Biggest changeRESULTS OF OPERATIONS The following table shows the amounts from our consolidated statements of operations for the periods presented (in thousands, except percentages): Year Ended December 31, % of Total Revenues 2022 2021 2020 2022 2021 2020 Revenues: Product revenue $ 116,676 $ 70,657 $ 30,220 84 % 67 % 44 % Research and development revenue 21,914 34,097 38,836 16 % 33 % 56 % Total revenues 138,590 104,754 69,056 100 % 100 % 100 % Costs and operating expenses: Cost of product revenue 38,033 22,209 13,742 27 % 21 % 20 % Research and development 80,099 55,919 44,185 58 % 53 % 64 % Selling, general and administrative 52,172 49,323 35,049 38 % 47 % 51 % Restructuring charges 3,167 — — 2 % — % — % Total costs and operating expenses 173,471 127,451 92,976 125 % 121 % 135 % Loss from operations (34,881) (22,697) (23,920) (25) % (21) % (35) % Interest income 1,441 459 405 1 % — % 1 % Other income (expense), net 124 1,148 (156) — % 1 % — % Loss before income taxes (33,316) (21,090) (23,671) (24) % (20) % (34) % Provision for income taxes 276 189 339 — % — % — % Net loss $ (33,592) $ (21,279) $ (24,010) (24) % (20) % (34) % Revenues Our revenues consist of product revenue and research and development revenue as follows: • Product revenue consist of sales of biocatalysts, pharmaceutical intermediates, and Codex ® biocatalyst panels and kits. • Research and development revenue include license, technology access and exclusivity fees, research services fees, milestone payments, royalties, optimization and screening fees. 65 Revenues are as follows (in thousands, except percentages): Change Year Ended December 31, 2022 2021 2022 2021 2020 $ % $ % Product revenue $ 116,676 $ 70,657 $ 30,220 $ 46,019 65 % $ 40,437 134 % Research and development revenue 21,914 34,097 38,836 (12,183) (36) % (4,739) (12) % Total revenues $ 138,590 $ 104,754 $ 69,056 $ 33,836 32 % $ 35,698 52 % Revenues typically fluctuate on a quarterly basis due to the variability in our customers' manufacturing schedules and the timing of our customers' clinical trials.
Biggest changePotential revenues in future years from our sales of CDX-616 to Pfizer and other potential customers (including sublicensees of Pfizer technology from The Medicine Patent Pool) are subject to a number of factors which are outside of our control and could reduce or eliminate our sales of CDX-616. 49 RESULTS OF OPERATIONS The following table shows the amounts from our consolidated statements of operations for the periods presented (in thousands, except percentages): Year Ended December 31, % of Total Revenues 2023 2022 2021 2023 2022 2021 Revenues: Product revenue $ 42,906 $ 116,676 $ 70,657 61 % 84 % 67 % Research and development revenue 27,237 21,914 34,097 39 % 16 % 33 % Total revenues 70,143 138,590 104,754 100 % 100 % 100 % Costs and operating expenses: Cost of product revenue 12,809 38,033 22,209 18 % 27 % 21 % Research and development 58,885 80,099 55,919 84 % 58 % 53 % Selling, general and administrative 53,250 52,172 49,323 76 % 38 % 47 % Restructuring charges 3,284 3,167 — 5 % 2 % — % Asset impairment and other charges 9,984 — — 14 % — % — % Total costs and operating expenses 138,212 173,471 127,451 197 % 125 % 121 % Loss from operations (68,069) (34,881) (22,697) (97) % (25) % (21) % Interest income 4,172 1,441 459 6 % 1 % — % Other income (expense), net (12,274) 124 1,148 (17) % — % 1 % Loss before income taxes (76,171) (33,316) (21,090) (108) % (24) % (20) % Provision for income taxes 69 276 189 — % — % — % Net loss $ (76,240) $ (33,592) $ (21,279) (108) % (24) % (20) % Revenues Our revenues consist of product revenue and research and development revenue as follows: • Product revenue consist of sales of biocatalysts, pharmaceutical intermediates, and Codex ® biocatalyst panels and kits. • Research and development revenue include license, technology access and exclusivity fees, research services fees, milestone payments, royalties, optimization and screening fees.
You should, therefore, not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this Annual Report on Form 10-K. Business Overview We are a leading enzyme engineering company leveraging our proprietary CodeEvolver ® technology platform to discover, develop and enhance novel, high performance enzymes and other classes of proteins.
You should, therefore, not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this Annual Report on Form 10-K. Business Overview We are a leading enzyme engineering company leveraging our proprietary CodeEvolver ® technology platform to discover, develop, enhance, and commercialize novel, high performance enzymes and other classes of proteins.
We have based this estimate on assumptions that may prove to be wrong, and we could utilize our capital resources sooner than we expect. However, we may need additional capital if our current plans and assumptions change.
We have based this estimate on assumptions that may prove to be wrong, and we could utilize our capital resources sooner than we expect. 55 However, we may need additional capital if our current plans and assumptions change.
In May 2021, we entered into an Equity Distribution Agreement ("EDA") with Piper Sandler & Co ("PSC"), under which PSC, as our exclusive agent, at our discretion and at such times that we may determine from time to time, may sell over a three-year period from the execution of the EDA up to a maximum of $50.0 million of shares of our common stock.
In May 2021, we entered into an Equity Distribution Agreement (“EDA”) with Piper Sandler & Co (“PSC”), under which PSC, as our exclusive agent, at our discretion and at such times that we may determine from time to time, may sell over a three-year period from the execution of the EDA up to a maximum of $50.0 million of shares of our common stock.
Recent Accounting Pronouncements See Note 2, “Basis of Presentation and Summary of Significant Accounting Policies” in the Notes to the Consolidated Financial Statements set forth in Item 8 of this Annual Report on Form 10-K for a full description of recent accounting standards, including the respective dates of adoption and effects on our consolidated financial position, results of operations and cash flows. 77
Recent Accounting Pronouncements See Note 2, “Basis of Presentation and Summary of Significant Accounting Policies” in the Notes to the Consolidated Financial Statements set forth in Item 8 of this Annual Report on Form 10-K for a full description of recent accounting standards, including the respective dates of adoption and effects on our consolidated financial position, results of operations and cash flows. 59
If our capital resources are insufficient to meet our longer term capital requirements, and we are unable to enter into or maintain collaborations with partners that are able or willing to fund our development efforts or commercialize any products that we develop or enable, we will have to raise additional funds to continue the development of our technology and products and complete the commercialization of products, if any, resulting from our technologies.
If our capital resources are insufficient to meet our capital requirements, and we are unable to enter into or maintain collaborations with partners that are able or willing to fund our development efforts or commercialize any products that we develop or enable, we will have to raise additional funds to continue the development of our technology and products and complete the commercialization of products, if any, resulting from our technologies.
Cash Flows from Investing Activities The $7.8 million decrease in net cash used in investing activities in 2022 as compared to 2021, was primarily due to higher cash utilized for additional investments in equity securities and purchases of property and equipment in 2021.
The $7.8 million decrease in net cash used in investing activities in 2022 as compared to 2021 was primarily due to higher cash utilized for additional investments in equity securities and purchases of property and equipment in 2021.
Our need for additional capital will depend on many factors, including the financial success of our business, the spending required to develop and commercialize new and existing products, the effect of any acquisitions of other businesses, technologies or facilities that we may make or develop in the future, our spending on new market opportunities, and the potential costs for the filing, prosecution, enforcement and defense of patent claims, if necessary.
Our need for additional capital will depend on many factors, including the financial success of our business, the spending required to develop and commercialize new and existing products including our ECO Synthesis ™ manufacturing platform, the effect of any acquisitions of other businesses, technologies or facilities that we may make or develop in the future, our spending on new market opportunities, and the potential costs for the filing, prosecution, enforcement and defense of patent claims, if necessary.
We determine the stand-alone selling price ("SSP") and allocate consideration to distinct performance obligations. 75 We measure revenue based on the consideration specified in the contract with each customer, net of any sales incentives and taxes collected on behalf of government authorities.
We determine the stand-alone selling price (“SSP”) and allocate consideration to distinct performance obligations. We measure revenue based on the consideration specified in the contract with each customer, net of any sales incentives and taxes collected on behalf of government authorities.
Sales of our common stock under this arrangement could be subject to business, economic or competitive uncertainties and contingencies, many of which may be beyond our control, and which could cause actual results from the sale of our common stock to differ materially from expectations.
Sales of our common stock under this arrangement could be subject to business, economic or competitive unce rtainties and contingencies, many of which may be beyond our control, and which could cause actual results from the sale of our common stock to differ materially from expectations.
We may impair these securities and establish an allowance for a credit loss when we determine that there has been an "other-than-temporary" decline in estimated fair value of the debt or equity security compared to its carrying value.
We may impair these securities and establish an allowance for a credit loss when we determine that there has been an “other-than-temporary” decline in estimated fair value of the debt or equity security compared to its carrying value.
The increase was primarily due to an increase of $7.4 million in costs associated with higher headcount, $4.8 million in higher facilities and repair and maintenance expenses, $5.3 million increase in outside services and Chemistry, Manufacturing and Controls (“CMC”) and regulatory expenses , $2.6 million in higher lab supplies, $2.1 million in higher depreciation expenses, $1.1 million in higher stock-based compensation expenses and $0.7 million in higher allocable expenses.
The increase was primarily due to an increase of $7.4 million in costs associated with higher headcount, $4.8 million in higher facilities and repair and maintenance expenses, $5.3 million increase in outside services and CMC and regulatory expenses , $2.6 million in higher lab supplies, $2.1 million in higher depreciation expenses, $1.1 million in higher stock-based compensation expenses and $0.7 million in higher allocable expenses.
We primarily account for options which provide material rights using the alternative approach available under ASC 606, as we concluded we meet the criteria for using the alternative approach. Therefore, the transaction price is calculated as the expected consideration to be received for all the goods and services we expect to provide.
We primarily account for options which provide material rights using the alternative approach available under the Accounting Standards Codification (“ASC”) 606, as we concluded we meet the criteria for using the alternative approach. Therefore, the transaction price is calculated as the expected consideration to be received for all the goods and services we expect to provide.
Selling, General and Administrative Expenses Selling, general and administrative expenses consist of employee-related costs, which include salaries and other personnel-related expenses (including stock-based compensation), hiring and training costs, consulting and outside services expenses (including audit and legal counsel related costs), marketing costs, building lease costs, and depreciation and amortization expenses. 2022 compared to 2021 Selling, general and administrative expenses were $52.2 million in 2022 compared to $49.3 million in 2021, an increase of $2.8 million, or 6%.
Selling, General and Administrative Expenses Selling, general and administrative expenses consist of employee-related costs, which include salaries and other personnel-related expenses (including stock-based compensation), hiring and training costs, consulting and outside services expenses (including audit and legal counsel related costs), marketing costs, building lease costs, and depreciation expenses and amortization expenses. 2023 compared to 2022 Selling, general and administrative expenses were $53.3 million in 2023 compared to $52.2 million in 2022, an increase of $1.1 million, or 2%.
We believe that our existing cash and cash equivalents, combined with our future expectations for product revenues, research and development revenue, and expense management will provide adequate funds for ongoing operations, planned capital expenditures and working capital requirements for at least the next twelve months.
Liquidity We believe that our existing cash and cash equivalents, combined with our future expectations for product revenues, research and development revenue, and expense management will provide adequate funds for ongoing operations, planned capital expenditures and working capital requirement s for at least the next 12 months.
The increase in net loss was primarily related to lower research and development revenues and higher operating expenses. Net loss for 2021 was $21.3 million, or a net loss per basic and diluted share of $0.33. This compared to a net loss of $24.0 million, or $0.40 per basic and diluted share for 2020.
Net loss for 2022 was $33.6 million, or a net loss per basic and diluted share of $0.51. This compared to a net loss of $21.3 million, or $0.33 per basic and diluted share for 2021. The increase in net loss was primarily related to lower research and development revenues and higher operating expenses.
For each performance obligation that is satisfied over time, we recognize revenue using a single measure of progress either based on hours incurred or based on stage of progress under the project. Our contracts frequently provide customers with rights to use or access our products or technology, along with other promises or performance obligations.
For each performance obligation that is satisfied over time, we recognize revenue using a single measure of progress either based on hours incurred or output of services provided. 57 Our contracts frequently provide customers with rights to use or access our products or technology, along with other promises or performance obligations.
The following summarizes our cash and cash equivalents balance and working capital as of December 31, 2022, 2021 and 2020 (in thousands): December 31, 2022 2021 2020 Cash and cash equivalents $ 113,984 $ 116,797 $ 149,117 Working capital $ 113,828 $ 128,517 $ 159,442 Sources of Capital In addition to our existing cash and cash equivalents and revenue generated through our existing operations, we are eligible to earn milestone and other contingent payments for the achievement of defined collaboration objectives and certain royalty payments under our collaboration agreements with Merck, Novartis and Nestlé Health Science of up to $439.0 million in aggregate.
The following summarizes our cash and cash equivalents balance and working capital as of December 31, 2023, 2022 and 2021 (in thousands): December 31, 2023 2022 2021 Cash and cash equivalents $ 65,116 $ 113,984 $ 116,797 Working capital $ 57,636 $ 113,828 $ 128,517 Sources of Capital In addition to our existing cash and cash equivalents and revenue generated through our existing operations, we are eligible to earn milestone and other contingent payments for the achievement of defined collaboration objectives and certain royalty payments under our collaboration agreements with Merck, Nestlé, and Novartis of up to $59.0 million in aggregate.
If this happens, we may be forced to delay or terminate research or development programs or the commercialization of products resulting from our technologies, curtail or cease operations or obtain funds through collaborative and licensing arrangements that may require us to relinquish commercial rights, or grant licenses on terms that are not favorable to us.
If this happens, we may be forced to delay or terminate development of new products or services, such as our ECO Synthesis ™ manufacturing platform, or the commercialization of products resulting from our technologies, curtail or cease operations or obtain funds through collaborative and licensing arrangements that may require us to relinquish commercial rights, or grant licenses on terms that are not favorable to us.
Our ability to earn these milestone and contingent payments and the timing of achieving these milestones is primarily dependent upon the outcome of our collaborators’ research and development activities and is uncertain at this time . In addition, pursuant to the terms of the Pfizer Supply Agreement, we received a fee of $25.9 million in August 2022.
Our ability to earn these milestone and contingent payments and the timing of achieving these milestones is primarily dependent upon the outcome of our collaborators’ research and development activities and is uncertain at this time . 54 In addition, pursuant to the terms of the Pfizer Supply Agreement, Pfizer paid us a fee of $25.9 million in August 2022 which was recorded as deferred revenue.
Concurrently with our initial equity investment, we entered into the MAI Agreement pursuant to which performed services utilizing our CodeEvolver ® protein engineering platform technology to improve DNA polymerase enzymes in exchange for compensation in the form of additional shares of MAI's Series A preferred stock.
Concurrently with our initial equity investment, we entered into a Master Collaboration and Research Agreement with MAI (the “MAI Agreement”), pursuant to which we performed services utilizing our CodeEvolver ® directed evolution technology platform to improve DNA polymerase enzymes in exchange for compensation in the form of additional shares of MAI's Series A and B preferred stock.
(2) Product gross margin is used as a performance measure to provide additional information regarding our results of operations on a consolidated basis. 2022 compared to 2021 Cost of product revenue increased by $15.8 million in 2022 to $38.0 million, as compared to 2021.
(2) Product gross margin is used as a performance measure to provide additional information regarding our results of operations on a consolidated basis. 51 2023 compared to 2022 Cost of product revenue decreased by $25.2 million in 2023 to $12.8 million, as compared to 2022.
We have historically experienced negative cash flows from operations as we continue to invest in key technology development projects and improvements to our CodeEvolver ® protein engineering technology platform, and expand our business development and collaboration with new customers.
We have historically experienced negative cash flows from operations as we continue to invest in key technology development projects and improvements to our CodeEvolver ® technology platform, develop and commercialize new and existing products including our ECO Synthesis™ manufacturing platform and expand our business development and collaboration with new customers.
On the date of this filing, we also filed a post-effective amendment to that Registration Statement on Form S-3. Pursuant to that post-effective amendment, we registered an aggregate $200.0 million of securities.
On February 27, 2023, we filed a post-effective amendment to that Registration Statement on Form S-3. Pursuant to that post-effective amendment, we registered an aggregate $200.0 million of securities.
As of December 31, 2022, we have 18,292,369 shares of MAI's Series A and B preferred stock that we have earned or purchased since executing the Stock Purchase Agreement with MAI.
As of December 31, 2023, we held 19,277,914 shares of MAI's Series A and B preferred stock that we have earned or purchased since executing the Stock Purchase Agreement with MAI.
The increase was driven by growth in product revenue of $46.0 million, or 65%, but partially offset by a decrease in research and development revenue of $12.2 million, or 36%.
The increase was driven by growth in product revenue of $46.0 million, or 65%, partially offset by a decrease in research and development revenue of $12.2 million, or 36%. Product revenue was $116.7 million in 2022, an increase of 65% compared with $70.7 million in 2021.
Considering these industry practices and our experience, we do not believe the total of customer purchase orders outstanding (backlog) provides meaningful information that can be relied on to predict actual sales for future periods. 2022 compared to 2021 Total revenues increased b y $33.8 million in 2022 to $138.6 million, as compared to 2021.
Considering these industry practices and our experience, we do not believe the total of customer purchase orders outstanding (backlog) provides meaningful information that can be relied on to predict actual sales for future periods. 2023 compared to 2022 Total revenues decreased by $68.4 million in 2023 to $70.1 million, as compared to 2022.
In May 2021, we filed a Registration Statement on Form S-3 with the SEC, that automatically became effective upon its filing, under which we may sell common stock, preferred stock, debt securities, warrants, purchase contracts, and units from time to time in one or more offerings.
As of December 31, 2023, we have 1,293,535 shares of seqWell's Series C and C-1 preferred stock that we have earned or purchased since executing the Stock Purchase Agreement with seqWell. 48 In May 2021, we filed a Registration Statement on Form S-3 with the SEC, that automatically became effective upon its filing, under which we may sell common stock, preferred stock, debt securities, warrants, purchase contracts, and units from time to time in one or more offerings.
The increase in product revenue of $46.0 million, or 65%, to $116.7 million in 2022, compared to $70.7 million in 2021 was primarily due to $40.9 million higher revenue from Pfizer sales related to the purchase of CDX-616.
The increase in product revenue was primarily due to $40.9 million higher revenue from Pfizer sales related to the purchase of CDX-616.
Cash Flows from Financing Activities The $4.3 million decrease in net cash provided by financing activities in 2022 as compared to 2021 was primarily due to higher cash paid on taxes related to net share settlement of equity awards and lower proceeds from exercises of stock options.
Cash Flows from Financing Activities The $8.7 million increase in net cash provided by financing activities in 2023 as compared to 2022 was primarily due to proceeds from issuance of common stock under the EDA and lower cash paid on taxes related to net share settlement of equity awards.
The fee is creditable against future orders of CDX-616 used to manufacture PAXLOVID™ with shipment dates prior to December 31, 2023 and for fees associated with any new development and licensing agreements with Pfizer entered into prior to March 31, 2023 that are invoiced prior to December 31, 2023.
Pursuant to the agreement, 90% of the fee ($23.3 million) is creditable against (i) future orders of CDX-616 used to manufacture its PAXLOVID™ with shipment dates prior to December 31, 2023 , and (ii) fees associated with any new development and licensing agreements with Pfizer entered into prior to April 4, 2023.
The consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the United States and include our accounts and the accounts of our wholly owned subsidiaries.
CRITICAL ACCOUNTING POLICIES AND ESTIMATES Management’s discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements. The consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the United States and include our accounts and the accounts of our wholly owned subsidiaries.
Our largest uses of cash from operating activities are for employee-related expenditures, rent payments, inventory purchases to support our product sales and non-payroll research and development costs. 73 Equity Distribution Agreement In May 2021, we entered into an Equity Distribution Agreement ("EDA") with Piper Sandler & Co ("PSC"), under which PSC, as our exclusive agent, at our discretion and at such times that we may determine from time to time, may sell over a three-year period from the execution of the EDA up to a maximum of $50.0 million of shares of our common stock.
Equity Distribution Agreement In May 2021, we entered into an Equity Distribution Agreement (“EDA ” ) with Piper Sandler & Co (“PSC ” ), under which PSC, as our exclusive agent, at our discretion and at such times that we may determine from time to time, may sell over a three-year period from the execution of the EDA up to a maximum of $50.0 million of shares of our common stock.
Under the terms of the EDA, PSC may sell the shares at market prices by any method that is deemed to be an "at the market offering" as defined in Rule 415 under the Securities Act of 1933, as amended. During the year ended December 31, 2022, no shares of our common stock were issued pursuant to the EDA.
Under the terms of the EDA, PSC may sell the shares at market prices by any method that is deemed to be an “at the market offering” as defined in Rule 415 under the Securities Act of 1933, as amended.
Research and development expenses are expensed when incurred. 2022 compared to 2021 Research and development expenses were $80.1 million in 2022 compared to $55.9 million in 2021, an increase of $24.2 million, or 43%.
These were partially offset by $1.7 million in higher allocable costs. 2022 compared to 2021 Research and development expenses were $80.1 million in 2022 compared to $55.9 million in 2021, an increase of $24.2 million, or 43%.
Our primary source of cash flows from operating activities is cash receipts from our customers for purchases of products, collaborative research and development services, and licensing our technology to major pharmaceutical companies.
Our primary source of cash flows from operating activities is cash receipts from our customers for purchases of products, collaborative research and development services, and licensing our technology to major pharmaceutical companies. Our largest uses of cash from operating activities are for employee-related expenditures, rent payments, inventory purchases to support our product sales and non-payroll research and development costs.
Our unique enzymes drive improvements such as higher yields, reduced energy usage and waste generation, improved efficiency in manufacturing, greater sensitivity in genomic and diagnostic applications, and potentially more efficacious therapeutics.
Our unique enzymes drive improvements such as higher yields, increased purity, reduced energy usage and waste generation, and improved efficiency in manufacturing.
Interest income increased by $0.1 million in 2021 compared to 2020, primarily due to earned interest income on a non-marketable debt security, which was partially offset by a reduction in interest income from lower average interest rates on lower average cash balances Other Income (Expense), net Other income (expense), net, decreased by $1.0 million in 2022 compared to 2021, primarily due to a higher gain from remeasurement on the carrying value of our investment in MAI in the prior year compared to this year .
Interest income increased by $1.0 million in 2022 compared to 2021, primarily due to higher average interest rates on cash balances, and was partially offset by earned interest income on a non-marketable debt security in the prior year.
Our primary uses of capital are, and we expect will continue to be for the near future, compensation and related expenses, research and development expenses including costs related to the potential clinical development of our product candidates, manufacturing costs, laboratory and related supplies, legal and other regulatory expenses, and general overhead costs.
Our primary uses of capital for the foreseeable future, including the next 12 months, are for compensation and related expenses, research and development expenses including manufacturing costs, laboratory and related supplies, legal and other regulatory expenses, and general overhead costs.
We recognize revenue at the later of (i) when the related sale of the product occurs, or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied, or partially satisfied. 76 Investment in Non-Marketable Securities Investment in Non-Marketable Equity Securities We measure investments in non-marketable equity securities without a readily determinable fair value using a measurement alternative that measures these securities at the cost method minus impairment, if any, plus or minus changes resulting from observable price changes on a non-recurring basis.
Investment in Non-Marketable Securities Investment in Non-Marketable Equity Securities We measure investments in non-marketable equity securities without a readily determinable fair value using a measurement alternative that measures these securities at the cost method minus impairment, if any, plus or minus changes resulting from observable price changes on a non-recurring basis.
Cash Flows The following is a summary of cash flows for the years ended December 31, 2022, 2021 and 2020 (in thousands): Year Ended December 31, 2022 2021 2020 Net cash provided by (used in) operating activities $ 11,284 $ (14,267) $ (16,464) Net cash used in investing activities (13,578) (21,422) (5,748) Net cash provided by (used in) financing activities (575) 3,767 80,808 Net increase (decrease) in cash, cash equivalents and restricted cash $ (2,869) $ (31,922) $ 58,596 74 Cash Flows from Operating Activities The $25.6 million increase in net cash provided by operating activities in 2022 as compared to 2021 was primarily due to the receipt of a $25.9 million fee from Pfizer in August 2022 creditable against future orders and increases in cash received from revenue, which was partially offset by increased payments associated with higher operating costs.
Cash Flows The following is a summary of cash flows for the years ended December 31, 2023, 2022 and 2021 (in thousands): Year Ended December 31, 2023 2022 2021 Net cash provided by (used in) operating activities $ (52,638) $ 11,284 $ (14,267) Net cash used in investing activities (4,858) (13,578) (21,422) Net cash provided by (used in) financing activities 8,167 (575) 3,767 Net decrease in cash, cash equivalents and restricted cash $ (49,329) $ (2,869) $ (31,922) Cash Flows from Operating Activities The $63.9 million decrease in net cash provided by operating activities in 2023 as compared to 2022 was primarily due to the net effect of decreases in cash received from our customers due to lower revenue in 2023 and with 2022 benefiting from the receipt of a $25.9 million fee from Pfizer that is creditable against future orders, partially offset by decreases in cash paid for cost of revenues and operating expenses.
A portion of our research and development revenue in 2022 and 2021 was paid to us by MAI in the form of additional shares of MAI Series A and Series B preferred stock.
A portion of our research and development revenue in 2022 and 2021 was paid to us by MAI in the form of additional shares of MAI Series A and Series B preferred stock. We received an aggregate of 1,587,049 and 3,491,505 shares of MAI's Series A and B preferred stock for the years ended December 31, 2022 and 2021, respectively.
The $2.2 million decrease in net cash used by operating activities in 2021 as compared to 2020 was primarily due to increases in cash received from revenue, which was partially offset by increased payments associated with higher operating costs.
The $25.6 million increase in net cash provided by operating activities in 2022 as compared to 2021 was primarily due to the receipt of a $25.9 million fee from Pfizer in August 2022 creditable against future orders and increases in cash received from revenue, which was partially offset by increased payments associated with higher operating costs.
During the year ended December 31, 2022, no shares of our common stock were issued pursuant to the EDA, and as of December 31, 2022, $50.0 million worth of shares remained available for sale under the EDA.
During the year ended December 31, 2023, 3,079,421 shares of our common stock were issued and sold pursuant to the EDA, all during the first half of 2023, and we received net proceeds of $7.9 million. As of December 31, 2023, $41.3 million of shares remained available for sale under the EDA.
Interest Income and Other Income (Expense), net (in thousands, except percentages): Change Year Ended December 31, 2022 2021 2022 2021 2020 $ % $ % Interest income $ 1,441 $ 459 $ 405 $ 982 214 % $ 54 13 % Other income (expense), net 124 1,148 (156) (1,024) 89 % 1,304 836 % Total other income (expense), net $ 1,565 $ 1,607 $ 249 $ (42) (3) % $ 1,358 545 % Interest Income Interest income increased by $1.0 million in 2022 compared to 2021, primarily due to higher average interest rates on cash balances and was partially offset by earned interest income on a non-marketable debt security in the prior year.
Interest Income and Other Income (Expense), net (in thousands, except percentages): Change Year Ended December 31, 2023 2022 2023 2022 2021 $ % $ % Interest income $ 4,172 $ 1,441 $ 459 $ 2,731 190 % $ 982 214 % Other income (expense), net (12,274) 124 1,148 (12,398) (9,998) % (1,024) (89) % Total other income (expense), net $ (8,102) $ 1,565 $ 1,607 $ (9,667) (618) % $ (42) (3) % Interest Income Interest income increased by $2.7 million in 2023 compared to 2022, primarily due to higher average interest rates on cash balances.
The $15.7 million increase in net cash used in investing activities in 2021 as compared to 2020, was primarily due to higher cash utilized for the additional investments in MAI's Series A and B preferred stock for $7.6 million and higher purchases of property and equipment during 2021.
Cash Flows from Investing Activities The $8.7 million decrease in net cash used in investing activities in 2023 as compared to 2022 was primarily due to higher cash utilized for additional investments in equity securities and purchases of property and equipment in the prior year.
Starting in 2022, changes to Internal Revenue Code Section 174 made by the Tax Cuts and Jobs Act of 2017 no longer permit an immediate deduction for research and development expenditures in the tax year that such costs are incurred.
The provision for income taxes in 2022 was primarily due to the income tax withholding imposed by foreign taxing authorities on income earned in certain countries outside of the Unites Stated and remitted to the United States and the accrual of interest and penalties on historic uncertain tax positions, as well as current year state income taxes. 53 Starting in 2022, changes to Internal Revenue Code Section 174 made by the Tax Cuts and Jobs Act of 2017 no longer permit an immediate deduction for research and development expenditures in the tax year that such costs are incurred.
If future financings involve the issuance of equity securities, our existing stockholders would suffer dilution. If we raise debt financing or enter into credit facilities, we may be subject to restrictive covenants that limit our ability to conduct our business. We may not be able to raise sufficient additional funds on terms that are favorable to us, if at all.
If future financings involve the issuance of equity securities, our existing stockholders would suffer dilution. In addition, under our Loan Agreement, we are subject to restrictive covenants that limit our ability to conduct our business and could be subject to additional covenants to the extent we seek other debt financing in the future.
Restructuring Charges Restructuring charges in 2022 consist of one-time employee severance and other termination benefits due to a workforce reduction plan that occurred in the fourth quarter of 2022.
Some of these cost increases are a result of the impact of inflation seen in 2022. Restructuring Charges Restructuring charges consist of employee severance and other termination benefits due to workforce reduction plans that were initiated during the third quarter of 2023 and in the fourth quarter of 2022.
The valuation may be reduced if the company's potential has deteriorated significantly. If the factors that led to a reduction in valuation are overcome, the valuation may be readjusted.
The valuation may be reduced if the company's potential has deteriorated significantly.
We have historically funded our operations primarily through cash generated from operations, stock option exercises and public and private offerings of our common stock. We also have the ability to borrow up to $5.0 million under our Credit Facility (defined below).
LIQUIDITY AND CAPITAL RESOURCES Liquidity is the measurement of our ability to meet working capital needs and to fund capital expenditures. We have historically funded our operations primarily through cash generated from operations, stock option exercises and public and private offerings of our common stock.
Up to 50% of any portion of the fee which has not been credited pursuant to credits granted under the preceding sentence is creditable against future orders of CDX-616 used to manufacture PAXLOVID™ with shipment dates prior to December 31, 2024.
Up to 50% of any portion of the $25.9 million which has not been credited under items (i) and (ii) is creditable against future orders of CDX-616 used to manufacture PAXLOVID™ with shipment dates in 2024, and any portion of the fee that is not utilized within the specific period will be forfeited and recognized as revenue.
In June 2020, we entered into a Stock Purchase Agreement with MAI pursuant to which we purchased 1,587,050 shares of MAI's Series A preferred stock for $1.0 million. In connection with the transaction, John Nicols, our former President and Chief Executive Officer, also joined MAI’s board of directors.
During the year ended December 31, 2022, no shares of our common stock were sold pursuant to the EDA. In June 2020, we entered into a Stock Purchase Agreement with MAI, a privately held life sciences company, pursuant to which we purchased 1,587,050 shares of MAI's Series A preferred stock for $1.0 million. Mr.
The following table shows the amounts of our product revenue, cost of product revenue, product gross profit and product gross margin from our consolidated statements of operations (in thousands, except percentages): Year Ended December 31, Change Year Ended December 31, Change 2022 2021 $ % 2021 2020 $ % Product revenue $ 116,676 $ 70,657 $ 46,019 65 % $ 70,657 $ 30,220 $ 40,437 134 % Cost of product revenue (1) 38,033 22,209 15,824 71 % 22,209 13,742 8,467 62 % Product gross profit $ 78,643 $ 48,448 $ 30,195 62 % $ 48,448 $ 16,478 $ 31,970 194 % Product gross margin (%) (2) 67 % 69 % 69 % 55 % (1) Cost of product revenue comprises both internal and third-party fixed and variable costs, including materials and supplies, labor, facilities and other overhead costs associated with our product revenue.
Costs and Operating Expenses (in thousands, except percentages): Change Year Ended December 31, 2023 2022 2023 2022 2021 $ % $ % Cost of product revenue $ 12,809 $ 38,033 $ 22,209 $ (25,224) (66) % $ 15,824 71 % Research and development 58,885 80,099 55,919 (21,214) (26) % 24,180 43 % Selling, general and administrative 53,250 52,172 49,323 1,078 2 % 2,849 6 % Restructuring charges 3,284 3,167 — 117 4 % 3,167 100 % Asset impairment and other charges 9,984 — — 9,984 100 % — — % Total costs and operating expenses $ 138,212 $ 173,471 $ 127,451 $ (35,259) (20) % $ 46,020 36 % Costs of Product Revenue and Product Gross Margin The following table shows the amounts of our product revenue, cost of product revenue, product gross profit and product gross margin from our consolidated statements of operations (in thousands, except percentages): Year Ended December 31, Change Year Ended December 31, Change 2023 2022 $ % 2022 2021 $ % Product revenue $ 42,906 $ 116,676 $ (73,770) (63) % $ 116,676 $ 70,657 $ 46,019 65 % Cost of product revenue (1) 12,809 38,033 (25,224) (66) % 38,033 22,209 15,824 71 % Product gross profit $ 30,097 $ 78,643 $ (48,546) (62) % $ 78,643 $ 48,448 $ 30,195 62 % Product gross margin (%) (2) 70 % 67 % 67 % 69 % (1) Cost of product revenue comprises both internal and third-party fixed and variable costs, including materials and supplies, labor, facilities and other overhead costs associated with our product revenue.
Research and development revenue decrea sed by $4.7 million in 2021 to $34.1 million, or 12% compared with $38.8 million in 2020, primarily due to lower license and research and development fees from Takeda and lower revenues from Novartis recognized in 2021 compared to the prior year, which was partially offset by higher license fees from other existing collaboration agreements.
Research and development revenue increased by $5.3 million in 2023 to $27.2 million, or 24% compared with $21.9 million in 2022, primarily due to higher revenue from the Pfizer license agreement and from Nestlé Health Science under the Nestlé SCA and development agreement and the Acquisition Agreement, which was partially offset by lower research and development fees from existing collaboration agreements being recognized in 2023 as compared to the prior year. 2022 compared to 2021 Total revenues increased b y $33.8 million in 2022 to $138.6 million, as compared to 2021.
The provision for income taxes in 2020 was primarily due to foreign withholding taxes on certain sales to non-U.S. customers. Net Loss Net loss for 2022 was $33.6 million, or a net loss per basic and diluted share of $0.51. This compared to a net loss of $21.3 million, or $0.33 per basic and diluted share for 2021.
Net Loss Net loss for 2023 was $76.2 million, or a net loss per basic and diluted share of $1.12. This compared to a net loss of $33.6 million, or $0.51 per basic and diluted share for 2022.
Under the terms of the Pfizer Supply Agreement, Pfizer paid us a fee of $25.9 million in August 2022 which is creditable against future orders of CDX-616 used to manufacture its PAXLOVID™ . The sale of CDX-616 to Pfizer had a substantial impact on our revenue for the year ended December 31, 2022.
Up to 50% of any portion of the $25.9 million which has not been credited under items (i) and (ii) is creditable against future orders of CDX-616 used to manufacture PAXLOVID™ with shipment dates in 2024. The sale of CDX-616 to Pfizer had a substantial impact on our revenues in 2021 and 2022, and to a lesser extent in 2023.
Stewart Parker to our Board of Directors. 63 Recent Investing and Financing Activities In March 2022, we entered into a Stock Purchase Agreement with seqWell Inc. ("seqWell"), a privately held biotechnology company, pursuant to which we purchased 1,000,000 shares of seqWell's Series C preferred stock for $5.0 million.
(“seqWell ” ), a privately held biotechnology company, pursuant to which we purchased 1,000,000 shares of seqWell's Series C preferred stock for $5.0 million. In September 2023, we purchased an additional 88,256 shares of seqWell's Series C-1 preferred stock and 44,128 common stock warrants for $0.4 million.
Other income (expense), net increased by $1.3 million in 2021 compared to 2020, primarily due to a $1.0 million gain from remeasurement on the carrying value of our investment in MAI. 68 Provision for Income Taxes (in thousands, except percentages): Change Year Ended December 31, 2022 2021 2022 2021 2020 $ % $ % Provision for income taxes $ 276 $ 189 $ 339 $ 87 46 % (150) (44) % The provision for income taxes for 2022 was primarily due to the income tax withholding imposed by foreign taxing authorities on income earned in certain countries outside of the Unites Stated and remitted to the United States and the accrual of interest and penalties on historic uncertain tax positions, as well as current year state income taxes.
Provision for Income Taxes (in thousands, except percentages): Change Year Ended December 31, 2023 2022 2023 2022 2021 $ % $ % Provision for income taxes $ 69 $ 276 $ 189 $ (207) (75) % $ 87 46 % The provision for income taxes in 2023 was primarily for current year state income taxes and the accrual of interest and penalties on historic uncertain tax positions.
The increase was primarily due to an increase in costs associated with outside services and higher headcount but partially offset by lower allocable expenses. Selling, general and administrative expense in the Performance Enzymes segment increased by $2.6 million, or 22%, to $14.7 million in 2022, compared to $12.1 million in 2021.
This was partially offset by $3.2 million lower stock based compensation expense and $0.4 million in lower allocable expenses. 52 2022 compared to 2021 Selling, general and administrative expenses were $52.2 million in 2022 compared to $49.3 million in 2021, an increase of $2.8 million, or 6%.
The decrease in net loss was primarily related to an increase in product revenue with higher margins, which was partially offset by higher operating expenses and lower research and development revenues.
The increase in net loss was primarily related to lower product revenues from CDX-616 and one-time charges recognized during 2023 related to asset impairment, including impairment in our investments in non-marketable equity securities, and restructuring charges, which was partially offset by lower operating expenses in 2023.
Some of these cost increases are a result of the impact of inflation seen in 2022. 2021 compared to 2020 Selling, general and administrative expenses were $49.3 million in 2021 compared to $35.0 million in 2020, an increase of $14.3 million, or 41%.
Some of these cost increases are a result of the impact of inflation seen in 2022.
The increase was primarily due to $7.6 million in costs associated with higher headcount, $0.8 million in higher stock-based compensation expenses, $2.6 million in higher lab supplies, $2.2 million in higher allocable expenses, $1.1 million increase in outside services, and $1.0 million in higher depreciation expenses, which was partially offset by a $3.7 million decrease in costs associated with outside services related to CMC and regulatory expenses.
This decrease was primarily due $10.0 million decrease in costs associated with lower headcount, $6.4 million decrease in outside services and Chemistry, Manufacturing and Controls (“CMC”) and regulatory expense, $4.1 million in lower lab supplies expense, $1.3 million in lower stock comp expense, and $1.0 million decrease in lease costs due to the assignment of our San Carlos facility lease.
The spread of COVID-19 has affected segments of the global economy and may affect our operations, including the potential interruption of our supply chain.
Business Impact of COVID-19 and Sales of CDX-616 to Pfizer for PAXLOVID™ In March 2020, the World Health Organization declared COVID-19 a global pandemic and recommended containment and mitigation measures worldwide. The impact of COVID-19 affected segments of the global economy and its continuing impacts may affect our operations, including the potential interruption of our supply chain.
Some of these cost increases are a result of the impact of inflation seen in 2022. 67 2021 compared to 2020 Research and development expenses were $55.9 million in 2021 compared to $44.2 million in 2020, an increase of $11.7 million, or 26%.
Research and development expenses are expensed when incurred. 2023 compared to 2022 Research and development expenses were $58.9 million in 2023 compared to $80.1 million in 2022, a decrease of $21.2 million, or 26%.
Product revenue, which consist primarily of sales of biocatalysts, pharmaceutical intermediates, and Codex ® biocatalyst panels and kits, was $116.7 million in 2022, an increase of 65% compared with $70.7 million in 2021. The increase in product revenue was primarily due to $40.9 million higher revenue from Pfizer sales related to the purchase of CDX-616.
The decrease was driven by lower product revenue as compared to the prior year. 50 Product revenue was $42.9 million in 2023, a decrease of 63% compared with $116.7 million in 2022. The decrease in product revenue was primarily due to decreased sales of CDX-616 to Pfizer.
The product gross margin increased to 69% in 2021 as compared to 55% in 2020, primarily due to the sale of higher margin branded products. Research and Development Expenses Research and development expenses consist of costs incurred for internal projects as well as collaborative research and development activities.
Some of these cost increases are a result of the impact of inflation and supply chain pressures seen in 2022. Research and Development Expenses Research and development expenses consist of costs incurred for internal projects as well as collaborative research and development activities.