Comparison of the six months ended June 30, 2022 to the six months ended June 30, 2021
Grant Revenues. Grant revenues for the six months ended June 30, 2022 and 2021 were $175,986 and $326,766, respectively. The grant revenues relate primarily to a $1.2 million subcontract with DTI discussed above.
In September 2021, we entered into and began work under a $50,000 subcontract with DTI under a Phase I Small Business Innovation Research (“SBIR”) grant from the U.S. Department of Energy to develop a B-TRAN™-driven low loss alternating current SSCB. We completed our work under this subcontract in February 2022.
Cost of Grant Revenues. Cost of grant revenues for the six months ended June 30, 2022 and 2021 was $175,986 and $326,766, respectively. The cost of grant revenues relates to the subcontracts with DTI discussed above and are equal to the associated grant revenues resulting in no gross profit.
Research and Development Expenses. Research and development expenses increased by $735,357, or 90%, to $1,556,930 in the six months ended June 30, 2022 from $821,573 in the six months ended June 30, 2021. The increase was due to higher semiconductor fabrication costs of $365,598, stock-based compensation expense of $152,865, personnel costs of $110,903, wafer and driver component costs of $96,594 and other B-TRAN™ spending of $9,397. In the six months ended June 30, 2021, our semiconductor fabrication costs were partially funded by government grants. In the six months ended June 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 $383,382, or 32%, to $1,587,586 in the six months ended June 30, 2022 from $1,204,204 in the six months ended June 30, 2021. The increase was due to higher investor relations spending, inclusive of services paid in stock, of $109,770, stock-based compensation expense of $101,275, Board search and placement fees and expenses of $91,495, professional fees of $31,645, insurance of $23,448 and other costs of $25,749.
Sales and Marketing Expenses. Sales and marketing expenses increased by $277,970, or 159%, to $452,581 in the six months ended June 30, 2022 from $174,611 in the six months ended June 30, 2021. The increase was due to higher personnel costs of $138,534, as we hired our first two sales and marketing employees in 2021, stock-based compensation of $54,455, travel costs of $29,056, professional fees of $23,800 and other spending of $32,125.
Loss from Operations. Our loss from operations for the six months ended June 30, 2022 was $3,597,097, or 63% higher, than the $2,200,388 loss from operations for the six months ended June 30, 2021 for the reasons discussed above.
Other Income. Other income was $2,462 for the six months ended June 30, 2022 compared to $89,545 for the six months ended June 30, 2021. The other income in the six months ended June 30, 2021 related primarily to a gain on forgiveness of long-term debt of $91,407.
Net Loss. Our net loss for the six months ended June 30, 2022 was $3,594,635, or 70% higher, as compared to a net loss of $2,110,843 for the six months ended June 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 ultimate date that our initial product is introduced for commercial sale and 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 June 30, 2022, we had cash and cash equivalents of $20.0 million. Our net working capital at June 30, 2022 was $19.9 million. We had no outstanding debt at June 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.