Net revenue for the fourth quarter of 2024, as compared to 2023, decreased $37.4 million primarily due to the Company’s divestiture of CIMERLI® and YUSIMRY®, partially offset by an increase in UDENYCA and LOQTORZI net sales.
For the full year 2024, UDENYCA net revenue increased $78.9 million primarily due to increased market share, offset by a change in UDENYCA segment mix and the impact of the fourth quarter temporary UDENYCA supply interruption. The $98.3 million decrease in net revenues of CIMERLI was primarily the result of the CIMERLI Sale. LOQTORZI net revenue reflects initial sales beginning in December 2023 following FDA approval. Other revenue in 2024 included $6.3 million for the sale to Apotex of rights to commercialize toripalimab within Canada.
Cost of goods sold (COGS) was $33.9 million and $84.6 million during the three months ended December 31, 2024 and 2023, respectively, and $117.6 million and $159.0 million during the years ended December 31, 2024 and 2023, respectively. The decrease in COGS for the fourth quarter of 2024 compared to the same period in the prior year was primarily due to the $47.0 million charge in 2023 related to slow moving YUSIMRY inventory and products that were divested during the first half of 2024.
The decrease in cost of goods sold in the full year 2024 compared to 2023 was primarily due to a decrease of $56.9 million in costs from CIMERLI, which was divested during the first quarter of 2024 and a $47.0 million charge in the fourth quarter of 2023 related to slow moving YUSIMRY inventory. These decreases were partially offset by a $59.6 million increase in costs related to UDENYCA and LOQTORZI in 2024, which includes $14.1 million in charges for the write-down of UDENYCA inventory that did not meet acceptance criteria.
Research and development (R&D) expenses were $21.2 million and $26.4 million for the three months ended December 31, 2024 and 2023, respectively, and $93.3 million and $109.4 million for the years ended December 31, 2024 and 2023, respectively. The decreases were primarily due to savings from reduced headcount and lower costs related to biosimilar product divestitures, partially offset by increased costs for development of casdozokitug and CHS-114.
Selling, general and administrative (SG&A) expenses were $41.3 million and $49.5 million during the three months ended December 31, 2024 and 2023, respectively, and $167.7 million and $192.0 million during the years ended December 31, 2024 and 2023, respectively. The declines compared to the prior year periods were driven primarily by lower headcount and decreased operating costs following divestitures. The decrease for the year was partially offset by the net $6.8 million charge in the first quarter of 2024 associated with the full write-off of the outlicense intangible asset and associated release of the CVR liability related to NZV930, that was acquired in the Surface Oncology, Inc. acquisition and $6.7 million in divestiture-related costs incurred in the fourth quarter 2024.
Interest expense was $5.3 million and $10.6 million during the three months ended December 31, 2024 and 2023, respectively, and $27.2 million and $40.5 million during the years ended December 31, 2024 and 2023, respectively. The declines in both periods were primarily due to fully paying off the $250.0 million principal amount of the 2027 Term Loans in the second quarter 2024, partially offset by interest on the revenue participation right purchase and sale agreement and the $38.7 million principal amount of the senior secured term loan facility, both commencing May 8, 2024.
Gain on sale transactions, net was $176.6 million for the year ended December 31, 2024 and included a $153.8 million gain on the first quarter 2024 divestiture of our CIMERLI ophthalmology franchise and a $22.8 million gain on the second quarter 2024 divestiture of our YUSIMRY immunology franchise.
Net income (loss) for the fourth quarter of 2024 was a net loss of $50.7 million, or $(0.44) per share on a diluted basis, compared to a net loss of $79.7 million, or $(0.71) per share on a diluted basis for the same period in 2023. Net income for the year ended December 31, 2024 was $28.5 million, or $0.25 per share on a diluted basis, compared to a net loss of $237.9 million, or $(2.53) per share on a diluted basis for year ended December 31, 2023.
Non-GAAP net loss for the fourth quarter of 2024 was $32.5 million, or $(0.28) per share on a diluted basis, compared to $68.9 million, or $(0.62) per share for the same period in 2023. Non-GAAP net loss for the year ended December 31, 2024 was $86.3 million, or $(0.75) per share on a diluted basis, compared to $186.2 million, or $(1.98)