Biggest changeThe accounting policies are described in Note 2 “Summary of Significant Accounting Policies” in our consolidated financial statements included in this Annual Report on Form 10-K. Year ended December 31, 2022 2021 2020 % of % of % of (in thousands) Dollars revenue Dollars revenue Dollars revenue Revenue: Product $ 50,263 68.5 % $ 47,868 76.5 % $ 38,347 82.9 % Software and other services 23,127 31.5 14,697 23.5 7,905 17.1 Total revenue 73,390 100.0 62,565 100.0 46,252 100.0 Cost of revenue: Product 26,804 36.5 29,308 46.8 46,294 100.1 Software and other services 7,126 9.7 2,238 3.6 1,068 2.3 Loss on product purchase commitments — — 13,965 22.3 60,113 130.0 Total cost of revenue 33,930 46.2 45,511 72.7 107,475 232.4 Gross profit (loss) 39,460 53.8 17,054 27.3 (61,223) (132.4) Operating expenses: Research and development 89,121 121.4 74,461 119.0 49,738 107.5 Sales and marketing 59,888 81.6 49,604 79.3 26,263 56.8 General and administrative 83,471 113.7 85,717 137.0 24,395 52.7 Total operating expenses 232,480 316.8 209,782 335.3 100,396 217.1 Loss from operations (193,020) (263.0) (192,728) (308.0) (161,619) (349.4) Interest income 3,384 4.6 2,573 4.1 285 0.6 Interest expense (2) (0.0) (651) (1.0) (1,141) (2.5) Change in fair value of warrant liabilities 20,859 28.4 161,095 257.5 — — Other income (expense), net 98 0.1 (2,577) (4.1) (231) (0.5) Loss before provision for income taxes (168,681) (229.8) (32,288) (51.6) (162,706) (351.8) Provision for income taxes 42 0.1 121 0.2 39 0.1 Net loss $ (168,723) (229.9) % $ (32,409) (51.8) % $ (162,745) (351.9) % Comparison of the Years Ended December 31, 2022 and 2021 Revenue Year ended December 31, (in thousands) 2022 2021 Change % Change Revenue: Product $ 50,263 $ 47,868 $ 2,395 5.0 % Software and other services 23,127 14,697 8,430 57.4 % Total revenue: $ 73,390 $ 62,565 $ 10,825 17.3 % 72 Table of Contents Product revenue increased by $2.4 million, or 5.0%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
Biggest changeThe accounting policies are described in Note 2 “Summary of Significant Accounting Policies” in our consolidated financial statements included in this Annual Report on Form 10-K. 51 Table of Contents Year ended December 31, 2023 2022 2021 % of % of % of (in thousands) Dollars revenue Dollars revenue Dollars revenue Revenue: Product $ 40,036 60.8 % $ 50,263 68.5 % $ 47,868 76.5 % Software and other services 25,864 39.2 23,127 31.5 14,697 23.5 Total revenue 65,900 100.0 73,390 100.0 62,565 100.0 Cost of revenue: Product 40,655 61.7 26,804 36.5 29,308 46.8 Software and other services 8,389 12.7 7,126 9.7 2,238 3.6 Loss on product purchase commitments — — — — 13,965 22.3 Total cost of revenue 49,044 74.4 33,930 46.2 45,511 72.7 Gross profit 16,856 25.6 39,460 53.8 17,054 27.3 Operating expenses: Research and development 55,616 84.4 88,044 120.0 74,461 119.0 Sales and marketing 39,073 59.3 59,494 81.1 49,604 79.3 General and administrative 49,613 75.3 77,596 105.7 85,717 137.0 Other 18,164 27.6 7,346 10.0 — — Total operating expenses 162,466 246.5 232,480 316.8 209,782 335.3 Loss from operations (145,610) (221.0) (193,020) (263.0) (192,728) (308.0) Interest income 7,450 11.3 3,384 4.6 2,573 4.1 Interest expense — — (2) (0.0) (651) (1.0) Change in fair value of warrant liabilities 4,544 6.9 20,859 28.4 161,095 257.5 Other income (expense), net (2) (0.0) 98 0.1 (2,577) (4.1) Loss before provision for income taxes (133,618) (202.8) (168,681) (229.8) (32,288) (51.6) Provision for income taxes 82 0.1 42 0.1 121 0.2 Net loss and comprehensive loss $ (133,700) (202.9) % $ (168,723) (229.9) % $ (32,409) (51.8) % Comparison of the Years Ended December 31, 2023 and 2022 Revenue Year ended December 31, (in thousands) 2023 2022 Change % Change Product $ 40,036 $ 50,263 $ (10,227) (20.3) % Software and other services 25,864 23,127 2,737 11.8 $ 65,900 $ 73,390 $ (7,490) (10.2) % Product revenue decreased by $10.2 million, or 20.3%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
Our Ultrasound-on-Chip™ makes ultrasound more accessible outside of large healthcare institutions, while our software is intended to make the product easy to use and fully integrated with the clinical workflow, accessible on a user’s smartphone, tablet and almost any hospital computer system connected to the Internet.
Our Ultrasound-on-Chip™ makes ultrasound more accessible outside of large healthcare institutions, while our software is intended to make the product easy to use, fully integrated with the clinical workflow, and accessible on a user’s smartphone, tablet, and almost any hospital computer system connected to the Internet.
This increase was primarily driven by a higher volume of SaaS subscriptions sold in conjunction with new device sales, current year subscription renewals and expanded service offerings. Cost of revenue Year ended December 31, (in thousands) 2022 2021 Change % Change Cost of revenue: Product $ 26,804 $ 29,308 $ (2,504) (8.5) % Software and other services 7,126 2,238 4,888 218.4 % Loss on product purchase commitments — 13,965 (13,965) (100.0) % Total cost of revenue: $ 33,930 $ 45,511 $ (11,581) (25.4) % Percentage of revenue 46.2 % 72.7 % Cost of product revenue decreased by $2.5 million, or 8.5%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
This increase was primarily driven by a higher volume of SaaS subscriptions sold in conjunction with new device sales, current year subscription renewals and expanded service offerings. Cost of revenue Year ended December 31, (in thousands) 2022 2021 Change % Change Product $ 26,804 $ 29,308 $ (2,504) (8.5) % Software and other services 7,126 2,238 4,888 218.4 Loss on product purchase commitments — 13,965 (13,965) (100.0) $ 33,930 $ 45,511 $ (11,581) (25.4) % Percentage of revenue 46.2 % 72.7 % Cost of product revenue decreased by $2.5 million, or 8.5%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
Our future spending on capital resources may vary from those currently planned and will depend on various factors, including our rate of revenue growth and the timing and extent of spending on strategic business initiatives. We have restricted cash of $4.0 million as of December 31, 2022 to secure a letter of credit for one of our leases, which is expected to be maintained as a security deposit for the duration of the lease.
Our future spending on capital resources may vary from those currently planned and will depend on various factors, including our rate of revenue growth and the timing and extent of spending on strategic business initiatives. We have restricted cash of $4.0 million as of December 31, 2023 to secure a letter of credit for one of our leases, which is expected to be maintained as a security deposit for the duration of the lease.
Personnel costs increased by $7.8 million due to having a higher headcount in 2022 than 2021, primarily comprised of increases in salaries and bonuses of $6.9 million. Travel and entertainment costs increased by $2.1 million as our salesforce increased its in-person engagement with our customers and attendance at sales conferences and events.
Personnel costs increased by $7.4 million due to having a higher headcount in 2022 than 2021, primarily comprised of increases in salaries and bonuses of $6.9 million. Travel and entertainment costs increased by $2.1 million as our salesforce increased its in-person engagement with our customers and attendance at sales conferences and events.
Manufacturing overhead costs are capitalized to inventory and are recognized as cost of revenues in future periods based on our rate of inventory turnover. Recently Adopted Accounting Pronouncements A description of recently issued accounting pronouncements that may potentially impact our financial position and results of operations is disclosed in Note 2 “Summary of Significant Accounting Policies – Recent Accounting Pronouncements Adopted” to our consolidated financial statements contained in this Annual Report on Form 10-K.
Manufacturing overhead costs are capitalized to inventory and are recognized as cost of revenues in future periods based on our rate of inventory turnover. 59 Table of Contents Recently Adopted Accounting Pronouncements A description of recently issued accounting pronouncements that may potentially impact our financial position and results of operations is disclosed in Note 2 “Summary of Significant Accounting Policies – Recent Accounting Pronouncements Adopted” to our consolidated financial statements contained in this Annual Report on Form 10-K.
The increase was primarily due to an increase of $73.5 million in purchases and sales of marketable securities and an increase in purchases of property and equipment of $10.4 million related to the Company’s new office space and additional investments into our software platform. Cash flows provided by financing activities Net cash provided by financing activities decreased by $562.8 million, or 99.5%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
The increase was primarily due to an increase of $73.5 million in purchases and sales of marketable securities and an increase in purchases of property and equipment of $10.4 million related to the Company’s new office space and additional investments into our software platform. 57 Table of Contents Cash flows provided by financing activities Net cash provided by financing activities decreased by $562.8 million, or 99.5%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
We expect our cost of product revenue to fluctuate over time due to the level of units fulfilled in any given period and fluctuate as a percentage of product revenue over time as our focus on operational efficiencies in our supply chain may be offset by increased prices of certain inventory components. Cost of software and other services revenue consists of personnel costs, cloud hosting costs and payment processing fees.
We expect our cost of product revenue to fluctuate over time due to the level of units fulfilled in any given period and fluctuate 50 Table of Contents as a percentage of product revenue over time as our focus on operational efficiencies in our supply chain may be offset by increased prices of certain inventory components. Cost of software and other services revenue consists of personnel costs, cloud hosting costs and payment processing fees.
Our software subscriptions and extended warranties are stand-ready obligations that are satisfied over time, and we use the time-elapsed (i.e., straight-line) measure of progress 78 Table of Contents to recognize revenue for these services.
Our software subscriptions and extended warranties are stand-ready obligations that are satisfied over time, and we use the time-elapsed (i.e., straight-line) measure of progress to recognize revenue for these services.
We consider a variety of factors and data points when determining the existence and scope of a loss for the minimum purchase commitment. The factors and data points include Company-specific forecasts which are reliant on our limited sales history, agreement-specific provisions, macroeconomic factors and market and industry trends.
We consider a variety of factors and data points when determining the existence and scope of a loss for the minimum purchase commitment. The factors and data points include Company-specific forecasts which are reliant on our limited sales history, agreement-specific provisions, macroeconomic factors and market and industry trends. Determining the loss is subjective and requires significant management judgment and estimates.
These increases in sales and marketing expenses were partially offset by decreased digital and social marketing expenses of $1.5 million as we shifted our strategic focus from the eCommerce channel to our direct sales channel. General and administrative Year ended December 31, (in thousands) 2022 2021 Change % Change General and administrative $ 83,471 $ 85,717 $ (2,246) (2.6) % Percentage of revenue 113.7 % 137.0 % General and administrative expenses decreased by $2.2 million, or 2.6%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
These increases in sales and marketing expenses were partially offset by decreased digital and social marketing expenses of $1.5 million as we shifted our strategic focus from the eCommerce channel to our direct sales channel. General and administrative Year ended December 31, (in thousands) 2022 2021 Change % Change General and administrative $ 77,596 $ 85,717 $ (8,121) (9.5) % Percentage of revenue 105.7 % 137.0 % General and administrative expenses decreased by $8.1 million, or 9.5%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
We view software and other services mix as a key indicator of the profitability of our business, and thus we believe that this measure is useful to investors. Software and other services mix increased by 9.2 percentage points, to 33.3% for the three months ended December 31, 2022 compared to the three months ended December 31, 2021.
We view software and other services mix as a key indicator of the profitability of our business, and thus we believe that this measure is useful to investors. 49 Table of Contents Software and other services mix increased by 5.2 percentage points, to 38.5% for the three months ended December 31, 2023 compared to the three months ended December 31, 2022.
We believe that this measure is useful to investors because it presents our core growth and performance of our business period over period. 69 Table of Contents Units fulfilled decreased by 955, or 14.2%, for the three months ended December 31, 2022 compared to the three months ended December 31, 2021, primarily due to decreased device sales volume from our direct sales and eCommerce channels.
We believe that this measure is useful to investors because it presents our core growth and performance of our business period over period. Units fulfilled decreased by 1,498, or 26.0%, for the three months ended December 31, 2023 compared to the three months ended December 31, 2022, primarily due to decreased device sales volume from our direct sales and eCommerce channels.
We expect to pay for approximately 40% of these purchase obligations payable within the next 12 months using vendor advances. As of December 31, 2022, we had no obligations, assets or liabilities, which would be considered off-balance sheet arrangements. 76 Table of Contents Cash Flows The following table summarizes our sources and uses of cash for the years ended December 31, 2022, 2021 and 2020: Year ended December 31, (in thousands) 2022 2021 2020 Net cash used in operating activities $ (169,115) $ (189,187) $ (81,700) Net cash used in investing activities (93,779) (9,870) (2,376) Net cash provided by financing activities 2,881 565,692 54,280 Net (decrease) increase in cash, cash equivalents and restricted cash $ (260,013) $ 366,635 $ (29,796) Comparison of the period for the years ended December 31, 2022 and 2021 Cash flows used in operating activities Net cash used in operating activities represents the cash receipts and disbursements related to our activities other than investing and financing activities.
We expect to pay for approximately 21% of the amount payable within the next 12 months using vendor advances. As of December 31, 2023, we had no obligations, assets or liabilities, which would be considered off-balance sheet arrangements. Cash Flows The following table summarizes our sources and uses of cash for the years ended December 31, 2023, 2022 and 2021: Year ended December 31, (in thousands) 2023 2022 2021 Net cash used in operating activities $ (98,820) $ (169,115) $ (189,187) Net cash provided by (used in) investing activities 70,414 (93,779) (9,870) Net cash provided by financing activities 228 2,881 565,692 Net decrease in cash, cash equivalents and restricted cash $ (28,178) $ (260,013) $ 366,635 56 Table of Contents Comparison of the period for the years ended December 31, 2023 and 2022 Cash flows used in operating activities Net cash used in operating activities represents the cash receipts and disbursements related to our activities other than investing and financing activities.
Determining the loss is subjective and requires significant management judgment and estimates. Research and development R&D expenses primarily consist of personnel costs and benefits, facilities-related expenses, depreciation expense, consulting and professional fees, fabrication services, software and other outsourcing expenses.
Determining the loss is subjective and requires significant management judgment and estimates. Research and development Research and development expenses primarily consist of personnel costs and benefits, facilities-related expenses and depreciation, fabrication services, and software costs.
Engineering costs increased by $1.8 million, primarily due to increased spending on new product design and development. 73 Table of Contents Sales and marketing Year ended December 31, (in thousands) 2022 2021 Change % Change Sales and marketing $ 59,888 $ 49,604 $ 10,284 20.7 % Percentage of revenue 81.6 % 79.3 % Sales and marketing expenses increased by $10.3 million, or 20.7%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
Engineering costs increased by $1.8 million, primarily due to increased spending on new product design and development. . Sales and marketing Year ended December 31, (in thousands) 2022 2021 Change % Change Sales and marketing $ 59,494 $ 49,604 $ 9,890 19.9 % Percentage of revenue 81.1 % 79.3 % Sales and marketing expenses increased by $9.8 million, or 19.9%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
We expect cash provided by historical financing activities will continue to be our primary source of funds to support operating needs and capital expenditures for the foreseeable future. Net cash used in operating activities increased by $107.5 million, or 131.6%, for the year ended December 31, 2021 compared to the year ended December 31, 2020.
We expect cash provided by historical financing activities will continue to be our primary source of funds to support operating needs and capital expenditures for the foreseeable future. Net cash used in operating activities decreased by $70.3 million, or 41.6%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
Most of our R&D expenses are related to developing new products and services, which we define as not having reached the point of commercialization, and improving our products and services that have been commercialized. Consulting expenses are related to general development activities and clinical/regulatory research. Fabrication services include certain third-party engineering costs, product testing and test boards.
Most of our research and development expenses are related to developing new products and services that have not reached the point of commercialization and improving our products and services that have been commercialized. Fabrication services include certain third-party engineering costs, product testing, and test boards. Research and development expenses are expensed as incurred.
Determining the loss is subjective and requires 79 Table of Contents significant management judgment and estimates. Future events may differ from those assumed in our assessment, and therefore the loss may change in the future. We capitalize manufacturing overhead expenditures as part of inventory costs.
Future events may differ from those assumed in our assessment, and therefore the loss may change in the future. We capitalize manufacturing overhead expenditures as part of inventory costs.
We expect to continue to make substantial investments in our product development, clinical and regulatory capabilities. 71 Table of Contents Sales and marketing Sales and marketing expenses primarily consist of personnel costs and benefits, third party logistics, fulfillment and outbound shipping costs, advertising, promotional costs, conferences and events and related facilities and information technology costs.
We expect to continue to make substantial investments in our product and software development, clinical, and regulatory capabilities. Sales and marketing Sales and marketing expenses primarily consist of personnel costs and benefits, advertising, conferences and events, facilities-related expenses, and software costs. We expect to continue to make substantial investments in our sales capabilities.
The loss on product purchase commitments did not recur in 2022. Research and development Year ended December 31, (in thousands) 2022 2021 Change % Change Research and development $ 89,121 $ 74,461 $ 14,660 19.7 % Percentage of revenue 121.4 % 119.0 % Research and development expenses increased by $14.7 million, or 19.7%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
The loss on product purchase commitments did not recur in 2022. 54 Table of Contents Research and development Year ended December 31, (in thousands) 2022 2021 Change % Change Research and development $ 88,044 $ 74,461 $ 13,583 18.2 % Percentage of revenue 120.0 % 119.0 % Research and development expenses increased by $13.5 million, or 18.2%, for the year ended December 31, 2022 compared to the year ended December 31, 2021.
The decrease was primarily due to the non-recurrence of net proceeds from the Business Combination of $548.4 million and an $18.7 million decrease in option exercises, partially offset by the non-recurrence of the $4.4 million repayment of the Paycheck Protection Program loan. Comparison of the period for the years ended December 31, 2021 and 2020 Cash flows used in operating activities Net cash used in operating activities represents the cash receipts and disbursements related to our activities other than investing and financing activities.
The decrease was primarily due to the non-recurrence of net proceeds from exercise of stock options and warrants of $2.7 million, partially offset by $0.1 million from other financing activities. Comparison of the period for the years ended December 31, 2022 and 2021 Cash flows used in operating activities Net cash used in operating activities represents the cash receipts and disbursements related to our activities other than investing and financing activities.
Actual results and the timing of events may differ materially from those contained in these forward-looking statements due to a number of factors, including those discussed in the sections entitled “Risk Factors” and “Cautionary Statement Regarding Forward-Looking Statements” appearing elsewhere in this Annual Report on Form 10-K. 68 Table of Contents Overview We are an innovative digital health business transforming care with handheld, whole-body ultrasound.
Actual results and the timing of events may differ materially from those contained in these forward-looking statements due to a number of factors, including those discussed in the sections entitled “Risk Factors” and “Cautionary Statement Regarding Forward-Looking Statements” appearing elsewhere in this Annual Report on Form 10-K. Overview We are an innovative digital health business transforming care through a unique combination of portable, semiconductor-based ultrasound technology, intuitive software, services and educational offerings that can make medical imaging more accessible than ever before.
Personnel costs increased by $9.2 million due to having a higher headcount in 2022 than 2021, primarily comprised of increases in salaries and bonuses of $4.5 million and stock-based compensation expenses of $3.8 million as well as reduction in force related severance and benefits costs of $1.0 million that were incurred only in 2022.
This increase was primarily driven by increased personnel costs of $8.1 million due to having a higher headcount in 2022 than 2021. Personnel costs primarily comprised of increases in salaries and bonuses of $4.5 million and stock-based compensation expenses of $3.8 million.
Outside services consist of professional services, legal fees and other professional fees. Results of Operations We operate as a single reportable segment to reflect the way our chief operating decision maker reviews and assesses the performance of the business.
These other expenses primarily consist of employee severance and benefits costs related to our reductions in force, litigation costs, and legal settlements. Results of Operations We operate as a single reportable segment to reflect the way our chief operating decision maker reviews and assesses the performance of the business.
Powered by our proprietary Ultrasound-on-Chip™ technology, our solution enables the acquisition of imaging information from an affordable, powerful device that fits in a healthcare professional’s pocket with a unique combination of cloud-connected software and hardware technology that is easily accessed through a mobile app. Butterfly iQ+ is an ultrasound device that can perform whole-body imaging in a single handheld probe using semiconductor technology.
Butterfly’s solution enables the practical application of ultrasound information into the clinical workflow through affordable hardware that fits in a healthcare professional’s pocket and is paired with cloud-connected software that is easily accessed through a mobile application. Butterfly iQ+ and iQ3 are ultrasound devices that can perform whole-body imaging in a single handheld probe using semiconductor technology.
The decrease was driven by a $99.1 million increase in net working capital cash usage and an $8.5 million increase in net loss adjusted for certain noncash items, primarily driven by the change in fair value of warrant liabilities and stock-based compensation expense.
The decrease was driven by a $9.3 million decrease in net working capital cash and $60.9 million decrease in net loss adjusted for certain noncash items, primarily driven by the loss on excess inventory, the change in fair value of warrant liabilities, and net income.
We market and sell the Butterfly system, which includes probes and related accessories and software subscriptions, to healthcare systems, physicians and healthcare providers through a direct sales force, distributors and our eCommerce channel. Business Combination On February 12, 2021 we completed the Business Combination.
We market and sell the Butterfly system, which includes probes, related accessories, and software subscriptions, to healthcare systems, physicians, and healthcare providers through a direct sales force, distributors, and our eCommerce channel. In 2023 and 2022, we took significant actions to reduce our cost of operations and extend our cash runway.
This decrease was primarily due to certain unique events from 2021 not reoccurring in 2022. Stock-based compensation expense decreased by $6.9 million, primarily due to the expense recognized in 2021 for awards that vested alongside the closing of the Business Combination. Recruiting expenses decreased by $3.2 million, primarily due to the recruiting expenses incurred during our CEO transition in 2021.
This decrease was primarily due to lower stock-based compensation expense of $6.9 million as a result of the expense recognized in 2021 for awards that vested alongside the closing of the Business Combination. Consulting expenses decreased by $3.8 million as more activities were brough in-house during 2022.
Additionally, the proceeds from the exercise of stock options increased by $19.7 million, which was partially offset by a $4.4 million repayment of a loan under the Paycheck Protection Program that was issued in fiscal 2020, the non-recurrence of $50.0 million of proceeds from the issuance of convertible debt in fiscal 2020 and $4.4 million of proceeds from the loan payable issued in fiscal 2020. Critical Accounting Policies and Estimates Our consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S.
The decrease was primarily due to the non-recurrence of net proceeds from the Business Combination of $548.4 million and an $18.7 million decrease in option exercises, partially offset by the non-recurrence of the $4.4 million repayment of the Paycheck Protection Program loan. Critical Accounting Policies and Estimates Our consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S.
In addition, the increase is due to the timing of revenue 70 Table of Contents recognition for our SaaS and other software subscription contracts as revenue from such contracts is deferred and recognized over the service period. Description of Certain Components of Financial Data Revenue Revenue consists of revenue from the sale of products, such as medical devices and accessories, and the sale of software related services, classified as software and other services revenue on our consolidated statements of operations and comprehensive loss, which are SaaS subscriptions and product support and maintenance (“Support”).
For the full year 2023 versus 2022 enterprise licenses accounted for 32.9% of licenses versus 26.7% respectively. Description of Certain Components of Financial Data Revenue Revenue consists of revenue from the sale of products, such as medical devices and accessories, and the sale of software related services, classified as software and other services revenue on our consolidated statements of operations and comprehensive loss, which are SaaS subscriptions and product support and maintenance (“Support”).
We expect to be cash flow negative on an annual basis, although we may have quarterly results where cash flows from operations are positive. We expect that our existing cash and cash flows from operations will be sufficient to meet our liquidity, capital expenditure, and anticipated working capital requirements and fund our operations for at least the next 12 months. Our cash and cash equivalents and investments in marketable securities balance as of December 31, 2022 was $237.8 million.
We expect that our existing cash and cash flows from operations will be sufficient to meet our liquidity, capital expenditure, and anticipated working capital requirements and fund our operations for at least the next 12 months. During the year ended December 31, 2023, the Company utilized $103.4 million of cash, cash equivalents, and marketable securities.
We estimate variable consideration using the expected value method based on a portfolio of data from similar contracts. Stock-based compensation Our stock-based compensation program includes restricted stock units and stock option grants to our employees, directors and consultants.
We estimate variable consideration based on the individual contract characteristics or may apply a portfolio approach depending on the circumstances. 58 Table of Contents Stock-based compensation Our stock-based compensation program includes restricted stock units and stock option grants to our employees, directors and consultants.
These decreases were partially offset by increases in other personnel costs of $5.1 million due to having a higher headcount in 2022 than 2021 and increases in software costs of $1.3 million to support our internal resources as we shifted our administrative functions away from external service providers. Comparison of the Years Ended December 31, 2021 and 2020 Revenue Year ended December 31, (in thousands) 2021 2020 Change % Change Revenue: Product $ 47,868 $ 38,347 $ 9,521 24.8 % Software and other services 14,697 7,905 6,792 85.9 % Total revenue: $ 62,565 $ 46,252 $ 16,313 35.3 % Product revenue increased by $9.5 million, or 24.8%, for the year ended December 31, 2021 compared to the year ended December 31, 2020.
These decreases were partially offset by increases in other personnel costs of $4.7 million due to having a higher headcount in 2022 than 2021 and increases in software costs of $1.3 million to support our internal resources as we shifted our administrative functions away from external service providers. Other Year ended December 31, (in thousands) 2022 2021 Change % Change Other $ 7,346 $ — $ 7,346 Percentage of revenue 10.0 % — % 55 Table of Contents Other increased by $7.3 million for the year ended December 31, 2023 driven by $5.3 million of legal expenses and $2.0 million of severance expenses related to the Company’s reduction in force in July of 2022.
The increase in net working capital cash 77 Table of Contents usage was mainly due to a $65.6 million increase in cash used by accrued purchase commitments, a $30.8 million increase in cash used by accounts payable and accrued expenses and a $10.6 million increase in cash used by prepaid expenses and other assets, partially offset by a $12.2 million decrease in cash used by inventories. Cash flows used in investing activities Net cash used in investing activities increased by $7.5 million, or 315.4%, for the year ended December 31, 2021 compared to year ended December 31, 2020.
The decrease in net working capital cash usage was driven by a $17.7 million reduction in cash used for changes in our inventory and the related vendor advances and accrued purchase commitments, partially offset by a $4.5 million increase in cash used by accrued expenses and other liabilities, $2.9 million increase in cash used by operating lease assets and liabilities, and a $0.8 million increase in cash used by prepaid expenses and other assets. Cash flows used in investing activities Net cash used in investing activities decreased by $164.1 million, or 175.1%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
The quarterly revenue mix may be impacted by the timing of device sales. To date, we have invested heavily in building out our direct salesforce, with the ultimate goal of growing adoption at large-scale healthcare systems.
In 2024, due to the launch of our next generation device iQ3, we are expecting our software as a percentage of total revenue to remain flat or decrease. To date, we have invested heavily in building out our direct salesforce, with the ultimate goal of growing adoption at large-scale healthcare systems.
The restriction is expected to lapse as we fulfill our obligations in the grant agreement with BMGF. Our material cash requirements include contractual obligations with third parties for facility lease arrangements for office space and inventory supply agreements. As of December 31, 2022, we had fixed lease payment obligations of $40.6 million, with $3.5 million payable within 12 months.
In addition, we have restricted cash of $0.2 million as of December 31, 2023 for an agreement with the Gates Foundation. The restriction is expected to lapse as we fulfill our obligations in the agreement with the Gates Foundation. Our material cash requirements include contractual obligations with third parties for office leases, technology licensing agreements, and inventory supply agreements.
We continue to closely monitor the developments of COVID-19 for any material impact on our business. Key Performance Measures We review the key performance measures discussed below to evaluate the business and measure performance, identify trends, formulate plans and make strategic decisions.
As a result of the Business Combination, we received gross proceeds of approximately $589 million. 48 Table of Contents Key Performance Measures We review the key performance measures discussed below to evaluate the business and measure performance, identify trends, formulate plans and make strategic decisions.
The increase was due to increases in software subscription renewals and an expansion of software subscription offerings.
The increase was due to increases in software subscription renewals and an expansion of software subscription offerings. In addition, the increase is due to the timing of revenue recognition for our SaaS and other software subscription contracts as revenue from such contracts is deferred and recognized over the service period.
Our primary uses of liquidity are operating expenses, working capital requirements and capital expenditures. Cash flows from operations have been historically negative as we continue to develop new products and services and increase our sales and marketing efforts.
Our primary uses of liquidity are operating expenses, working capital requirements and capital expenditures. The Company has incurred net losses and negative cash flows from operating activities in each year since inception, and we expect to continue to incur losses and negative cash flows for a few years as we continue to commercialize existing and new products and services.
We expect to continue to make substantial investments in our sales capabilities. General and administrative General and administrative expenses primarily consist of personnel costs and benefits, insurance, patent fees, software costs, facilities costs and outside services.
General and administrative General and administrative expenses primarily consist of personnel costs and benefits, insurance, patent fees, software costs, facilities costs and outside services. Outside services consist of professional services, legal fees and other professional fees. Other Operating expenses classified as other are expenses which we do not consider representative of our ongoing operations.
This decrease was primarily driven by our second-generation device, the Butterfly iQ+, being less costly to produce due to operational efficiencies, partially offset by increased prices of certain inventory components. Cost of subscription revenue increased by $1.2 million, or 109.6%, for the year ended December 31, 2021 compared to the year ended December 31, 2020.
This was partially offset by lower probe volume and operating efficiencies in manufacturing Butterfly iQ+. Cost of subscription revenue increased by $1.3 million, or 17.7%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
Recruiting expenses increased by $3.5 million, professional service fees increased by $6.6 million and other costs related to becoming a public company of $3.3 million also contributed to the overall increase as we completed the Business Combination and a CEO transition in 2021. Liquidity and Capital Resources Since our inception, our primary sources of liquidity are cash flows from operations, proceeds from the Business Combination and issuances of preferred stock and convertible notes.
Expenses classified as “Other” are not representative of ongoing operations. Such expenses were insignificant for the year ended December 31, 2021. Liquidity and Capital Resources Since our inception, our primary sources of liquidity are cash flows from operations, proceeds from the Business Combination and issuances of preferred stock and convertible notes.
As of December 31, 2022, we had fixed inventory purchase obligations of $56.5 million, all of which is payable within 12 months.
Our fixed technology license payment obligations were $15.5 million as of December 31, 2023, with $1.5 million payable within the next 12 months. Our fixed purchase obligations for inventory supply agreements were $14.8 million as of December 31, 2023, with $6.8 million payable within the next 12 months.
The increase was also due to the investment activity for the funds received from the Business Combination. Cash flows provided by financing activities Net cash provided by financing activities increased by $511.4 million or 942.2%, for the year ended December 31, 2021 compared to year ended December 31, 2020.
Additionally, there was a $12.5 million decrease in purchases of fixed assets. Cash flows provided by financing activities Net cash provided by financing activities decreased by $2.6 million, or 92.1%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.