marketplace and our strong balance sheet and reduced cash burn, we are well-positioned to build on our momentum in 2023,” Andreeff concluded.
Fourth Quarter 2022 Financial Results
Total revenue for the fourth quarter of 2022 was $282 thousand, an increase of 9% compared to $258 thousand in the fourth quarter of 2021 and was comprised primarily of product sales in both periods.
Cost of revenues was $150 thousand for the three months ended December 31, 2022, compared to $129 thousand for the comparable period in 2021, primarily due to increased revenues.
Gross profit for the fourth quarter of 2022 was $132 thousand, compared to gross profit of $129 thousand in the fourth quarter of 2021.
Operating expenses for the fourth quarter of 2022 decreased to $2.8 million, compared to $4.2 million in the fourth quarter of 2021. The decrease was primarily the result of lower product development and clinical trial activities following the U.S. commercial launch of PoNS.
Operating loss for the fourth quarter of 2022 decreased $1.4 million to a loss of $2.7 million, compared to an operating loss of $4.1 million in the fourth quarter of 2021.
Net loss was $4.9 million for the fourth quarter of 2022, compared to a net loss of $4.1 million in the corresponding prior year period. The basic and diluted net loss per share for the fourth quarter 2022 was $0.17, compared to net loss per share of $1.31 in the fourth quarter 2021.
Full Year 2022 Financial Results
Total revenue for the full year 2022 was $787 thousand, compared to $522 thousand for the full year 2021, reflecting the U.S. commercial launch of PoNS for MS in April 2022, partially offset by a decrease in product sales in Canada, mostly attributable to lower Canadian to U.S. dollar translation rates during 2022.
Cost of revenue for the full year 2022 increased $165 thousand to $463 thousand, compared to cost of revenue of $298 thousand for the full year 2021, primarily attributable to overhead costs, including salaries and benefits of employees involved in management of the supply chain, and inventory-related cost of sales due to higher sales volume.
Gross profit for the full year 2022 was $324 thousand, compared to gross profit of $224 thousand for the full year 2021.
Operating expenses for the full year 2022 decreased $2.5 million to $15.8 million, compared to $18.4 million for the full year 2021, due primarily to a $2.0 million decrease in stock-based compensation expense and a decrease in product development and clinical trial expenses as we transitioned from product development and clinical trials to U.S. commercialization activities, partially offset by increased compensation expenses related to personnel additions in late 2021 and early in 2022 to support the U.S. commercial launch.
Operating loss for the full year 2022 decreased $2.6 million to $15.5 million, compared to $18.1 million for the full year 2021.
Net loss for the full year 2022 was $14.1 million, compared to $18.1 million for the full year 2021. The basic and diluted net loss per share for the full year 2022 was $1.04 per share, compared to $7.38 per share, for the full year 2021.