Biggest changeThere were no asset impairment charges for the years ended December 31, 2022 and 2021. Results of Operations Comparison of the years ended December 31, 2022, 2021, and 2020 Year Ended December 31, Changes (in thousands) 2022 2021 2020 2022 - 2021 2021 - 2020 Amount Percent Amount Percent Revenues: Product revenues $ 797,307 $ 580,080 $ 377,877 $ 217,227 37.4 % $ 202,203 53.5 % Licensing and other revenues 22,915 45,406 13,128 (22,491) (49.5) 32,278 245.9 Total revenues 820,222 625,486 391,005 194,736 31.1 234,481 60.0 Cost and expenses: Cost of product revenues 453,632 315,195 200,097 138,437 43.9 115,098 57.5 Cost of licensing and other revenues 2,624 3,223 3,523 (599) (18.6) (300) (8.5) Research and development 316,415 264,208 100,035 52,207 19.8 164,173 164.1 Selling, general and administrative 588,591 511,034 303,627 77,557 15.2 207,407 68.3 Total cost and expenses 1,361,262 1,093,660 607,282 267,602 24.5 486,378 80.1 Loss from operations (541,040) (468,174) (216,277) (72,866) 15.6 (251,897) 116.5 Interest expense (9,319) (8,305) (15,082) (1,014) 12.2 6,777 (44.9) Interest and other income, net 3,538 5,381 7,562 (1,843) (34.3) (2,181) (28.8) Loss on debt extinguishment — — (5,848) — — 5,848 100.0 Loss before income taxes (546,821) (471,098) (229,645) (75,723) 16.1 (241,453) 105.1 Income tax expense (978) (618) (98) (360) 58.3 (520) 530.6 Net loss $ (547,799) $ (471,716) $ (229,743) $ (76,083) 16.1 % $ (241,973) 105.3 % _______________________ Revenues Total revenues are comprised of product revenues, which are primarily driven by sales of our Panorama and HCS tests, and licensing and other revenues, which primarily includes development licensing revenue, licensing of our Constellation software to our licensees.
Biggest changeThe measurement of stock-based compensation is subject to periodic adjustments as the underlying equity instruments vest, and the resulting change in value, if any, is recognized in our statements of operations and comprehensive loss during the period that the related services are rendered. Results of Operations Comparison of the years ended December 31, 2023, 2022, and 2021 Year Ended December 31, Changes (in thousands) 2023 2022 2021 2023 - 2022 2022 - 2021 Amount Percent Amount Percent Revenues: Product revenues $ 1,068,522 $ 797,307 $ 580,080 $ 271,215 34.0 % $ 217,227 37.4 % Licensing and other revenues 14,049 22,915 45,406 (8,866) (38.7) (22,491) (49.5) Total revenues 1,082,571 820,222 625,486 262,349 32.0 194,736 31.1 Cost and expenses: Cost of product revenues 588,564 453,632 315,195 134,932 29.7 138,437 43.9 Cost of licensing and other revenues 1,267 2,624 3,223 (1,357) (51.7) (599) (18.6) Research and development 320,678 316,415 264,208 4,263 1.3 52,207 19.8 Selling, general and administrative 618,307 588,591 511,034 29,716 5.0 77,557 15.2 Total cost and expenses 1,528,816 1,361,262 1,093,660 167,554 12.3 267,602 24.5 Loss from operations (446,245) (541,040) (468,174) 94,795 17.5 (72,866) (15.6) Interest expense (12,638) (9,319) (8,305) (3,319) (35.6) (1,014) (12.2) Interest and other income, net 24,353 3,538 5,381 20,815 588.3 (1,843) (34.3) Loss before income taxes (434,530) (546,821) (471,098) 112,291 20.5 (75,723) (16.1) Income tax expense (271) (978) (618) 707 72.3 (360) (58.3) Net loss $ (434,801) $ (547,799) $ (471,716) $ 112,998 20.6 % $ (76,083) (16.1) % _______________________ Revenues Total revenues are comprised of product revenues, which are primarily driven by sales of our Panorama and HCS tests, and licensing and other revenues, which primarily includes development licensing revenue, licensing of our Constellation software to our licensees.
Research and Development Research and development expenses include costs incurred to develop our technology, collect clinical samples and conduct clinical studies to develop and support our products.
Expenses Research and Development Research and development expenses include costs incurred to develop our technology, collect clinical samples and conduct clinical studies to develop and support our products.
Revenues recognized from tests processed through our Constellation model, and from our strategic partnership agreements, are reported in licensing and other revenues. 72 Table of Contents In cases where we sell our tests through our laboratory partners, the majority of our laboratory partners bill the patient, clinic or insurance carrier for the performance of our tests, and we are entitled to either a fixed price per test or a percentage of their collections. Our ability to increase our revenues will depend on our ability to further penetrate the domestic and international markets and, in particular, generate sales through our direct sales force, develop and commercialize additional tests, obtain reimbursement from additional third-party payers and increase our reimbursement rates for tests performed.
Revenues recognized from tests processed through our Constellation model, and from our strategic partnership agreements, are reported in licensing and other revenues. 73 Table of Contents In cases where we sell our tests through our laboratory partners, the majority of our laboratory partners bill the patient, clinic or insurance carrier for the performance of our tests, and we are entitled to either a fixed price per test or a percentage of their collections. Our ability to increase our revenues will depend on our ability to further penetrate the domestic and international markets and, in particular, generate sales through our direct sales force, develop and commercialize additional tests, obtain reimbursement from additional third-party payers and increase our reimbursement rates for tests performed.
However, cost of licensing and other revenues for the Constellation software platform are relatively low, and therefore, its associated gross margin is higher. 73 Table of Contents Cost of Product Revenues The components of our cost of product revenues are material and service costs, impairment charges associated with testing equipment, personnel costs, including stock-based compensation expense, equipment and infrastructure expenses associated with testing samples, electronic medical records, order and delivery systems, shipping charges to transport samples, costs incurred from third party test processing fees, and allocated overhead such as rent, information technology costs, equipment depreciation and utilities.
However, cost of licensing and other revenues for the Constellation software platform are relatively low, and therefore, its associated gross margin is higher. 74 Table of Contents Cost of Product Revenues The components of our cost of product revenues are material and service costs, impairment charges associated with testing equipment, personnel costs, including stock-based compensation expense, equipment and infrastructure expenses associated with testing samples, electronic medical records, order and delivery systems, shipping charges to transport samples, costs incurred from third party test processing fees, and allocated overhead such as rent, information technology costs, equipment depreciation and utilities.
We also offer our Signatera molecular residual disease test for oncology applications, which we commercialize as a test run in our CLIA (as defined below) laboratory and offer on a research use only basis to research laboratories and pharmaceutical companies; and our Prospera organ transplant assessment tests. We process tests in our laboratories certified under the Clinical Laboratory Improvement Amendments of 1988 (“CLIA”) in Austin, Texas and San Carlos, California.
We also offer our Signatera molecular residual disease test for oncology applications, which we commercialize as a test run in our CLIA (as defined below) laboratory and offer on a research use only basis to research laboratories and pharmaceutical companies; and our Prospera organ transplant assessment tests. We process tests in our laboratories certified under the Clinical Laboratory Improvement Amendments of 1988, or CLIA, in Austin, Texas and San Carlos, California.
We currently have 11 revenue generating licensing and service agreements with laboratories under our Constellation distribution model. We consider our cost of licensing and other revenues for the Constellation software platform to be relatively low, and therefore we expect its associated gross margin is higher. We expect our cost of licensing will increase in relation to volume growth.
We currently have 15 revenue generating licensing and service agreements with laboratories under our Constellation distribution model. We consider our cost of licensing and other revenues for the Constellation software platform to be relatively low, and therefore we expect its associated gross margin is higher. We expect our cost of licensing will increase in relation to volume growth.
In November 2022, we completed an additional underwritten equity offering and sold 13,144,500 shares of our common stock at a price of $35 per share to the public. Before offering expenses of $0.5 million, we received proceeds of $433.2 million net of the underwriting discount.
In November 2022, we completed an underwritten equity offering and sold 13,144,500 shares of our common stock at a price of $35 per share to the public. Before offering expenses of approximately $0.5 million, we received proceeds of approximately $433.2 million net of the underwriting discount.
As of December 31, 2022, we are recognizing revenues on 11 licensing and service arrangements with laboratories under our Constellation model. Our strategy to offer access to our algorithm to laboratory licensees via our Constellation cloud-based software platform may also cause our revenues to decrease because we do not process the tests and perform the molecular biology analysis in our own laboratory under this model, and therefore are not able to charge as high an amount, and as a result realize lower revenues per test than when we perform the entire test ourselves.
As of December 31, 2023, we are recognizing revenues on 15 licensing and service arrangements with laboratories under our Constellation model. Our strategy to offer access to our algorithm to laboratory licensees via our Constellation cloud-based software platform may also cause our revenues to decrease because we do not process the tests and perform the molecular biology analysis in our own laboratory under this model, and therefore are not able to charge as high an amount, and as a result realize lower revenues per test than when we perform the entire test ourselves.
Costs associated with Whole Exome Sequencing (“WES”) are also included, as well as labor costs, relating to our Signatera CLIA and Signatera research use only offerings . Costs associated with performing tests are recorded when the test is accessioned. We expect cost of product revenues in absolute dollars to increase as the number of tests we perform increases.
Costs associated with Whole Exome Sequencing, or WES, are also included, as well as labor costs, relating to our Signatera CLIA and Signatera research use only offerings . Costs associated with performing tests are recorded when the test is accessioned. We expect cost of product revenues in absolute dollars to increase as the number of tests we perform increases.
The Convertible Notes are senior, unsecured obligations of the Company and bear interest at a rate of 2.25% per year, payable in cash semi-annually in arrears in May and November of 81 Table of Contents each year, beginning in November 2020. The Convertible Notes mature in May 2027, unless earlier converted, repurchased or redeemed in accordance with their terms.
The Convertible Notes are senior, unsecured obligations of the Company and bear interest at a rate of 2.25% per year, payable in cash semi-annually in arrears in May and November of each year, beginning in November 2020. The Convertible Notes mature in May 2027, unless earlier converted, repurchased or redeemed in accordance with their terms.
Such arrangements include those related to our lease commitments, Credit Line (as defined below), Convertible Notes, commercial supply agreements and other agreements. Credit Line The short-term debt obligations consist of the $80.4 million principal amount drawn from the UBS Credit Line (the “Credit Line’) and applicable interest.
Such arrangements include those related to our lease commitments, Credit Line (as defined below), Convertible Notes, commercial supply agreements and other agreements. Credit Line The short-term debt obligations consist of the $80.4 million principal amount drawn from the UBS Credit Line, or the Credit Line, and applicable interest.
The number of tests that we accession is a key indicator that we use to assess our business. A test is accessioned when we receive the test at our laboratory, the relevant information about the test is entered into our computer system, and the test sample is routed 71 Table of Contents into the appropriate workflow.
The number of tests that we accession is a key indicator that we use to assess our business. A test is accessioned when we receive the test at our laboratory, the relevant information about the test is entered into our computer system, and the test sample is routed into the appropriate workflow.
As of December 31, 2022, we have $70.0 million available on the Credit Line. While we have introduced multiple products that are generating revenues, these revenues have not been sufficient to fund all operations. Accordingly, we have funded the portion of operating costs that exceeds revenues through a combination of equity issuances and debt and other financings.
As of December 31, 2023, we have $20.0 million available on the Credit Line. While we have introduced multiple products that are generating revenues, these revenues have not been sufficient to fund all operations. Accordingly, we have funded the portion of operating costs that exceeds revenues through a combination of equity issuances and debt and other financings.
This increase in volume represents continuous commercial growth of Panorama and HCS, both as tests performed in our laboratories as well as through our Constellation software platform. The percent of our revenues attributable to our U.S. direct sales force were 89%, 89% and 87% for the years ended December 31, 2022, 2021, and 2020, respectively.
This increase in volume represents continuous commercial growth of Panorama and HCS, both as tests performed in our laboratories as well as through our Constellation software platform. The percent of our revenues attributable to our U.S. direct sales force were 91%, 89% and 89% for the years ended December 31, 2023, 2022, 2021, respectively.
We intend to mitigate any impact by driving more business from our most profitable accounts. Licensing and Other Revenues Revenues recognized from tests processed through our Constellation model, and from our strategic partnership agreements (which during the three years ended December 31, 2020, 2021 and 2022 comprised the Qiagen LC, or Qiagen, BGI Genomics Co.
We intend to mitigate any impact by driving more business from our most profitable accounts. Licensing and Other Revenues Revenues recognized from tests processed through our Constellation model, and from our strategic partnership agreements (which during the three years ended December 31, 2023, 2022 and 2021 comprised the Qiagen, BGI Genomics Co.
Discussions of year-to-year comparisons between 2021 and 2020 that are not included in this Annual Report on Form 10-K can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Item 7 of Part II of our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, filed with the SEC on February 24, 2022. Revenues Product Revenues We generate revenues from the sale of our tests, primarily from the sale of our Panorama and HCS tests.
Discussions of year-to-year comparisons between 2022 and 2021 that are not included in this Annual Report on Form 10-K can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Item 7 of Part II of our Annual Report on Form 10-K for the fiscal year ended December 31, 2022, filed with the SEC on March 1, 2023. Revenues Product Revenues We generate revenues from the sale of our tests, primarily from the sale of our Panorama and HCS tests.
For the year ended December 31, 2022, we had a net loss of $547.8 million, and we expect to continue to incur losses in future periods as we continue to devote a substantial portion of our resources to our research and development and commercialization efforts for our existing and new products.
For the year ended December 31, 2023, we had a net loss of $434.8 million, and we expect to continue to incur losses in future periods as we continue to devote a substantial portion of our resources to our research and development and commercialization efforts for our existing and new products.
The interest rate was subsequently changed to the 30-day Secured Overnight Financing Rate (“SOFR”) average, plus 1.21% in 2022. The SOFR rate is variable. UBS has the right to demand 79 Table of Contents full or partial payment of the Credit Line obligations and terminate it, in its discretion and without cause, at any time.
UBS has the right to demand full or partial payment of the Credit Line obligations and terminate it, in its discretion and without cause, at any time. The interest rate was subsequently changed to the 30-day Secured Overnight Financing Rate, or SOFR, average, plus 1.21%. The SOFR rate is variable.
For the years ended December 31, 2022, 2021, and 2020, there were no customers exceeding 10% of the total revenues on an individual basis. Revenues from customers outside the United States were $34.4 million, representing 4% of total revenues for the year ended December 31, 2022.
For the years ended December 31, 2023, 2022, and 2021, there were no customers exceeding 10% of the total revenues on an individual basis. Revenues from customers outside the United States were $34.9 million, representing 3% of total revenues for the year ended December 31, 2023.
We consider our critical accounting policies and estimates to be revenue recognition, leases, fair value measurements, and stock-based compensation. Recent Accounting Pronouncements We believe that the impact of accounting standards updates recently issued that are not yet effective will not have a material impact on our financial position or results of operations upon adoption.
We consider our critical accounting policies and estimates to be revenue recognition and stock-based compensation attributable to performance-based awards. Recent Accounting Pronouncements We believe that the impact of accounting standards updates recently issued that are not yet effective will not have a material impact on our financial position or results of operations upon adoption.
The Credit Line was amended in July 2017 and bears interest at 30-day LIBOR plus 1.10%, and it is secured by a first priority lien and security interest in our money market and marketable securities held in our managed investment account with UBS. The interest rate was subsequently changed to the 30-day SOFR average, plus 1.21% in 2022.
The Credit Line was amended in July 2017 and bears interest at 30-day LIBOR plus 1.10%, and it is secured by a first priority lien and security interest in our money market and marketable securities held in our managed investment account with UBS.
The number of tests that we process is a key metric as it tracks overall volume growth, particularly as our laboratory partners may transition from sending samples to our laboratory to our cloud-based distribution model, as a result of which our tests accessioned would decrease but our tests processed would remain unchanged. During the year ended December 31, 2022, we processed approximately 2,066,500 tests, comprised of approximately 2,004,000 tests accessioned in our laboratories.
The number of tests that we process is a key metric as it tracks overall 72 Table of Contents volume growth, particularly as our laboratory partners may transition from sending samples to our laboratory to our cloud-based distribution model, as a result of which our tests accessioned would decrease but our tests processed would remain unchanged. During the year ended December 31, 2023, we processed approximately 2,496,100 tests, comprised of approximately 2,426,500 tests accessioned in our laboratories.
This included non-cash stock compensation expense of $152.4 million, $115.2 million, and $50.2 million for the years ended December 31, 2022, 2021, and 2020, respectively.
This included non-cash stock compensation expense of $191.8 million, $152.4 million, and $115.2 million for the years ended December 31, 2023, 2022, and 2021, respectively.
As of December 31, 2022, we had an accumulated deficit of $1.9 billion. Components of the Results of Operations The section of this Management’s Discussion and Analysis generally discusses year-to-year comparisons between 2022 and 2021.
As of December 31, 2023, we had an accumulated deficit of $2.4 billion. Components of the Results of Operations The section of this Management’s Discussion and Analysis generally discusses year-to-year comparisons between 2023 and 2022.
As of December 31, 2022, we had an accumulated deficit of $1.9 billion. As of December 31, 2022, we had $466.1 million in cash and cash equivalents and restricted cash, $432.3 million in marketable securities, $80.4 million of outstanding balance of the Credit Line including accrued interest, and $287.5 million outstanding principal balance on the Convertible Notes.
As of December 31, 2023, we had an accumulated deficit of $2.4 billion. As of December 31, 2023, we had $642.1 million in cash and cash equivalents and restricted cash, $236.9 million in marketable securities, $80.4 million of outstanding balance of the Credit Line including accrued interest, and $287.5 million outstanding principal balance on the Convertible Notes.
The percent of our revenues attributable to U.S. laboratory partners for the year ended December 31, 2022, 2021, and 2020 were 7%, 5% and 7%, respectively.
The percent of our revenues attributable to U.S. laboratory partners for the year ended the year ended December 31, 2023, 2022, 2021, was 6%, 7% and 5%, respectively.
Total revenues for the year ended December 31, 2022 increased by $194.7 million, or 31.1%, when compared to the year ended December 31, 2021. We derive our revenues from tests based on units reported to customers—tests delivered with a result. All reported units are either accessioned in our laboratories or processed outside of our laboratories.
Total revenues for the year ended December 31, 2023 increased by $262.3 million, or 32.0%, when compared to the year ended December 31, 2022. We derive our revenues from tests based on units reported to customers—tests delivered with a result. All reported units are either accessioned in our laboratories or processed outside of our laboratories.
The Credit Line was amended in July 2017 and bears interest at 30-day LIBOR plus 1.10%, and it is secured by a first priority lien and security interest in our money market and marketable securities held in our managed investment account with UBS. The Credit Line was subsequently increased from $50.0 million to $150.0 million in 2020.
The Credit Line was amended in July 2017 and bears interest at 30-day LIBOR plus 1.10%, and it is secured by a first priority lien and security interest in our money market and marketable securities held in our managed investment account with UBS.
We generate a majority of our revenues from the sale of Panorama, our non-invasive prenatal test (“NIPT”), as well as Horizon, our Carrier Screening (“HCS”) test.
We generate a majority of our revenues from the sale of Panorama, our non-invasive prenatal test, or NIPT, as well as Horizon, our Carrier Screening, or HCS, test.
Product revenues generated from our testing accounted for $797.3 million or 97% of total revenues for the year ended December 31, 2022, compared to $580.1 million or 93% of total revenues for the year ended December 31, 2021 and $377.9 million or 97% of total revenues for the year ended December 31, 2020.
Product revenues generated from our testing accounted for $1,068.5 million or 99% of total revenues for the year ended December 31, 2023, compared to $797.3 million or 97% of total revenues for the year ended December 31, 2022 and $580.1 million or 93% of total revenues for the year ended December 31, 2021.
Operating liabilities resulted in cash inflows of $8.0 million resulting from a $19.2 million increase in accounts payable, a $10.5 million increase in accrued compensation, a $32.7 million increase in other accrued liabilities, offset by a $44.2 million decrease in deferred revenue and a $10.3 million decrease in operating lease liabilities. Cash Used in Investing Activities Cash provided by investing activities for the year ended December 31, 2022 totaled $330.3 million, which was comprised of $248.4 million in proceeds from sale of investments and $216.5 million proceeds of investments maturities, offset by $86.9 million purchases of new investments and $47.7 million in cash paid for the purchase of property and equipment. Cash used in investing activities for the year ended December 31, 2021 totaled $205.2 million, which was comprised of purchasing new investments of $876.1 million, $41.0 million in acquisitions of property and equipment, and $8.6 million in cash paid for the acquisition of an asset, offset by $187.6 million proceeds from sale of investments and $532.9 million from proceeds of investments maturities. Cash Provided by Financing Activities Cash provided by financing activities for the year ended December 31, 2022 totaled $482.6 million comprised of $433.2 million net proceeds from our equity offering completed in the fourth quarter of 2022, $30.0 million proceeds from Credit Line, $13.0 million in issuance of common stock under the employee stock purchase plan, and $6.4 million cash proceeds from the exercise of stock options. Cash provided by financing activities for the year ended December 31, 2021 totaled $576.2 million comprised of $11.8 million cash proceeds from the exercise of stock options, $13.6 million in issuance of common stock under the employee stock purchase plan, and $550.8 million net proceeds from our equity offering completed in the third quarter of 2021. Contractual Obligations and Other Commitments We have entered into arrangements that contractually obligate us to make payments that will affect our liquidity and cash flows in future periods.
Operating liabilities resulted in cash inflows of $48.4 million resulting from a $5.5 million increase in accounts payable, a $3.1 million increase in accrued compensation, a $47.7 million increase in other accrued liabilities, a $2.1 million increase in deferred revenue offset by a $10.0 million decrease in operating lease liabilities. Cash Provided by Investing Activities Cash provided by investing activities for the year ended December 31, 2023 totaled $168.5 million, which was comprised of $306.0 million proceeds of investments maturities, offset by $98.3 million purchases of new investments and $39.2 million in cash paid for the purchase of property and equipment. Cash provided by investing activities for the year ended December 31, 2022 totaled $330.3 million, which was comprised of $248.4 million in proceeds from sale of investments and $216.5 million proceeds of investments maturities, offset by $86.9 million purchases of new investments and $47.7 million in cash paid for the purchase of property and equipment. Cash Provided by Financing Activities Cash provided by financing activities for the year ended December 31, 2023 totaled $254.4 million comprised of $235.4 million net proceeds from our equity offering completed in the third quarter of 2023, $15.1 million in issuance of common stock under the employee stock purchase plan, and $3.9 million cash proceeds from the exercise of stock options. Cash provided by financing activities for the year ended December 31, 2022 totaled $482.6 million comprised of $433.2 million net proceeds from our equity offering completed in the fourth quarter of 2022, $30.0 million proceeds from Credit Line, $13.0 million in issuance of common stock under the employee stock purchase plan, and $6.4 million cash proceeds from the exercise of stock options. Contractual Obligations and Other Commitments We have entered into arrangements that contractually obligate us to make payments that will affect our liquidity and cash flows in future periods.
For the years ended December 31, 2021 and 2020, revenues from customers outside the United States were $34.6 million and $25.3 million, respectively, representing approximately 6% of total revenues in both years. Our net losses for the years ended December 31, 2022, 2021, and 2020, were $547.8 million, $471.7 million, and $229.7 million, respectively.
For the year ended December 31, 2021, revenues from customers outside the United States were $34.6 million, representing approximately 6% of total revenues. Our net losses for the years ended December 31, 2023, 2022, and 2021, were $434.8 million, $547.8 million, and $471.7 million, respectively.
The percent of our revenues attributable to international laboratory partners and other international sales for the year ended December 31, 2022 was 4%, down from 6% for both the years ended December 31, 2021 and December 31, 2020. For the year ended December 31, 2022, total revenues were $820.2 million, compared to $625.5 million and $391.0 million in the years ended December 31, 2021 and 2020, respectively.
The percent of our revenues attributable to international laboratory partners and other international sales was 3%, 4% and 6% for the years ended December 31, 2023, 2022 and 2021, respectively. For the year ended December 31, 2023, total revenues were $1,082.6 million, compared to $820.2 million and $625.5 million in the years ended December 31, 2022 and 2021, respectively.
During the year ended December 31, 2021, we processed approximately 1,570,000 tests, comprised of approximately 1,513,400 tests accessioned in our laboratories. During the year ended December 31, 2020, we processed approximately 1,026,500 tests, comprised of approximately 974,400 tests accessioned in our laboratories.
During the year ended December 31, 2022, we processed approximately 2,066,500 tests, comprised of approximately 2,004,000 tests accessioned in our laboratories. During the year ended December 31, 2021, we processed approximately 1,570,000 tests, comprised of approximately 1,513,400 tests accessioned in our laboratories.
The net loss of $547.8 million includes $200.9 million in non-cash charges resulting from $16.7 million of depreciation and amortization, $9.2 million milestone expense for in-process research and development, $13.8 million of non-cash lease expense, $152.4 million of stock-based compensation expense, $4.8 million premium amortization and discount accretion on investment securities, $0.9 million loss on investments, $1.2 million for amortization of debt discount and issuance cost, $0.3 million in other non-cash benefits, and $1.8 million of provision for credit losses offset by $0.2 million of inventory reserve adjustments.
The net loss of $547.8 million includes $199.3 million in non-cash charges resulting from $16.7 million of depreciation and amortization, $9.3 million milestone expense for in-process research and development, $13.8 million of non-cash lease expense, $152.4 million of stock-based compensation expense, $4.8 million premium amortization and discount accretion on investment securities, $0.9 million loss on investments, $1.3 million for amortization of debt discount and issuance cost, and $0.3 million in non-cash interest expense.
We used approximately $79.2 million of the net proceeds from the Convertible Notes offering to repay our obligations under the 2017 Term Loan with OrbiMed. Cash Flows The following table summarizes our cash flows for the periods indicated: Year Ended December 31, 2022 2021 2020 (in thousands) Cash used in operating activities $ (431,501) $ (335,236) $ (182,512) Cash provided by (used in) investing activities 330,338 (205,193) (331,461) Cash provided by financing activities 482,640 576,188 500,847 Net increase (decrease) in cash, cash equivalents and restricted cash 381,477 35,759 (13,126) Cash, cash equivalents and restricted cash, beginning of period 84,614 48,855 61,981 Cash, cash equivalents and restricted cash, end of year $ 466,091 $ 84,614 $ 48,855 Cash Used in Operating Activities Cash used in operating activities during the year ended December 31, 2022 was $431.5 million.
We used approximately $79.2 million of the net proceeds from the Convertible Notes offering to repay our obligations under the 2017 Term Loan with OrbiMed in 2020. Cash Flows The following table summarizes our cash flows for the periods indicated: Year Ended December 31, 2023 2022 2021 (in thousands) Cash used in operating activities $ (246,955) $ (431,501) $ (335,236) Cash provided by (used in) investing activities 168,498 330,338 (205,193) Cash provided by financing activities 254,461 482,640 576,188 Net change in cash, cash equivalents and restricted cash 176,004 381,477 35,759 Cash, cash equivalents and restricted cash, beginning of period 466,091 84,614 48,855 Cash, cash equivalents and restricted cash, end of year $ 642,095 $ 466,091 $ 84,614 Cash Used in Operating Activities Cash used in operating activities during the year ended December 31, 2023 was $247.0 million.
As noted in “Overview,” the number of tests that we process is a key metric as it tracks overall volume growth. During the year ended December 31, 2022, total reported units were approximately 1,919,600, comprised of approximately 1,861,000 tests reported in our laboratories.
As noted in “Overview,” the number of tests that we process is a key metric as it tracks overall volume growth. During the year ended December 31, 2023, total reported units were approximately 2,388,200, comprised of approximately 2,323,400 tests reported in our laboratories.
This was offset by a $6.8 million decrease in marketing expenses. Interest Expense Interest expense increased by $1.0 million, 12.2%, in the year ended December 31, 2022 compared to the same period in the prior year due to an increase in interest rate as well as a $30.0 million drawdown from November 2022 for the UBS Credit Line. 78 Table of Contents Interest and Other Income Interest and other income decreased by $1.8 million, or 34.3%, in the year ended December 31, 2022, compared to the same period in the prior year, primarily due to less interest income as a result of less investments held by the Company compared to the prior year. Liquidity and Capital Resources We have incurred net losses each year since our inception.
This was offset by a $9.1 million decrease in marketing costs and a $3.2 million net decrease in travel, facilities, office and other costs. Interest Expense Interest expense increased by $3.3 million, 35.6%, in the year ended December 31, 2023 compared to the same period in the prior year due to an increase in interest rate as well as a $30.0 million drawdown from November 2022 for the UBS Credit Line. 78 Table of Contents Interest and Other Income Interest and other income increased by $20.8 million, or 588.3%, in the year ended December 31, 2023, compared to the same period in the prior year, primarily due to higher interest rates and greater average cash and investment balances. Liquidity and Capital Resources We have incurred net losses each year since our inception.
Operating liabilities resulted in cash inflows of $49.0 million resulting from a $5.5 million increase in accounts payable, a $3.1 million increase in accrued compensation, a $47.7 million increase in other accrued liabilities, a $2.1 million increase in deferred revenue offset by a $9.4 million decrease in operating lease liabilities.
Operating liabilities resulted in cash inflows of $9.0 million resulting from a $21.6 million increase in accrued compensation, a $10.3 million increase in other accrued liabilities, and a $5.0 million increase in deferred revenue, offset by a $15.5 million decrease in accounts payable and a $12.4 million decrease in operating lease liabilities.
In September 2020, we completed an additional underwritten equity offering and sold 4,791,665 shares of our common stock at a price of $60 per share to the public. Before offering expenses of $0.3 million, we received proceeds of $271.0 million net of the underwriting discount.
In September 2023, we completed an underwritten equity offering and sold 4,550,000 shares of our common stock at a price of $55 per share to the public. Before offering expenses of approximately $0.4 million, we received proceeds of approximately $235.8 million net of the underwriting discount.
Cash used in operating activities during the year ended December 31, 2021 was $335.2 million.
Cash used in operating activities during the year ended December 31, 2022 was $431.5 million.
Please refer to Note 8, Commitments and Contingencies for further details. The following table summarizes our unconditional purchase and contractual commitments as of December 31, 2022: Payments Due by Period Less Than 1 to 3 3 to 5 More Than Total 1 Year Years Years 5 Years (in thousands) Short-term debt obligations (1) 80,000 80,000 — — — Long-term debt obligations (2) 287,500 — — 287,500 — Interest accrued on debt (3) 1,428 1,428 — — — Inventory purchase and other contractual obligations (4) 78,353 57,530 20,742 81 — Total $ 447,281 $ 138,958 $ 20,742 $ 287,581 $ — (1) Represents proceeds drawn from our Credit Line.
Please refer to Note 8, Commitments and Contingencies for further details. The following table summarizes our unconditional purchase and contractual commitments as of December 31, 2023: Payments Due by Period Less Than 1 to 3 3 to 5 More Than Total 1 Year Years Years 5 Years (in thousands) Short-term debt obligations (1) 80,000 80,000 — — — Long-term debt obligations (2) 287,500 — — 287,500 — Interest accrued on debt (3) 1,480 1,480 — — — Inventory purchase and other contractual obligations (4) 94,533 58,875 17,658 18,000 — Total $ 463,513 $ 140,355 $ 17,658 $ 305,500 $ — (1) Represents proceeds drawn from our Credit Line.
Operating assets had cash outflows of $133.6 million resulting from $124.1 million in increases in accounts receivable, $8.3 million in increases in inventory, and $1.2 million in increases in prepaid expenses and other current assets.
Operating assets had cash outflows of $131.4 million resulting from $122.3 million in increases in accounts receivable, $8.5 million in increases in inventory, and $1.2 million in increases in prepaid expenses and other current assets , offset by $0.6 million from cash inflows in operating lease right-of-use assets .
These expenses consist of personnel costs, including stock-based compensation expense; direct marketing expenses; audit and legal expenses; consulting costs; training and medical education activities; payer outreach programs and allocated overhead, including rent, information technology, equipment depreciation, and utilities. Interest Expense Interest expense is attributable to borrowing under our Convertible Senior Notes (the “Convertible Notes”) and credit line with UBS (the “Credit Line”), including the amortization of debt discounts. 74 Table of Contents Interest Income and Other (Expense) Income, Net Interest income and other (expense) income, net is comprised of interest earned on our cash, realized gains and losses on investments and assets, sublease rental income, and foreign currency remeasurement gains and losses. Loss on Debt Extinguishment The loss on debt extinguishment of $5.8 million was a result of the repayment of the outstanding principal and interest under the 2017 Term Loan with Orbimed in the second quarter of 2020.
These expenses consist of personnel costs, including stock-based compensation expense; direct marketing expenses; audit and legal expenses; consulting costs; training and medical education activities; payer outreach programs and allocated overhead, including rent, information technology, equipment depreciation, and utilities. Interest Expense Interest expense is attributable to borrowing under our Convertible Senior Notes (the “Convertible Notes”) and credit line with UBS (the “Credit Line”), including the amortization of debt discounts. 75 Table of Contents Interest Income and Other (Expense) Income, Net Interest income and other (expense) income, net is comprised of interest earned on our cash, realized gains and losses on investments and assets, sublease rental income, and foreign currency remeasurement gains and losses. Critical Accounting Policies Our management’s discussion and analysis of our financial condition and results of operations is based on our financial statements, which have been prepared in accordance with generally accepted accounting principles in the United States.
The decrease in revenue was primarily due to $28.6 million of revenue recognized from Qiagen associated with deferred revenues recognized as a result from a settlement with Qiagen in prior year partially offset by a $6.1 million net increase in revenue from our collaborative and royalty agreements . Cost of Product Revenues During the year ended December 31, 2022, cost of product revenues increased by $138.4 million or 43.9% when compared to the year ended December 31, 2021, primarily due to higher costs related to inventory consumption of $21.9 million driven by an increase in accessioned cases, a $58.6 million increase in third-party fees, a $14.2 million increase in shipping related charges due to higher volume, and a $43.7 million increase in labor and overhead costs driven by headcount growth and product support. Cost of Licensing and Other Revenues Cost of licensing and other revenues for the year ended December 31, 2022, when compared to the year ended December 31, 2021, decreased by approximately $0.6 million, or 18.6%, primarily due to a net decrease in costs to support our collaborative agreements. Research and Development Research and development expenses during the year ended December 31, 2022 increased by $52.2 million, or 19.8%, when compared to the year ended December 31, 2021.
The decrease was primarily due to a decrease in revenue from our collaborative agreements. Cost of Product Revenues During the year ended December 31, 2023, cost of product revenues increased by $134.9 million or 29.7% when compared to the year ended December 31, 2022, primarily due to higher costs related to inventory consumption of $42.1 million driven by an increase in accessioned cases, a $42.5 million increase in third-party fees, a $6.1 million increase in shipping related charges, a $10.7 million increase in equipment and related depreciation expense, and a $33.5 million increase in labor, overhead, and other related costs driven by headcount growth and product support. Cost of Licensing and Other Revenues Cost of licensing and other revenues for the year ended December 31, 2023, when compared to the year ended December 31, 2022, decreased by approximately $1.4 million, or 51.7%, primarily due to a net decrease in costs to support our collaborative agreements. Expenses Research and Development Research and development expenses during the year ended December 31, 2023 increased by $4.3 million, or 1.3%, when compared to the year ended December 31, 2022.
Revenue Recognition We recognize revenues when, or as, performance obligations in the contracts are satisfied, in the amount reflecting the expected consideration to be received from the goods or services transferred to the customers. Product Revenues Product revenues are derived from contracts with insurance carriers, laboratory partners and patients in connection with sales of prenatal genetic and other diagnostics tests.
Revenue Recognition We recognize revenues when, or as, performance obligations in the contracts are satisfied, in the amount reflecting the expected consideration to be received from the goods or services transferred to the customers.
The SOFR rate is variable. UBS has the right to demand full or partial payment of the Credit Line obligations and terminate it, in its discretion and without cause, at any time.
UBS has the right to demand full or partial payment of the Credit Line obligations and terminate it, in its discretion and without cause, 81 Table of Contents at any time. In October 2023, the interest rate was subsequently changed to the 30-day SOFR average, plus 0.5%.
As of December 31, 2022, the total principal amount outstanding with accrued interest was $80.4 million.
As of December 31, 2023, the total principal amount outstanding with accrued interest was $80.4 million and $20.0 million is remaining as available under the Credit Line.
This was offset by a net $27.0 million decrease in IPR&D expense mainly related to a $35.0 million upfront payment made in September 2021 upon acquisition, offset by an increase in accruals for the remaining milestones, and a $5.2 million decrease in consulting and legal fees. Selling, General and Administrative Selling, general and administrative expenses increased by $77.6 million, or 15.2%, in the year ended December 31, 2022 compared to the year ended December 31, 2021.
This was offset by a $12.7 million decrease in IPR&D expense mainly related to the milestone payments for the September 2021 acquisition, a $7.7 million decrease in consulting expenses, and a $6.6 million decrease in lab and clinical trial related expenses. Selling, General and Administrative Selling, general and administrative expenses increased by $29.7 million, or 5.0%, in the year ended December 31, 2023 compared to the year ended December 31, 2022.
Comparatively, during the year ended December 31, 2021, total reported units were approximately 1,453,500, comprised of approximately 1,400,100 tests reported in our laboratories. During the year ended December 31, 2022 and 2021, total oncology units processed were approximately 196,400 and 76,400, respectively.
Comparatively, during the year ended December 31, 2022, total reported units were approximately 1,919,600, comprised of approximately 1,861,000 tests reported in our laboratories.
We enter into contracts with insurance carriers with primarily payment terms related to tests provided to the patients who have health insurance coverage. Insurance carriers are considered to be third-party payers on behalf of the patients, and the patients are considered as the customers who receive genetic test services.
Insurance carriers are considered to be third-party payers on behalf of the patients, and the patients are considered as the customers who receive genetic test services. Tests may be billed to insurance carriers, patients, or a combination of insurance carriers and patients.
Operating assets had cash outflows of $54.0 million resulting from $43.4 million in increases in accounts receivable, $7.5 million in increases in inventory, and $0.2 million in increases in prepaid expenses and $2.9 million in increases of other current assets.
Operating assets had cash outflows of $57.0 million resulting from $33.9 million in increases in accounts receivable, $5.4 million in increases in inventory, and $26.1 million in increases in prepaid expenses and other current assets, offset by $8.4 million 80 Table of Contents from cash inflows in operating lease right-of-use assets.
Because our revenues from Horizon continue to represent a significant proportion of our overall revenues, a decline in our reimbursement rates for, and therefore our average selling price of, Horizon, could result in a decline in our overall revenue. Entering into in-network contracts continues to be an important part of our business strategy, as we believe that in-network coverage of our tests by third-party payers is crucial to our growth and long-term success, as in-network pricing is more predictable than out-of-network pricing, enables us to develop stable, long-term relationships with third-party payers, and provides access to a larger population of covered lives.
Many third-party payers do not currently reimburse for microdeletions screening in part because there has historically been limited published data on the performance of microdeletions screening tests, with our SMART study results being published relatively recently, in early 2022. Entering into in-network contracts continues to be an important part of our business strategy, as we believe that in-network coverage of our tests by third-party payers is crucial to our growth and long-term success, as in-network pricing is more predictable than out-of-network pricing, enables us to develop stable, long-term relationships with third-party payers, and provides access to a larger population of covered lives.
The net loss of $471.7 million includes $182.5 million in non-cash charges resulting from $11.3 million of depreciation and amortization, $35.6 million expense of in-process research and development, $10.9 million of non-cash lease expense, $115.2 million 80 Table of Contents of stock-based compensation expense, $0.6 million of inventory reserve adjustments, $7.8 million premium amortization and discount accretion on investment securities, $1.2 million for amortization of debt discount and issuance cost, $0.1 million in other non-cash benefits, offset by $0.2 million of provision for credit losses.
The net loss of $434.8 million includes $235.8 million in non-cash charges resulting from $24.1 million of depreciation and amortization, $2.7 million milestone expense for in-process research and development, $14.5 million of non-cash lease expense, $191.8 million of stock-based compensation expense, $1.1 million premium amortization and discount accretion on investment securities, $0.3 million in foreign exchange adjustment, and $1.3 million for amortization of debt discount.
Product Revenues 77 Table of Contents During the year ended December 31, 2022, product revenues increased by $217.2 million, or 37.4% compared to the year ended December 31, 2021, as a result of the continued revenue growth from increased test volumes. Licensing and Other Revenues Licensing and other revenues decreased by $22.5 million, or 49.5%, during the year ended December 31, 2022 compared to the year ended December 31, 2021.
During the year ended December 31, 2023 and 2022, total oncology units processed were approximately 340,700 and 196,400, respectively. 77 Table of Contents Product Revenues During the year ended December 31, 2023, product revenues increased by $271.2 million, or 34.0% compared to the year ended December 31, 2022, as a result of the continued revenue growth from increased test volumes as well as average selling price improvements. Licensing and Other Revenues Licensing and other revenues decreased by $8.9 million, or 38.7%, during the year ended December 31, 2023 compared to the year ended December 31, 2022.
The contractual obligations also include the potential earnout payment from our IPR&D asset acquisition less the portion accrued on the Balance Sheet. Payments due upon cancellation generally consist only of payments for services provided or expenses incurred, including non-cancellable obligations of our service providers, up to the date of cancellation.
Payments due upon cancellation generally consist only of payments for services provided or expenses incurred, including non-cancellable obligations of our service providers, up to the date of cancellation. These payments have not been included separately within these contractual and other obligations disclosures.
The increase was driven by a $61.8 million increase in salary and related expenditures primarily due to headcount growth, which includes a $20.7 million increase in stock-based compensation expense, a $19.2 million increase in clinical trial expenses, and an increase of $3.4 million of marketing, travel, facilities, office and other costs to support increases in the Company’s headcount , new product offerings and research and development project pipeline.
The increase was driven by a $27.7 million increase in salary and related expenditures, which includes a $20.4 million increase in stock-based compensation expense, and a $3.6 million net increase in office, facilities, and other expenses.
Credit Line Agreement In September 2015, we entered into a Credit Line with UBS (“the Credit Line”) providing for a $50.0 million revolving line of credit which could be drawn in increments at any time.
Based on our current business plan, we believe that our existing cash and marketable securities will be sufficient to meet our anticipated cash requirements for at least 12 months after February 28, 2024. 79 Table of Contents Credit Line Agreement In September 2015, we entered into a Credit Line with UBS, or the Credit Line, providing for a $50.0 million revolving line of credit which could be drawn in increments at any time.
The increase was attributable to an increase of $48.7 million in salary and related expenditures primarily due to headcount growth to support new product offerings, which includes a $13.5 million increase in stock-based compensation expense, a $11.1 million increase in travel related costs, a $10.5 million increase from consulting and legal related costs, and a $14.1 million increase related to business support including business insurance, billing services, facilities, office and other costs to support increases in the Company’s headcount and new product offerings.
The increase was attributable to a $18.0 million increase in consulting and legal expenses, a $16.0 million increase in third party billing expenses, and a net increase of $8.0 million in salary and related compensation expenditures primarily related to an increase in stock-based compensation expense.
In addition to our direct sales force in the United States, we have a global network of over 100 laboratory and distribution partners, including many of the largest international laboratories. We currently provide a comprehensive suite of products in women’s health, as well as our oncology and organ health products, and our Constellation cloud-based platform.
We aim to make personalized genetic testing and diagnostics part of the standard of care to protect health and inform earlier and more targeted interventions that help lead to longer, healthier lives. We currently provide a comprehensive suite of products in women’s health, as well as our oncology and organ health products, and our Constellation cloud-based platform.