Biggest changeAs a result of our acquisition of the KARNO generator technology, we plan to assume a government contract with the United States Office of Naval Research that is not expected to have a material impact on our business. 28 Table of Contents Results of Operations Comparison of Years Ended December 31, 2022 and 2021 The following table summarizes our results of operations on a consolidated basis for the years ended December 31, 2022 and 2021 (in thousands, except share and per share data): Year Ended December 31, 2022 2021 $ Change % Change Revenues Product sales and other $ 2,106 $ 200 $ 1,906 953.0 % Total revenues 2,106 200 1,906 953.0 % Cost of revenues Product sales and other 8,778 2,737 6,041 220.7 % Total cost of revenues 8,778 2,737 6,041 220.7 % Gross loss (6,672) (2,537) (4,135) 163.0 % Operating expenses Research and development 110,370 58,261 52,109 89.4 % Selling, general and administrative expenses 41,988 35,299 6,689 18.9 % Total operating expenses 152,358 93,560 58,798 62.8 % Loss from operations (159,030) (96,097) (62,933) 65.5 % Interest income 5,724 779 4,945 634.8 % Loss on impairment and disposal of assets (19) (730) 711 (97.4) % Other expense, net (32) — (32) N/A Net loss $ (153,357) $ (96,048) $ (57,309) 59.7 % Net loss per share, basic and diluted $ (0.87) $ (0.56) $ (0.31) 55.4 % Weighted-average shares outstanding, basic and diluted 175,400,486 172,216,477 3,184,009 1.8 % Revenue Sales increased $1.9 million, driven by sales associated with our Hybrid products.
Biggest changeWe plan to seek additional government contracts in the future and may reassess the classification of such contracts as revenue based on business strategy. 22 Table of Contents Results of Operations Comparison of Years Ended December 31, 2023 and 2022 The following table summarizes our results of operations on a consolidated basis for the years ended December 31, 2023 and 2022 (in thousands, except share and per share data): Year Ended December 31, 2023 2022 $ Change % Change Revenues Product sales and other $ 672 $ 2,106 $ (1,434) (68.1) % Total revenues 672 2,106 (1,434) (68.1) % Cost of revenues Product sales and other 1,716 8,778 (7,062) (80.5) % Total cost of revenues 1,716 8,778 (7,062) (80.5) % Gross loss (1,044) (6,672) 5,628 (84.4) % Operating expenses Research and development 82,240 110,370 (28,130) (25.5) % Selling, general and administrative 42,611 41,988 623 1.5 % Exit and termination costs 11,474 — 11,474 N/A Total operating expenses 136,325 152,358 (16,033) (10.5) % Loss from operations (137,369) (159,030) 21,661 (13.6) % Interest income 13,808 5,724 8,084 141.2 % Gain (loss) on impairment and disposal of assets 1 (19) 20 N/A Other income (expense), net 50 (32) 82 N/A Net loss $ (123,510) $ (153,357) $ 29,847 (19.5) % Net loss per share, basic and diluted $ (0.68) $ (0.87) $ 0.19 (21.8) % Weighted-average shares outstanding, basic and diluted 181,411,069 175,400,486 6,010,583 3.4 % Revenue Sales associated with our Hybrid products decreased $1.4 million.
Cash used primarily related to a net loss of $153.4 million, adjusted for $8.7 million change in working capital accounts and $45.2 million in certain non-cash expenses (including $28.8 million related to acquired in-process research and development comprised of the noncash component and the cash component attributable to investing activities, $7.0 million related to share-based compensation, $5.6 million related to inventory write-downs and $2.5 million related to depreciation, amortization and accretion charges).
Cash used primarily related to a net loss of $153.4 million, adjusted for $8.7 million change in working capital accounts and $45.2 million in certain non-cash expenses (including $28.8 million related to acquired in-process research and development comprised of the non-cash component and the cash component attributable to investing activities, $7.0 million related to share-based compensation, $5.6 million related to inventory write-downs and $2.5 million related to depreciation, amortization and accretion charges).
The unrealized gains and losses of the portfolio may remain volatile as changes in the general interest environment and supply and demand fluctuations of the securities within our portfolio impact daily market valuations.
The unrealized gains and losses of the portfolio may remain volatile as changes in the general interest rate environment and supply and demand fluctuations of the securities within our portfolio impact daily market valuations.
In addition, these unusual and unpredictable market developments may also create liquidity challenges for certain of the assets in our investment portfolio. Based on our past performance, we believe our current assets will be sufficient to continue and execute on our business strategy and meet our capital requirements for the next twelve months.
In addition, these unusual and unpredictable market developments may also create liquidity challenges for certain of the assets in our investment portfolio. Based on our past performance, we believe our current and long-term assets will be sufficient to continue and execute on our business strategy and meet our capital requirements for the next twelve months.
However, even with this approach we may incur investment losses as a result of unusual or unpredictable market developments, and we may experience reduced investment earnings if the yields on investments deemed to be low risk decline due to unpredictable market developments.
However, even with this approach we may incur investment losses as a result of unusual or unpredictable market developments, and we may experience reduced investment earnings if the yields on investments deemed to be low risk remain low or decline further due to unpredictable market developments.
While our significant accounting policies are described in the notes to our financial statements (see Note 2 in the accompanying audited consolidated financial statements), we believe that the following accounting policies require a greater degree of judgment and complexity.
While our significant accounting policies are described in the notes to our financial statements (see Note 3 in the accompanying audited consolidated financial statements), we believe that the following accounting policies require a greater degree of judgment and complexity.
Factors that also affect SG&A expense include the total number of employees, costs incurred as a result of operating as a public company, including compliance with the rules and regulations of the U.S. Securities and Exchange Commission, legal, audit, insurance, investor relations activities and other administrative and professional services.
Factors that also affect selling, general and administrative expense include the total number of employees, costs incurred as a result of operating as a public company, including compliance with the rules and regulations of the U.S. Securities and Exchange Commission, legal, audit, insurance, investor relations activities and other administrative and professional services.
Management bases its estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for 31 Table of Contents making judgments about the carrying values of assets and liabilities. Actual results could differ from those estimates, and such differences could be material to our financial statements.
Management bases its estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ from those estimates, and such differences could be material to our financial statements.
Cash used primarily related to the purchase of investments totaling $268.6 million, the cash component of acquired in-process research and development of $14.4 million and property and equipment of $2.9 million, partially offset by the sale or maturity of investments of $263.7 million. For the year ended December 31, 2021, cash flows used in investing activities were $66.0 million.
For the year ended December 31, 2022, cash flows used in investing activities were $22.0 million. Cash used primarily related to the purchase of investments totaling $268.6 million, the cash component of acquired in-process research and development of $14.4 million and property and equipment of $2.9 million, partially offset by the sale or maturity of investments of $263.7 million.
The preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the balance sheet date, as well as the reported expenses incurred during the reporting period.
The preparation of these consolidated financial statements requires us to make estimates 25 Table of Contents and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the balance sheet date, as well as the reported expenses incurred during the reporting period.
See Recent Accounting Pronouncements issued, not yet adopted under Note 2 – Summary of Significant Accounting Policies in the notes to the 2022 consolidated financial statements for more information about recent accounting pronouncements, the timing of their adoption and our assessment, to the extent we have made one, of their potential impact on our financial condition and results of operations.
See Recent Accounting Pronouncements issued, not yet adopted under Note 3 – Summary of Significant Accounting Policies in the notes to the 2023 consolidated financial statements for more information about recent accounting pronouncements, the timing of their adoption and our assessment, to the extent we have made one, of their potential impact on our financial condition and results of operations.
We do not offer any sales returns. Amounts billed to customers related to shipping and handling are classified as revenue, and we have elected to recognize the cost for freight and shipping when control has transferred to the customer as a cost of revenue. Our policy is to exclude taxes collected from customers from the transaction price of contracts.
We did not offer any sales returns. Amounts billed to customers related to shipping and handling were classified as revenue, and we have elected to recognize the cost for freight and shipping when control has transferred to the customer as a cost of revenue. Our policy is to exclude taxes collected from customers from the transaction price of contracts.
We recognize revenue on Hybrid system sales and Class 8 semi-trucks outfitted with Hybrid systems upon delivery to, and acceptance of the vehicle by, the customer, which is when control transfers. Contracts are reviewed for significant financing components and payments are typically received within 30 days of delivery.
We recognized revenue on Hybrid system sales and Class 8 semi-trucks outfitted with Hybrid systems upon delivery to, and acceptance of the vehicle by, the customer, which is when control transfers. Contracts were reviewed for significant financing components and payments were typically received within 30 days of delivery.
Research and Development Expense Research and development expenses consist primarily of costs incurred for the discovery and development of our electrified powertrain solutions, which include: • personnel-related expenses including salaries, benefits, travel and share-based compensation, for personnel performing research and development activities; • fees paid to third parties such as contractors for outsourced engineering services and to consultants; • expenses related to truck components for development and test vehicles, materials, supplies and other third-party services; • depreciation for equipment used in research and development activities; • acquired in-process research and development from asset acquisition; and • allocation of general overhead costs.
Research and Development Expense Research and development expenses consist primarily of costs incurred for the discovery and development of our KARNO stationary generator and electrified powertrain solutions, which include: • personnel-related expenses including salaries, benefits, travel and share-based compensation, for personnel performing research and development activities; • fees paid to third parties such as contractors for outsourced engineering services and to consultants; • expenses related to components for development and testing, materials, supplies and other third-party services; • depreciation for equipment used in research and development activities; • acquired in-process research and development from asset acquisition; and • allocation of general overhead costs.
We consider factors such as, but not limited to, which entity has the primary responsibility for fulfilling the promise to provide the specified good or service, which entity has inventory risk before the specified good or service has been transferred to a customer and which entity has discretion in establishing the price for the specified good or service.
We considered factors such as, but not limited to, which entity had the primary responsibility for fulfilling the promise to provide the specified good or service, which entity had inventory risk before the specified good or service had been transferred to a customer and which entity had discretion in establishing the price for the specified good or service.
The Company’s products are marketed and sold to end-user fleet customers in North America. When our contracts with customers contain multiple performance obligations and where material, the contract transaction price is allocated on a relative standalone selling price basis to each performance obligation.
The Company’s products were marketed and sold to end-user fleet customers in North America. When our contracts with customers contained multiple performance obligations and where material, the contract transaction price was allocated on a relative standalone selling price basis to each performance obligation.
“Risk Factors.” During the periods presented, we did not have any relationships with unconsolidated organizations or financial partnerships, such as structured finance or special purpose entities, which were established for the purpose of facilitating off-balance sheet arrangements.
During the periods presented, we did not have any relat ionships with unconsolidated organizations or financial partnerships, such as structured finance or special purpose entities, which were established for the purpose of facilitating off-balance sheet arrangements.
Revenue Recognition Revenue is comprised of sales of Hybrid systems for Class 8 semi-trucks, Class 8 semi-trucks outfitted with Hybrid systems and specific other features and services that meet the definition of a performance obligation, including internet connectivity and data processing. We provide installation services for the Hybrid system onto the customers’ vehicle.
Revenue Recognition Revenue was historically comprised of sales of Hybrid systems for Class 8 semi-trucks, Class 8 semi-trucks outfitted with Hybrid systems and specific other features and services that met the definition of a performance obligation, including internet connectivity and data processing. We provided installation services for the Hybrid system onto the customers’ vehicle.
The sale of a Hybrid system to an end-use fleet customer consists of a completed modification to the customer vehicle and the installation services involve significant integration of the Hybrid system with the customer’s vehicle. Installation services are not distinct within the context of the contract and together with the sale of the Hybrid system represent a single performance obligation.
The sale of a Hybrid system to an end-use fleet customer consisted of a completed modification to the customer vehicle and the installation services involved significant integration of the Hybrid system with the customer’s vehicle. Installation services were not distinct within the context of the contract and together with the sale of the Hybrid system represented a single performance obligation.
Cash Flows Net cash, cash equivalents and restricted cash provided by or used in operating activities, investing activities and financing activities for is summarized as follows for the periods indicated and should be read in conjunction with our consolidated financial statements and the notes thereto included in Part II, Item 8 of this Annual Report on Form 10-K (in thousands): Year Ended December 31, 2022 2021 Cash from operating activities $ (116,877) $ (80,502) Cash from investing activities (22,022) (65,991) Cash from financing activities (78) 15,898 $ (138,977) $ (130,595) Cash from Operating Activities For the year ended December 31, 2022, cash flows used in operating activities were $116.9 million.
Cash Flows Net cash, cash equivalents and restricted cash provided by or used in operating activities, investing activities and financing activities is summarized as follows for the periods indicated and should be read in conjunction with our consolidated financial statements and the notes thereto included in Part II, Item 8 of this Annual Report on Form 10-K (in thousands): Year Ended December 31, 2023 2022 Cash from operating activities $ (116,962) $ (116,877) Cash from investing activities 18,308 (22,022) Cash from financing activities (15) (78) $ (98,669) $ (138,977) Cash from Operating Activities For the year ended December 31, 2023, cash flows used in operating activities were $117.0 million.
Contractual Obligations and Capital Resources We manage our use of cash in the operation of our business to support the execution of our primary strategic goals including the design, development and sale of electrified powertrain systems for long haul Class 8 semi-trucks. We primarily use cash for research and development activities, capital investments and general and administrative costs.
Contractual Obligations and Capital Resources We manage our use of cash in the operation of our business to support the execution of our primary strategic goals including the design, development and sale of the KARNO generator. We primarily use cash for research and development activities, capital investments and general and administrative costs.
The increase in cost of revenues includes: • Inventory write-downs of $3.2 million attributable to inventory on hand that had a cost higher than its expected net realizable value; • Costs associated with sales of Hybrid systems and class 8 semi-trucks of $2.2 million; and • Warranty costs of $0.6 million for estimated costs to administer and maintain the warranty program for labor, transportation and parts, excluding any contribution from vendors.
The decrease in cost of revenues includes: • A decrease in inventory write-downs of $4.5 million attributable to inventory on hand that had a cost higher than its expected net realizable value as we purchased less inventory in the current year; • A decrease in costs associated with sales of Hybrid systems of $2.2 million; and • A decrease in warranty costs of $0.4 million for estimated costs to administer and maintain the warranty program for labor, transportation and parts, excluding any contribution from vendors as we sold fewer Hybrid systems in the current year.
Should product failure rates and fulfillment costs differ from these estimates, material revisions to the estimated warranty liability would be required. Warranty expense is recorded as a component of cost of revenue.
We recognize the cost of the warranty upon transfer of control based on estimated and historical claims rates and fulfillment costs, which are variable. Should product failure rates and fulfillment costs differ from these estimates, material revisions to the estimated warranty liability would be required. Warranty expense is recorded as a component of cost of revenue.
The amount and timing of our future funding requirements, if any, will depend on many factors, including the pace and results of our research and development efforts, the breadth of product offerings we plan to commercialize, the pace of sales and production growth, as well as factors that are outside of our control.
“Risk Factors.” The amount and timing of our future funding requirements, if any, will depend on many factors, including the pace and results of our research and development efforts, the breadth of product offerings we plan to commercialize, the pace of sales, and our long-term plan manufacturing plan for the KARNO generator including plans for financing additive printer investments, as well as factors that are outside of our control.
For the year ended December 31, 2021, cash flows used in operating activities were $80.5 million.
For the year ended December 31, 2022, cash flows used in operating activities were $116.9 million.
Cash flows were primarily due to payment of taxes related to net share settlement of equity awards of $0.2 million. For the year ended December 31, 2021, cash flows provided by financing activities were $15.9 million.
Cash from Financing Activities For the year ended December 31, 2023, cash flows used in financing activities were nil. For the year ended December 31, 2022, cash flows used in financing activities were $0.1 million. Cash flows were primarily due to payment of taxes related to net share settlement of equity awards of $0.2 million.
During the fourth quarter of 2021, we changed from a research and development phase to a production phase for our Hybrid system product.
During the fourth quarter of 2021, we changed from a research and development phase to a production phase for our Hybrid system product. Through December 31, 2023, we have not yet commercialized the KARNO generator.
Our current liabilities were $14.7 million primarily comprised of accounts payable, accrued expenses and operating lease liabilities. We believe the credit quality and liquidity of our investment portfolio as of December 31, 2022 is strong and will provide sufficient liquidity to satisfy operating requirements, working capital purposes and strategic initiatives.
We believe the credit quality and liquidity of our investment portfolio at December 31, 2023 is strong and will provide sufficient liquidity to satisfy operating requirements, working capital purposes and strategic initiatives.
Future share-based compensation cost will increase to the extent that we grant additional share-based awards to employees and nonemployees. If there are any modifications or cancellations of the underlying unvested securities, we may be required to accelerate any remaining unearned share-based compensation cost or incur incremental cost.
If there are any modifications or cancellations of the underlying unvested securities, we may be required to accelerate any remaining unearned share-based compensation cost or incur incremental cost. Share-based compensation cost affects our research and development and selling, general and administrative expenses.
We expect to continue to invest in research and development activities to achieve operational and commercial goals and as we develop new platforms that incorporate our Hypertruck ERX system.
We expect to continue to invest in research and development activities to achieve operational and commercial goals.
Further, we plan to develop and commercialize the fuel agnostic Hypertruck KARNO with an anticipated commercial launch a few years after the Hypertruck ERX. However, actual results could vary materially and negatively as a result of a number of factors including, but not limited to, those discussed in Part I, Item 1A.
However, actual results could vary materially and negatively as a result of a number of factors including, but not limited to, those discussed in Part I, Item 1A.
Certain costs incurred for components acquired prior to our determination of reaching a commercial stage were previously expensed as research and development costs, resulting in zero cost basis for those components, which affected the 32 Table of Contents moving-average price.
Costs incurred for components acquired prior to our determination of reaching a commercial stage are expensed as research and development 26 Table of Contents costs, resulting in zero cost basis for those components. As a result, moving-average prices for inventory that is capitalized in future periods may be significantly affected by those zero cost items.
Cash used primarily related to a net loss of $96.0 million, adjusted for $4.2 million changes in working capital accounts and $11.4 million in certain non-cash expense (including $4.9 million related to share-based compensation, $2.3 million related to inventory write-downs, $1.8 million related to amortization of investment premiums and discounts, $0.9 million related to depreciation and amortization, $0.7 million related to non-cash lease expense and $0.7 million related to loss on impairment or disposal of assets).
Cash used primarily related to a net loss of $123.5 million, adjusted for $2.9 million change in working capital accounts and $9.5 million in certain non-cash expenses (including $6.2 million related to share-based compensation, $1.1 million related to inventory write-downs and $0.6 million related to depreciation, amortization and accretion charges).
In the fourth quarter of fiscal 2021, we began taking deposits to secure future Hypertruck ERX production slots. When a Class 8 semi-truck outfitted with a Hybrid system is resold to a customer, judgment is required to determine if we are the principal or agent in the arrangement.
When a Class 8 semi-truck outfitted with a Hybrid system was resold to a customer, judgment was required to determine if we were the principal or agent in the arrangement.
We have limited sales history of our Hybrid systems and therefore are required to make certain estimates and assumptions with regard to the recognition of revenue including, among other things, the value of any future performance obligations. We expect to refine our sales processes, contracts and services as our business matures.
We have determined that we were the principal in transactions involving the resale of Class 8 semi-trucks outfitted with the Hybrid system. We had limited sales history of our Hybrid systems and therefore were required to make certain estimates and assumptions with regard to the recognition of revenue including, among other things, the value of any future performance obligations.
Our cash requirements beyond twelve months include: • Operating and Finance Leases — Refer to Note 11 of the notes to the consolidated financial statements for further information of our obligations and the timing of expected payments. • Warranties — Refer to Note 15 of the notes to the consolidated financial statements for further information of our obligations.
Our cash requirements beyond twelve months include: • Leases — Refer to Note 9 of the notes to the consolidated financial statements for further information of our obligations and the timing of expected payments. • Purchase Commitments — Purchase obligations include non-cancelable purchase commitments related to materials purchase agreements and volume commitments which are entered into from time to time.
Semi-truck inventory is valued using the specific identification cost method and all other inventory is valued using the moving-average cost method. Inventory is stated at the lower of cost or net realizable value. We review our inventory to determine whether its carrying value exceeds the net amount realizable we expect to receive upon the ultimate sale of the inventory.
We review our inventory to determine whether its carrying value exceeds the net amount realizable we expect to receive upon the ultimate sale of the inventory.
Cash used primarily related to the purchase of investments totaling $317.8 million, partially offset by the sale or maturity of investments of $254.2 million. Cash from Financing Activities For the year ended December 31, 2022, cash flows used in financing activities were $0.1 million.
Cash from Investing Activities For the year ended December 31, 2023, cash flows provided by investing activities were $18.3 million. Cash used primarily related to the purchase of investments totaling $189.7 million and property and equipment of $7.4 million, offset by the sale or maturity of investments of $215.4 million.
Research and Development Research and development expenses increased $52.1 million primarily due to: • $28.8 million related to acquisition of hydrogen and fuel agnostic capable generator technology (“KARNO”) in September 2022 from General Electric Company's GE Additive business to develop and commercialize the fuel-agnostic Hypertruck KARNO; • An increase of $19.0 million for the design and testing of our Hypertruck ERX system including an increase in expenses related to components, services and personnel as we build out our engineering, operations and supply chain teams and associated capabilities; and 29 Table of Contents • An increase of $3.4 million for the design and testing of our Hypertruck KARNO system.
Research and Development Research and development expenses decreased $28.1 million due to: • A decrease of $28.8 million related to KARNO technology acquired in September 2022 from General Electric Company’s GE Additive business to develop and commercialize the fuel agnostic KARNO generator; and • A decrease of $13.4 million for the design and testing of our Hypertruck ERX system; offset by • An increase of $14.1 million for the design and testing of our KARNO stationary generator. 23 Table of Contents Selling, General and Administrative Selling, general, and administrative expenses increased $0.6 million primarily due to: • An increase of $1.3 million in professional services and other one-time charges; and • An increase of $1.2 million in personnel and benefits, offset by costs related to the prior-year departure of our previous Chief Financial Officer; partially offset by • A decrease of $2.3 million for insurance costs.
We expect to continue to incur net losses in the short term, as we continue to execute on our strategic initiatives by (i) completing the development and commercialization of the electrified drive systems for Class 8 semi-trucks, (ii) scaling the Company’s operations to meet anticipated demand and (iii) hiring personnel.
We expect to continue to incur net losses in the short term, as we continue to execute on our strategic initiatives by completing the development and commercialization of the KARNO generator with anticipated initial customer deployments in late 2024.
Due to this, as well as our overall profitability estimate as noted above, we have recorded a full valuation allowance related to our net operating loss carryforwards and other deferred tax assets due to the uncertainty of the ultimate realization of the future benefits of those assets. 33 Table of Contents New and Recently Adopted Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) or other standard setting bodies that are adopted by us as of the specified effective date.
New and Recently Adopted Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) or other standard setting bodies that are adopted by us as of the specified effective date.
Key Factors Affecting Operating Results We believe that our performance and future success depend on several factors that present significant opportunities for us but also pose risks and challenges, including but not limited to those discussed below and in Item 1A “Risk Factors”.
We do not undertake, and expressly disclaim, any obligation to publicly update any forward-looking statements, whether as a result of new information, new developments or otherwise, except to the extent that such disclosure is required by applicable law. 20 Table of Contents Key Factors Affecting Operating Results We believe that our performance and future success depend on several factors that present significant opportunities for us but also pose risks and challenges, including but not limited to current economic uncertainties, supply chain disruptions, inflation and high interest rates as well as those discussed below and referenced in Item 1A “Risk Factors”.
The warranty period typically extends for the lesser of two years or 200,000 miles following transfer of control and solely relates to correction of product defects during the warranty period. We recognize the cost of the warranty upon transfer of control based on estimated and historical claims rates and fulfillment costs, which are variable.
Warranties We historically provided limited assurance-type warranties under our contracts and do not offer extended warranties. We plan to continue to service legacy warranties through their remaining term. The warranty period typically extends for the lesser of two years or 200,000 miles following transfer of control and solely relates to correction of product defects during the warranty period.
At December 31, 2022, we had federal net operating loss carryforwards of $229.5 million and state net operating loss carryforwards of $12.5 million that expire in various years starting in 2036. The Company also has R&D credits of $4.1 million that begin to expire in 2037.
Incom e Taxes We recognize deferred taxes for temporary differences between the basis of assets and liabilities for financial statement and income tax purposes. At December 31, 2023, we had federal net operating loss carryforwards of $297.9 million and state net operating loss carryforwards of $12.5 million that expire in various years starting in 2036.
Cash flows were primarily due to proceeds from the exercise of warrants of $16.3 million and proceeds from the exercise of common stock options of $0.6 million, partially offset by repayment of $0.9 million from a Paycheck Protection Program loan. 30 Table of Contents Liquidity and Capital Resources At December 31, 2022, our current assets were $324.2 million, consisting primarily of cash and cash equivalents of $119.5 million, short-term investments of $193.7 million, and prepaid expenses of $9.8 million.
Liquidity and Capital Resources At December 31, 2023, our current assets were $181.7 million, consisting primarily of cash and cash equivalents of $12.9 million, short-term investments of $150.3 million, and prepaid expenses of $18.5 million. Our current liabilities were $15.1 24 Table of Contents million primarily comprised of accounts payable, accrued expenses and operating lease liabilities.
We anticipate that a substantial portion of our capital resources and efforts in the near future will be focused on the continued development and commercialization of our drivetrain solutions and for working capital purposes as we ramp up production volumes of the Hypertruck ERX system.
Successful Commercialization of KARNO Generator Our focus in the fourth quarter of 2023 was on continuing development and testing of our fuel-agnostic KARNO stationary generator and deploying initial revenue-generating units with customers in 2024. We anticipate that a substantial portion of our capital resources and efforts in the near future will be focused these activities.
Other Income (Expense) Total other income increased $5.6 million primarily due to: • An increase of $4.9 million in interest income on investments; and • A loss on impairment and disposal of assets of $0.7 million for the year ended December 31, 2021.
Exit and Termination Costs Exit and termination costs of $11.5 million were a result of the strategic plan and items discussed in Note 2 of the notes to the consolidated financial statements. Other Income (Expense ) Total other income increased $8.2 million prim arily due to an increase in interest income on investments.