(524)
Restricted Stock Units (RSUs) | Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period				29,626	17,605
Restricted Stock Units (RSUs) | Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year	2 years	1 year
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	21,584	3,434	6,616
2009 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant (in shares)				156.25
2010 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant (in shares)				22,089
Percentage of fair value of common stock at date of grant				85.00%
Maximum percentage of earnings employee can authorize to withhold, percentage				10.00%
Award vesting rights				All full-time employees and certain part-time employees are eligible to participate in the ESPP. For part-time employees to be eligible, they must have customary employment of more than five months in any calendar year and more than 20 hours per week. Employees who, after exercising their rights to purchase shares under the ESPP, would own shares representing 5% or more of the voting power of the Company’s common stock, are ineligible to participate.
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate				0.00%
2010 ESPP | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Annual Increase Amount				6,250
Share Based Compensation Arrangement By Share Based Payment Award Annual Increase Percentage				1.00%
Two Zero Two Two Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
Expiration period				10 years
Shares outstanding (in shares)				64,659
Weighted average exercise price (in usd per share)				$ 25.73
Two Zero Two Two Stock Plan | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)				203,643
Shares available for future grant (in shares)				26,520
Shares, Issued				41,583
Two Thousand Twenty Two Stock Plan And Two Thousand Nine Inducement Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of combined voting power of all classes of stock				10.00%
Two Thousand Twenty Two Stock Plan And Two Thousand Nine Inducement Plan | Minimum | More Than 10 Percent Voting Power
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair value of common stock at date of grant				110.00%
Two Thousand Twenty Two Stock Plan And Two Thousand Nine Inducement Plan | Maximum | More Than 10 Percent Voting Power
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period				5 years

XML

Stock-Based Compensation - Weighted Average Grant-Date Fair Value Used in the Calculation of Stock-Based Compensation Expense (Details)	12 Months Ended
	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	70.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.80%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	3.70%

XML

Stock-Based Compensation - Summary of Option Activity (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options outstanding, beginning balance (in shares) | shares	65,662
Number of options granted (in shares) | shares	0
Number of options exercised (in shares) | shares	0
Number of options forfeited (in shares) | shares	(1,000)
Number of options expired (in shares) | shares	(3)
Number of options outstanding, ending balance (in shares) | shares	64,659
Number of options vested or expected to vest (in shares) | shares	61,773
Number of options exercisable (in shares) | shares	61,773
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price of options outstanding, beginning of period (in usd per share) | $ / shares	$ 26.15
Weighted average exercise price of options granted (in usd per share) | $ / shares	0
Weighted average exercise price of options exercised (in usd per share) | $ / shares	0
Weighted average exercise price of options forfeited (in usd per share) | $ / shares	40.21
Weighted average exercise price of options expired (in usd per share) | $ / shares	4,224
Weighted average exercise price of options outstanding, end of period (in usd per share) | $ / shares	25.73
Weighted average exercise price of options vested or expected to vest (in usd per share) | $ / shares	25.74
Weighted average exercise price of options exercisable (in usd per share) | $ / shares	$ 25.74
Weighted Average Remaining Contractual Life (in years) and Aggregate Intrinsic Value
Weighted average remaining contractual life of options outstanding (in years)	6 years 9 months 18 days
Weighted average remaining contractual life of options vested or expected to vest (in years)	6 years 9 months 18 days
Weighted average remaining contractual life of options exercisable (in years)	6 years 9 months 18 days
Aggregate intrinsic value of options outstanding | $	$ 0
Aggregate intrinsic value of options vested and expected to vest | $	0
Aggregate intrinsic value of options exercisable | $	$ 0

XML

Investments, Debt and Equity Securities (Details) - AFS - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	$ 16,025,034
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	240,171
Debt Securities, Available-for-Sale	16,265,205	$ 0
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0
Commercial Paper
Debt Securities, Available-for-Sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	11,612,099
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	234,506
Debt Securities, Available-for-Sale	11,846,605
US Government Agencies Debt Securities
Debt Securities, Available-for-Sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	4,412,935
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	5,665
Debt Securities, Available-for-Sale	$ 4,418,600

XML

Investments, Debt and Equity Securities (Details) - HTM - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Schedule of Held-to-Maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	$ 0	$ 16,864,707
Debt Securities, Held-to-Maturity, Fair Value		16,794,874
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	$ 0
Commercial Paper
Schedule of Held-to-Maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss		9,395,487
Debt Securities, Held-to-Maturity, Fair Value		9,387,914
US Government Agencies Debt Securities
Schedule of Held-to-Maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss		3,457,651
Debt Securities, Held-to-Maturity, Fair Value		3,456,580
Corporate Debt Securities
Schedule of Held-to-Maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss		4,011,569
Debt Securities, Held-to-Maturity, Fair Value		$ 3,950,380

XML

Fair Value Measures and Disclosures (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 16,265,205	$ 0
Assets, Fair Value Disclosure	17,549,495	1,551,027
Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	5,702,890	1,551,027
Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	11,846,605
Money Market Funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	1,284,290	1,551,027
Money Market Funds | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	1,284,290	$ 1,551,027
US Government Agencies Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	4,418,600
US Government Agencies Debt Securities | Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	4,418,600
Commercial Paper
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	11,846,605
Commercial Paper | Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 11,846,605

XML

Inventories (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Net of Reserves	$ 1,151,381	$ 982,129
Inventory, Finished Goods, Net of Reserves	408,047	632,858
Inventories	1,559,428	1,614,987
Inventory Write-down	$ 63,420	$ 356,700

XML

Fixed Assets (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 1,030,172	$ 846,630
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(736,723)	(681,011)
Fixed assets, net	$ 293,449	165,619
Computer And Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, estimated useful life	3 years
Fixed assets, gross	$ 629,970	459,218
Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, estimated useful life	3 years
Fixed assets, gross	$ 33,104	33,104
Production Equipment [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, estimated useful life	7 years
Fixed assets, gross	$ 296,180	296,180
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, gross	$ 70,918	$ 58,128

XML

Fixed Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	$ 0	$ 6,875
Depreciation expense	55,712	49,391
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	$ 0	(6,875)
Disposal
Property, Plant and Equipment [Line Items]
Tangible Assets Disposal Original Cost		6,875
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		6,875
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		(6,875)
Write Off
Property, Plant and Equipment [Line Items]
Tangible Assets Disposal Original Cost		674,520
Tangible Assets Disposal Accumulated Depreciation		$ 674,520

XML

Accrued Expenses (Detail) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Sales and Excise Tax Payable, Current	$ 141,672	$ 131,621
Accrued Professional Fees, Current	298,534	155,000
Accrued Salaries, Current	346,245	249,224
Product Warranty Accrual, Current	9,400	16,700
Other Accrued Liabilities, Current	41,888	37,394
Accrued expenses	876,739	589,939
Accrued Clinical Current	$ 39,000	$ 0

XML

Income Taxes Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	(21.00%)	(21.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	(1.00%)	(4.90%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent	(2.00%)	(3.30%)
Effective Income Tax Rate Reconciliation 382 Limitation	0.00%	(17.40%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	23.90%	46.50%
Effective Income Tax Rate Reconciliation, Percent	0.00%	0.00%

XML

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Tax Credit Carryforward [Line Items]
Current Federal, State and Local, Tax Expense (Benefit)	$ 0	$ 0
NOLAndTaxCreditCarryforwardsEliminated	$ 123,800,000
Federal tax provision (benefit) rate	21.00%	21.00%
Deferred tax assets, valuation allowance	$ 6,418,062	$ 4,868,469
Tax benefits attributable to tax credit caryforwards	75,000
Tax benefits attributable to NOL	2,400,000
Unrecognized Tax Benefits	$ 0	$ 0
Earliest Tax Year
Tax Credit Carryforward [Line Items]
Open Tax Year	2020
Federal Tax Authority
Tax Credit Carryforward [Line Items]
TaxCreditCarryforwardsExpirationBeginningYear	2022
Tax credit carryforwards	$ 1,800,000
Net operating loss carryforwards	$ 135,700,000
Federal Tax Authority | Portion of Current [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	2022
Federal Tax Authority | Indefinite [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	$ 14,500,000
Federal Tax Authority | Expiration Begins 2022 [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	$ 121,100,000
State Tax Authority
Tax Credit Carryforward [Line Items]
TaxCreditCarryforwardsExpirationBeginningYear	2022
Tax credit carryforwards	$ 900,000
Net operating loss carryforwards	$ 57,600,000
State Tax Authority | Portion of Current [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	2025

XML

Income Taxes - Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 4,289,409	$ 3,369,688
Deferred Tax Assets, Tax Credit Carryforwards, Research	544,415	310,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	44,497	74,459
Deferred Tax Assets, Inventory	97,378	88,983
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost	311,039	323,337
Deferred Tax Assets Right Of Use Assets	56,481	87,872
Deferred Tax Assets Capitalized Research And Development	1,131,902	719,888
Deferred Tax Assets, Other	1,596	0
Deferred Tax Assets, Gross, Total	6,476,717	4,974,227
Deferred Tax Assets, Valuation Allowance	(6,418,062)	(4,868,469)
Deferred Tax Liabilities, Leasing Arrangements	58,655	91,502
Deferred Tax Liabilities, Other	0	(14,256)
Deferred Tax Assets, Net of Valuation Allowance, Total	$ 0	$ 0

XML

Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating Leased Assets [Line Items]
Operating Lease, Weighted Average Discount Rate, Percent	15.00%
Operating Lease, Expense	$ 197,310	$ 163,061
Sublease Income	$ 0	$ 22,795
Operating Lease, Weighted Average Remaining Lease Term	1 year 8 months 12 days
Woburn Lease [Member]
Operating Leased Assets [Line Items]
Operating lease, renewal term	5 years
Monthly Rent [Member] | Woburn Lease [Member]
Operating Leased Assets [Line Items]
Operating Lease, Payments	$ 13,846

XML

Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 165,785
Lessee, Operating Lease, Liability, to be Paid, Year Two	117,431
Lessee, Operating Lease, Liability, to be Paid	283,216
Operating Lease Discount	42,340
Operating Lease, Liability, Current	148,391	$ 148,391
Operating Lease, Liability, Noncurrent	$ 92,485	$ 207,516
Operating Lease, Weighted Average Discount Rate, Percent	15.00%

XML

Retirement Plan Retirement Plan - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Contributions to the plan	$ 0	$ 0

XML

Stockholders' Equity - Preferred Stock and Convertible Preferred Stock (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Preferred Non-Convertible Stock
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)	0	0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Value, Issued	$ 0	$ 0
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Value, Issued	$ 1	$ 1
Series B Preferred Stock | Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)	200	200
Preferred stock, shares issued (in shares)	200	200
Preferred stock, shares authorized (in shares)	147,000	147,000
Preferred Stock, Value, Issued	$ 1	$ 1
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001

XML

Stockholders' Equity - Additional Information (Detail) - USD ($)	2 Months Ended	12 Months Ended
	Feb. 26, 2024	Dec. 31, 2023	Dec. 31, 2022	Nov. 21, 2023	Nov. 20, 2023
Class of Stock [Line Items]
Stock Issued During Period, Value, Employee Stock Purchase Plan		$ 19,688	$ 30,259
Stock Issued During Period, Shares, Employee Stock Purchase Plans		4,902	2,526
Common Stock, Shares, Outstanding		1,524,939	971,492	1,091,648	8,733,398
Common Stock, Voting Rights		Each share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders.
Common Stock, Par or Stated Value Per Share		$ 0.0001	$ 0.0001
Common Stock, Shares Authorized		25,000,000	25,000,000
Proceeds from Issuance or Sale of Equity		$ 2,325,441	$ 3,864,031
Common Stock, Shares, Issued		1,524,939	971,492
Stock Issued During Period, Value, Restricted Stock Award, Gross		$ 0	$ 0
Number of options exercised (in shares)		0
Stock Issued During Period, Value, New Issues		$ 2,305,753	$ 3,833,772
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans		4,902	2,526
Stock Issued During Period, Shares, New Issues		537,094	114,542
Stock Issued During Period, Shares, Restricted Stock Award, Gross		17,261	4,806
Stock Issued During Period, Value, Restricted Stock Award, Gross		$ 2	$ 1
Stock Issued During Period, Value, New Issues		54	11
At The Market Offering Program [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock		2,305,753	3,833,772
At The Market Offering Program [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock	$ 1,519,099
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, Employee Stock Purchase Plan		$ 19,688	$ 30,259
Stock Issued During Period, Shares, Employee Stock Purchase Plans		4,902	2,526
Common Stock [Member] | Management Service, Incentive
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues			6,276
Stock Issued During Period, Value, New Issues			$ 215,417
Common Stock [Member] | At The Market Offering Program [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues		537,094	114,542
Payments of Stock Issuance Costs		$ 142,795	$ 175,355
Common Stock [Member] | At The Market Offering Program [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	458,380
Payments of Stock Issuance Costs	$ 46,995
Series B Preferred Stock | Common Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)		8
Series B Preferred Stock | Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding		200	200
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		14,535
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number		60,492	24,341
Restricted Stock
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		5,094
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number		6,222	12,032

XML

Stockholders' Equity - Common Stock Reserved for Future Issuance (Details)	Dec. 31, 2023 shares
Class of Stock [Line Items]
Total common shares reserved for future issuance	173,924
Inducement Plan
Class of Stock [Line Items]
Total common shares reserved for future issuance	156
Stock Option Plans
Class of Stock [Line Items]
Total common shares reserved for future issuance	26,520
Outstanding Stock Options
Class of Stock [Line Items]
Total common shares reserved for future issuance	64,659
Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Total common shares reserved for future issuance	8
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Total common shares reserved for future issuance	60,492
Employee Stock
Class of Stock [Line Items]
Total common shares reserved for future issuance	22,089

XML

Reverse Stock Split - Additional Information (Detail) - shares	Nov. 21, 2023	Dec. 31, 2023	Nov. 20, 2023	Dec. 31, 2022
Equity [Abstract]
Common Stock, Shares, Outstanding	1,091,648	1,524,939	8,733,398	971,492
Stockholders' Equity, Reverse Stock Split	1-for-8 reverse stock split of its Common Stock

XML

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Beginning Balance	$ 25,000	$ 25,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	25,000	25,000
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Beginning Balance	4,868,469	2,827,759
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	1,946,667	2,187,921
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	6,418,062	4,868,469
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(397,074)	(147,211)
SalesReturnsReservesMember [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Beginning Balance	1,000	39,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	0	1,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(1,000)	(38,000)
SEC Schedule, 12-09, Reserve, Warranty [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Beginning Balance	16,700	28,400
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	9,400	16,700
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	$ (7,300)	$ (11,700)

XML

Label	Element	Value
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	$ 22,572,104