Service revenue was $30.1 million for the nine months ended September 30, 2023, compared to $25.7 million for the nine months ended September 30, 2022, an increase of $4.3 million, or 17%. This increase was primarily due to a $6.7 million increase in Accelerator Laboratory revenue due to higher volumes of sample testing and assay development services and a $1.0 million increase in extended service-type warranties, which were partially offset by a $3.7 million decrease in revenue recognized from the Lilly Collaboration Agreement.
Collaboration and license revenue was $1.2 million for the nine months ended September 30, 2023, compared to $0.5 million for the nine months ended September 30, 2022, an increase of $0.8 million, or 158%. The increase was primarily due to a $0.5 million one-time increase from the expiration of a previously paid for option to expand the scope of the Abbott License Agreement.
Grant revenue was $0.9 million for the nine months ended September 30, 2023, compared to $0.4 million for the nine months ended September 30, 2022, an increase of $0.5 million or 146%. This increase was due to the receipt of a portion of the NIH Grant.
Cost of Goods Sold and Services
Cost of goods sold and services decreased $8.5 million, or 19%, to $37.0 million for the nine months ended September 30, 2023 compared to $45.5 million for the nine months ended September 30, 2022.
Cost of product revenue decreased $8.6 million, or 27%, to $22.6 million for the nine months ended September 30, 2023, compared to $31.2 million for the nine months ended September 30, 2022. The decrease was primarily due to improvement in inventory management and manufacturing processes and lower instrument sales.
Cost of service revenue was consistent with the prior period with an increase of $0.1 million, or less than 1%, to $14.4 million for the nine months ended September 30, 2023, compared to $14.3 million for the nine months ended September 30, 2022, primarily due to the increase in Accelerator Laboratory revenue at higher margins.
Research and Development
Research and development expense decreased $2.4 million, or 12%, to $17.9 million for the nine months ended September 30, 2023, compared to $20.3 million for the nine months ended September 30, 2022. This decrease was primarily due to a decrease in compensation and benefit costs related to the reduction in headcount from the Restructuring Plan, which was partially offset by an increase in license fees and professional services to enable product development.
Selling, General, and Administrative
Selling, general and administrative expense decreased $6.7 million, or 9%, to $66.1 million for the nine months ended September 30, 2023, compared to $72.7 million for the nine months ended September 30, 2022. The decrease was primarily due to a decrease in compensation and benefit costs related to the reduction in headcount in from the Restructuring Plan and a full nine months of facilities costs from the leased office and laboratory facilities we are no longer utilizing being recorded in other lease costs instead of selling, general, and administrative expenses on the Consolidated Statements of Operations. These decreases were partially offset by an increase in professional services and consulting fees related to our efforts to remediate the previously disclosed material weaknesses identified in 2022 and other services, and a increase in shipping and handling costs for consumables and other products due to higher volume. Included within selling, general and administrative expense are $6.0 million and $5.3 million of shipping and handling costs for product sales for the nine months ended September 30, 2023 and 2022, respectively.
Other Lease Costs
Other lease costs increased $2.1 million, or 343%, to $2.7 million for the nine months ended September 30, 2023, compared to $0.6 million for the nine months ended September 30, 2022. As part of the Restructuring Plan, we are not utilizing the leased office and laboratory facilities in Bedford, Massachusetts and are