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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Cash flows used in operating activities: |  |  |  |  |  |  |
Net loss | $ (1,482) | $ (4,805) | $ (5,282) | $ (4,116) | $ (6,287) | $ (9,398) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  | 318 | 302 |
Amortization of deferred financing costs and debt discount |  |  |  |  | 119 | 218 |
Change in fair value of liability instruments |  |  |  |  |  | (1) |
Loss on disposal of property and equipment |  |  |  |  | 2 |  |
Stock-based compensation expense |  |  |  |  | 280 | 347 |
Amortization of operating lease right-of-use assets |  |  |  |  | 57 | 38 |
Increases (decreases) in cash caused by changes in operating assets and liabilities: |  |  |  |  |  |  |
Grant Receivable |  |  |  |  | 718 |  |
Other current assets |  |  |  |  | 1,510 | 525 |
Accounts payable and accrued expenses |  |  |  |  | (3,589) | 1,527 |
Change in operating lease liabilities |  |  |  |  | (56) | (74) |
Deferred revenue |  |  |  |  | (1,643) |  |
Net cash used in operating activities |  |  |  |  | (8,571) | (6,516) |
Cash flows used in investing activities: |  |  |  |  |  |  |
Purchases of property and equipment |  |  |  |  | (108) | (348) |
Purchase of intangible assets |  |  |  |  |  | (117) |
In process research and development acquired |  |  |  |  |  | (250) |
Net cash used in investing activities |  |  |  |  | (108) | (715) |
Cash flows from financing activities: |  |  |  |  |  |  |
Principal payments of term loan obligation |  |  |  |  | (804) | (804) |
Proceeds from sale of common stock, net |  |  |  |  | 2,258 | 7,725 |
Net cash provided by financing activities |  |  |  |  | 1,454 | 6,921 |
Net decrease in cash and cash equivalents |  |  |  |  | (7,225) | (310) |
Cash and cash equivalents at beginning of period |  | $ 18,120 |  | $ 18,400 | 18,120 | 18,400 | $ 18,400
Cash and cash equivalents at end of period | $ 10,895 |  | $ 18,090 |  | 10,895 | 18,090 | $ 18,120
Cash paid during period for: |  |  |  |  |  |  |
Interest |  |  |  |  | 135 | 168 |
Supplemental schedule of non-cash investing and financing activities: |  |  |  |  |  |  |
Unpaid offering cost |  |  |  |  | $ 35 | $ 50 |

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