Basis of Presentation

These unaudited condensed consolidated financial statements have been prepared in accordance with the rules and regulations of the United States Securities and Exchange Commission (“SEC”) and include all assets and liabilities of the Company.

SEC rules and regulations allow the omission of certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) so long as the statements are not misleading. In the opinion of management, these financial statements and accompanying notes contain all adjustments (consisting of normal recurring adjustments) necessary to present fairly the financial position and results of operations for the periods presented herein. These condensed consolidated financial statements should be read in conjunction with the consolidated audited financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, filed with the SEC on March 25, 2022. The results of operations for the nine months ended September 30, 2022, are not necessarily indicative of the results to be expected for the year ending December 31, 2022. The Company’s significant accounting policies are set forth in Note 1 to the consolidated financial statements in its Annual Report on Form 10-K for the year ended December 31, 2021.

Liquidity and Capital Resources

The condensed consolidated financial statements have been prepared assuming the Company will continue to operate as a going concern, which contemplates the realization of assets and settlement of liabilities in the normal course of business, and does not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classifications of liabilities that may result from uncertainty related to its ability to continue as a going concern within one year from the date of issuance of these condensed consolidated financial statements.

For the nine months ended September 30, 2022, and 2021, the Company incurred a net loss of $8.1 million and $7.2 million, respectively, and used cash in operating activities of $8.2 million and $7.7 million, respectively. The Company had an accumulated deficit of $258.5 million and $250.4 million as of September 30, 2022, and December 31, 2021, respectively. To date, the Company’s operations have been principally financed from proceeds from the issuance of preferred and common stock and, to a lesser extent, cash generated from product sales. It is anticipated that the Company will continue to generate operating losses and use cash in operating activities. The Company’s continuation as a going concern is dependent upon its ability to increase sales, and/or raise additional funds through the capital markets. Whether and when the Company can attain profitability and positive cash flows from operations or obtain additional financing is uncertain.

The Company is actively generating additional scientific and clinical data to have it published in leading industry publications. We believe the publication of such data would help sales efforts as the Company approaches new prospects. The Company continues to make changes to the sales strategy, including a focus on revenue growth by expanding the use of silicon nitride in other areas outside of spinal fusion applications. The Company has also acquired equipment and certain proprietary know-how for the purpose of developing, manufacturing and commercializing armored plates made from boron carbide and a composite of boron carbide and silicon carbide for military, law enforcement and other civilian uses. We also expect the acquisition of TA&T will further broaden the Company’s sources of revenue.

The Company has common stock that is publicly traded and has been able to successfully raise capital when needed since the date of the Company’s initial public offering in February 2014. On January 3, 2022, the Company received a notice from Nasdaq Listing Qualifications department (the “Staff”) of the Nasdaq Stock Market LLC (“Nasdaq”) stating that the bid price of the Company’s common stock for the last 30 consecutive trading days had closed below the minimum $1.00 per share required for continued listing under Listing Rule 5550(a)(2). The Nasdaq notification letter does not result in the immediate delisting of the Company’s common stock, and the stock will continue to trade uninterrupted on the The Nasdaq Capital Market under the symbol “SINT”. The letter from the Staff further indicated that if the Company did not regain compliance with Rule 5550(a)(2) by July 5, 2022, the Company may be eligible for additional time to regain compliance. On July 6, 2022, the Company received notice from the Staff that the Company was eligible for an additional 180 calendar day period, or until January 2, 2023, to regain compliance. Delisting of the Company’s common shares from The Nasdaq Capital Market may adversely impact its ability to raise capital on the public markets. The Company intends to actively monitor the closing bid price for its common stock and will consider available options to resolve the deficiency and regain compliance with Nasdaq Listing Rule 5550(a)(2).

On February 25, 2021, the Company entered into an Equity Distribution Agreement (the “2021 Distribution Agreement”) with Maxim Group LLC (“Maxim”), pursuant to which the Company may sell from time to time, shares of the Company’s common stock having an aggregate offering price of up to $2.0 million through Maxim, as agent.

Subject to the terms and conditions of the 2021 Distribution Agreement, Maxim will use its commercially reasonable efforts to sell the Shares from time to time, based on our instructions. Under the 2021 Distribution Agreement, Maxim may sell the Shares by any method permitted by law deemed to be an “at-the-market” offering as defined in Rule 415 promulgated under the Securities Act of 1933, as amended (the “Securities Act”), including, without limitation, sales made directly on the Nasdaq Capital Market. We have no obligation to sell any shares under the ATM and may at any time suspend offers under the 2021 Distribution Agreement. The Offering will terminate upon the earlier of (i) the sale of shares having an aggregate offering price of $2.0 million, (ii) the termination by either Maxim or the Company upon the provision of fifteen (15) days written notice, or (iii) February 25, 2023. Under the terms of the 2021 Distribution Agreement, Maxim will be entitled to a transaction fee at a fixed rate of 2.0% of the gross sales price of Shares sold under the 2021 Distribution Agreement. The Company will also reimburse Maxim for certain expenses incurred in connection with the 2021 Distribution Agreement and agreed to provide indemnification and contribution to Maxim with respect to certain liabilities under the Securities Act and the Securities Exchange Act of 1934, as amended. As of September 30, 2022, there have been no sales of shares of common stock under the 2021 Distribution Agreement.

On October 17, 2022, the Company closed on the sale of 4,656 Units for gross proceeds of approximately $4.7 million pursuant to the terms of a Rights Offering to holders of the Company’s common stock, Series B and Series C preferred stock and holders of certain outstanding common stock warrants. See Subsequent Events below for a more detailed discussion of the Rights Offering.

Although the Company is seeking to obtain additional equity and/or debt financing, such funding is not assured and may not be available to the Company on favorable or acceptable terms and may involve significant restrictive covenants. Any additional equity financing is also not assured and, if available to the Company, will most likely be dilutive to its current stockholders. If the Company is not able to obtain additional debt or equity financing on a timely basis, the impact on the Company will be material and adverse.

These uncertainties create substantial doubt about our ability to continue as a going concern. The condensed consolidated financial statements do not include any adjustments that might result from the outcome of these uncertainties.

Grant Revenue

Revenues from grants, contracts, and awards provided by governmental agencies are recorded based upon the terms of the specific grant agreements, which generally provide that revenue is earned when the allowable costs specified in the applicable grant agreement have been incurred. Cash received from federal grants and awards can be subject to audit by the grantor and, if the examination results in a disallowance of any expenditure, repayment could be required.

Grant, contract, and award receivables relate to allowable amounts expended or otherwise incurred in connection with the terms of a grant or award and for which reimbursement or draw upon the grant funds have not yet taken place.

New Accounting Pronouncements Not Yet Adopted

In August 2020, the Financial Statement Accounting Board (the “FASB”) issued ASU 2020-06 which simplifies the accounting for convertible instruments and its application of the derivatives scope exception for contracts in an entity’s own equity. For contracts in an entity’s own equity, the new guidance eliminates some of the current requirements for equity classification such as the requirement that settlement in unregistered shares is permitted. In addition, the new guidance reduces the number of accounting models that require separating embedded conversion features from convertible instruments, including eliminating the requirement to recognize a beneficial conversion feature if the conversion feature is in the money and does not require bifurcation as a derivative liability. As a result, only conversion features accounted for under the substantial premium model and those that require bifurcation will be accounted for separately. The guidance also addresses how convertible instruments are accounted for in the diluted earnings per share calculation and requires enhanced disclosures about the terms of convertible instruments and contracts in an entity’s own equity. The guidance is effective for the Company for annual periods beginning after December 15, 2023, and interim periods within that year, with early adoption permitted. The Company plans to adopt the new standards January 1, 2023. The adoption of this standard will result in certain warrants currently classified as fair value liabilities to be reclassified within stockholder’s equity. We are currently assessing any other impact that adoption will have on our financial position and results of operations.

The Company has reviewed all other recently issued, but not yet adopted, accounting standards, in order to determine their effects, if any, on its results of operations, financial position or cash flows. Based on that review, the Company believes that no other pronouncements will have a significant effect on its financial statements.