Comparison of the nine months ended September 30, 2022 to the nine months ended September 30, 2021
Grant Revenues. Grant revenues for the nine months ended September 30, 2022 and 2021 were $186,661 and $447,794, respectively. The grant revenues relate primarily to a $1.2 million subcontract with DTI discussed above.
Cost of Grant Revenues. Cost of grant revenues for the nine months ended September 30, 2022 and 2021 was $186,661 and $447,794, respectively. The cost of grant revenues relates primarily to the subcontract with DTI discussed above and is equal to the associated grant revenues resulting in no gross profit.
Research and Development Expenses. Research and development expenses increased by $911,032, or 64%, to $2,337,081 in the nine months ended September 30, 2022 from $1,426,049 in the nine months ended September 30, 2021. The increase was due to higher semiconductor fabrication costs of $349,537, stock-based compensation expense of $224,812, component costs, primarily wafers, of $212,043, professional fees of $118,181 and other B-TRAN™ spending of $6,459. In the nine months ended September 30, 2021, our semiconductor fabrication costs were partially funded by government grants. In the nine months ended September 30, 2022, almost all of our semiconductor fabrication costs were not funded by government grants.
General and Administrative Expenses. General and administrative expenses increased by $651,397, or 38%, to $2,356,543 in the nine months ended September 30, 2022 from $1,705,146 in the nine months ended September 30, 2021. The increase was due to higher investor relations spending, inclusive of services paid in stock, of $185,908, stock-based compensation expense of $147,249, Board search and placement fees and expenses of $85,942, a compensation benchmarking study costing $69,550, higher insurance of $35,518, audit fees of $28,047, Board fees and expenses of $26,295 and other costs of $72,888.
Sales and Marketing Expenses. Sales and marketing expenses increased by $357,165, or 118%, to $660,024 in the nine months ended September 30, 2022 from $302,859 in the nine months ended September 30, 2021. The increase was due to higher personnel costs of $184,361, as we hired our first two sales and marketing employees in 2021, stock-based compensation of $76,554, travel costs of $35,732, professional fees of $22,977 and other spending of $37,541.
Loss from Operations. Our loss from operations for the nine months ended September 30, 2022 was $5,353,648, or 56% higher, than the $3,434,054 loss from operations for the nine months ended September 30, 2021 for the reasons discussed above.
Other Income. Other income was $55,243 for the nine months ended September 30, 2022 compared to $84,533 for the nine months ended September 30, 2021. Other income in the nine months ended September 30, 2022 related to higher interest income, due to the impact of higher interest rates, on our money market account. Other income in the nine months ended September 30, 2021 related primarily to a gain on forgiveness of long-term debt of $91,407.
Net Loss. Our net loss for the nine months ended September 30, 2022 was $5,298,405, or 58% higher, as compared to a net loss of $3,349,521 for the nine months ended September 30, 2021, for the reasons discussed above.
Liquidity and Capital Resources
We currently generate grant revenue only. We expect to generate grant revenue and potentially commercial revenue in late 2022, depending on the timing of any development agreements that we may enter into with potential customers. We have incurred losses since inception. We have funded our operations to date through the sale of common stock and warrants.
At September 30, 2022, we had cash and cash equivalents of $18.5 million. Our net working capital at September 30, 2022 was $18.3 million. We had no outstanding debt at September 30, 2022. Accordingly, we expect that our cash and cash equivalents will be sufficient to fund our activities for at least the next twelve months from the date of filing this Quarterly Report on Form 10-Q; however, we may require additional funds to fully implement our plan of operation and business strategy.