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Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities: |  |  |  |
Net loss | $ (2,009) | $ (1,346) | $ (5,339) | $ (9,926)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
Depreciation | 3 | 4 | 15 | 20
Amortization of right-of-use asset – operating | 16 | 25 | 96 | 94
Share-based compensation | 114 | 204 | 686 | 556
Loss from disposal of property and equipment |  |  |  | 5
Change in operating assets and liabilities: |  |  |  |
Other current assets | (606) | (598) | 93 | 808
Other assets |  |  | 6 |
Accounts payable | 167 | 32 | 28 | (783)
Accrued compensation and employee benefits | (16) | 62 | (73) | (752)
Accrued expenses and other liabilities | 803 | 22 | (526) | (934)
Net cash used in operating activities | (1,528) | (1,595) | (5,014) | (10,912)
Cash flows from investing activities: |  |  |  |
Purchase of property and equipment |  |  |  | (2)
Net cash used in investing activities |  |  |  | (2)
Cash flows from financing activities: |  |  |  |
Net cash provided by financing activities |  |  |  |
Net decrease in cash and cash equivalents | (1,528) | (1,595) | (5,014) | (10,914)
Cash and cash equivalents, beginning of year | 37,431 | 42,445 | 42,445 | 53,359
Cash and cash equivalents, end of year | 35,903 | 40,850 | 37,431 | 42,445
Supplemental cash flow information: |  |  |  |
Interest paid |  |  |  |
Income tax refund received |  |  |  |
Supplemental disclosure of noncash investing and financing transactions: |  |  |  |
Leased assets and operating lease liabilities – amended lease term | $ 214 |  |  |

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-2 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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