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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Cash flows used in operating activities: |  |  |  |  |  |  |
Net loss | $ (2,940) | $ (3,261) | $ (1,482) | $ (4,805) | $ (6,201) | $ (6,287) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  | 325 | 318 |
Amortization of deferred financing costs and debt discount |  |  |  |  | 20 | 119 |
Share-based compensation expense |  |  |  |  | 297 | 280 |
Accretion of discount on short-term investments |  |  |  |  | (23) |  |
Non-cash financing expense |  |  |  |  | 3,545 |  |
Change in fair value of warrants | (4,694) |  |  |  | (4,694) |  |
Loss on disposal of property and equipment |  |  |  |  |  | 2 |
Amortization of operating lease right-of-use assets |  |  |  |  | 63 | 57 |
Increases (decreases) in cash caused by changes in operating assets and liabilities: |  |  |  |  |  |  |
Grant receivable |  |  |  |  |  | 718 |
Other current assets |  |  |  |  | 335 | 1,510 |
Accounts payable and accrued expenses |  |  |  |  | 360 | (3,589) |
Change in operating lease liabilities |  |  |  |  | (63) | (56) |
Deferred grant liability |  |  |  |  | 373 | (1,643) |
Net cash used in operating activities |  |  |  |  | (5,663) | (8,571) |
Cash flows used in investing activities: |  |  |  |  |  |  |
Purchases of property and equipment |  |  |  |  | (121) | (108) |
Purchase of short-term investments |  |  |  |  | (3,500) |  |
Purchase of intangible assets |  |  |  |  | (545) |  |
Net cash used in investing activities |  |  |  |  | (4,166) | (108) |
Cash flows provided by financing activities: |  |  |  |  |  |  |
Principal payments of term loan obligation |  |  |  |  | (3,996) | (804) |
Proceeds from credit facility |  |  |  |  | 3,292 |  |
Purchase of treasury stock |  |  |  |  | (374) |  |
Proceeds from sale of common stock, warrants and pre-funded warrants, net |  |  |  |  | 7,265 | 2,258 |
Net cash provided by financing activities |  |  |  |  | 6,187 | 1,454 |
Net decrease in cash and cash equivalents |  |  |  |  | (3,642) | (7,225) |
Cash and cash equivalents at beginning of period |  | $ 8,554 |  | $ 18,120 | 8,554 | 18,120 | $ 18,120
Cash and cash equivalents at end of period | $ 4,912 |  | $ 10,895 |  | 4,912 | 10,895 | $ 8,554
Cash paid during period for: |  |  |  |  |  |  |
Interest |  |  |  |  | 32 | 135 |
Supplemental schedule of non-cash investing and financing activities: |  |  |  |  |  |  |
Unpaid offering cost |  |  |  |  | $ 375 | $ 35 |

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