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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Cash flows used in operating activities: |  |  |
Net loss | $ (3,261) | $ (4,805) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 155 | 158 |
Amortization of deferred financing costs and debt discount | 16 | 66 |
Share-based compensation expense | 146 | 140 |
Accretion of discount on short-term investments | 1 |  |
Reduction in the carrying amount of operating lease right-of-use assets | 31 | 29 |
Loss on disposal of property and equipment |  | 2 |
Increases (decreases) in cash caused by changes in operating assets and liabilities: |  |  |
Other current assets | 150 | 2,791 |
Accounts payable and accrued expenses | (43) | (3,639) |
Change in operating lease liabilities | (31) | (29) |
Deferred grant liability | (1,677) | (506) |
Net cash used in operating activities | (4,513) | (5,793) |
Cash flows used in investing activities: |  |  |
Purchases of property and equipment | (40) | (97) |
Purchase of short-term investments | (324) |  |
Net cash used in investing activities | (364) | (97) |
Cash flows used in/provided by financing activities: |  |  |
Principal payments of term loan obligation | (402) | (402) |
Purchase of treasury stock | (374) |  |
Proceeds from sale of common stock, net |  | 895 |
Net cash (used in) provided by financing activities | (776) | 493 |
Net decrease in cash and cash equivalents | (5,653) | (5,397) |
Cash and cash equivalents at beginning of period | 8,554 | 18,120 | $ 18,120
Cash and cash equivalents at end of period | 2,901 | 12,723 | $ 8,554
Cash paid during period for: |  |  |
Interest | 23 | 73 |
Supplemental schedule of non-cash investing and financing activities: |  |  |
Unpaid offering cost | $ 141 | 25 |
Right-of-use assets obtained in exchange for operating lease liability |  | $ 51 |

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