Liquidity and Capital Resources
At June 30, 2023, our cash and cash equivalent balance totaled $7,600 thousand compared to $6,451 thousand at December 31, 2022, an increase of $1,149 thousand. The increase in cash and cash equivalent balance is primarily attributable to the change of short-term held-to-maturity investments. At June 30, 2023, our short-term held-to-maturity investments totaled $931 thousand, which is a decrease of $1,675 thousand compared to $2,606 thousand at December 31, 2022.
At June 30, 2023, our current assets were in excess of current liabilities resulting in working capital of $6,107 thousand as compared to $8,586 thousand at December 31, 2022. We have no contractual debt obligations, and the Company has sufficient working capital to fund current operating expenses for over twelve months. To the extent the Company requires additional funds more than 12 months from the date hereof, and customer cash collections cannot fund our needs, the Company may utilize equity offerings. Historically, the Company has funded operations predominately through equity offerings.
Currently, the Company can sell shares of common stock through its ATM program. As of June 30, 2023, the remaining aggregate offering price for future sales of common stock on the ATM is approximately $8.7 million, subject to the SEC’s “baby shelf rules,” which prohibits companies with a public float of less than $75 million from issuing securities under a shelf registration statement in excess of one-third of such company’s public float in a 12-month period (for more details, see “Note 6 – Equity” in the notes to our condensed consolidated financial statements). Future sales of shares of common stock and the price at which we may be able to sell such shares of common stock under the ATM are dependent on factors beyond our control, including, but not limited to, market conditions, the trading price of our common stock and our capital needs.
We filed a Form S-3 shelf registration statement with the SEC on July 1, 2022 that was declared effective on August 12, 2022.The registration statement on Form S-3 allows us to offer common stock, preferred stock, warrants, subscription rights, debt securities and units from time to time, as market conditions permit to fund, to the extent required beyond the 12 months from the date hereof, the ongoing operations of the Company. Until the growth of revenue increases to a level that covers operating expenses, the Company intends to continue to fund operations in this manner, although, the volatility in the capital markets and potential upcoming recession may negatively affect our ability to do so.
Operating activities for the six months ended June 30, 2023, resulted in cash outflows of $508 thousand, primarily due to the loss for the period of $2,907 thousand, offset with non-cash expenses of $471 thousand, and an increase of $1,858 thousand of contract liabilities, which represents payments from customers in advance of future project costs.
Operating activities for the six months ended June 30, 2022, resulted in cash outflows of $3,347 thousand, primarily due to the loss for the period of $3,128 thousand, offset with non-cash expenses of $179 thousand.
Investing activities for the six months ended June 30, 2023, resulted in cash inflows of $1,684 thousand, which is primarily attributable to the redemption $3,897 thousand of short-term held-to-maturity U.S. treasuries, offset by $2,162 thousand of purchases for the same type of investments.
Investing activities for the six months ended June 30, 2022, resulted in cash outflows of $78 thousand in disbursements for fixed and intangible assets, and cash inflows of $37 thousand in proceeds from fixed asset sales.
Financing activities for the six months ended June 30, 2023, included $15 thousand in disbursements for taxes paid related to vesting of employee restricted stock units.
Financing activities for the six months ended June 30, 2022, included $4,798 thousand in net proceeds from the sale of 501 thousand shares of our common stock through our ATM program at an average price of $1.24 per share, and sale of 4.2 million shares of our common stock through a public offering at an average price of $1.11 per share.