Licensing revenue for the fourth quarter of 2022 was $930,355, compared to $8,000 in the fourth quarter of 2021. The increase in licensing revenue represents collection of minimum royalties due from Reprise Biomedical, Inc. ("Reprise") for 2020 and 2022. The remainder of minimum royalties due from Reprise for 2021 has been deferred to 2023.
Cost of goods sold was $125,000 for both the fourth quarter of 2022 and 2021. Cost of goods sold for both periods relates to the minimum royalty due to the University of Minnesota under our license agreement.
Operating loss for the fourth quarter of 2022 was $7.180 million, compared to $5.465 million in the fourth quarter of 2021. The increase in operating loss for comparable periods was primarily attributable to increased research and development costs and general and administrative costs; notably, cost increases relating to payroll, lab supplies and costs associated with being a public company.
Net loss for the fourth quarter of 2022 was $6.946 million, or $0.33 per share, compared to $5.476 million, or $0.27 per share in the fourth quarter of 2021. The increase in net loss for comparable periods was primarily attributable to the same cost increases described within operating loss above.
Full Year 2022 Financial Results
Licensing revenue for 2022 was $953,470, compared to $33,066 in 2021. The increase in licensing revenue represents collection of minimum royalties due from Reprise for 2020 and 2022. The remainder of minimum royalties due from Reprise for 2021 has been deferred to 2023.
Cost of goods sold was $500,000 for both 2022 and 2021. Cost of goods sold for both periods relates to the minimum royalty due to the University of Minnesota under our license agreement.
Operating loss for 2022 was $30.364 million, compared to $16.965 million in 2021. The increase in operating loss was primarily attributable to increased research and development costs and general and administrative costs; notably, cost increases relating to payroll, lab supplies and costs associated with being a public company.
Net loss for 2022 was $29.960 million, or $1.45 per share, compared to $14.671 million, or $1.28 per share in 2021. The increase in net loss was primarily attributable to the same cost increases described within operating loss above, plus one-time gains recognized in the first quarter of 2021 that impacted the full-year comparison.
The increase in weighted average shares used in computing net loss per share for 2022 compared to 2021 is attributable to the issuance of IPO shares in June 2021.