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Leases (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Leases [Abstract] |  |
Schedule of Finance and Operating Lease Assets and Lease Liabilities | Finance and operating lease assets and lease liabilities are as follows:
Lease Classification |  | Classification |  | Three months ended March 31, 2024 |  |  | Year-ended December 31, 2023 |
Assets |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  |  |
Operating |  | Current assets |  | $ | — |  |  | $ | — |
Finance |  | Current assets |  |  | 1 |  |  |  | 1 |
Long-term |  |  |  |  |  |  |  |  |  |
Operating |  | Long-term assets |  |  | 2,200 |  |  |  | 2,262 |
Finance |  | Long-term assets |  |  | 37 |  |  |  | 43 |
Total right-of-use assets |  |  |  | $ | 2,238 |  |  | $ | 2,306 |
Liabilities |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  |  |
Operating |  | Short-term lease liability |  | $ | 219 |  |  | $ | 222 |
Finance |  | Short-term lease liability |  |  | 6 |  |  |  | 6 |
Noncurrent |  |  |  |  |  |  |  |  |  |
Operating |  | Long-term lease liability |  |  | 2,057 |  |  |  | 2,111 |
Finance |  | Long-term lease liability |  |  | 90 |  |  |  | 94 |
Total lease liabilities |  |  |  | $ | 2,372 |  |  | $ | 2,433 |
| Finance and operating lease assets and lease liabilities are as follows:
Lease Classification |  | Classification |  | December 31, 2023 |  |  | December 31, 2022 |
Assets |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  |  |
Operating |  | Current assets |  | $ | — |  |  | $ | — |
Finance |  | Current assets |  |  | 1 |  |  |  | 1 |
Long-term |  |  |  |  |  |  |  |  |  |
Operating |  | Long-term assets |  |  | 2,262 |  |  |  | 2,454 |
Finance |  | Long-term assets |  |  | 43 |  |  |  | 96 |
Total right-of-use assets |  |  |  | $ | 2,306 |  |  | $ | 2,551 |
Liabilities |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  |  |
Operating |  | Short-term lease liability |  | $ | 222 |  |  | $ | 205 |
Finance |  | Short-term lease liability |  |  | 6 |  |  |  | 377 |
Noncurrent |  |  |  |  |  |  |  |  |  |
Operating |  | Long-term lease liability |  |  | 2,111 |  |  |  | 2,300 |
Finance |  | Long-term lease liability |  |  | 94 |  |  |  | 98 |
Total lease liabilities |  |  |  | $ | 2,433 |  |  | $ | 2,980 |
Schedule of Lease Expense | The components of lease expense were as follows:
|  | Three Months Ended |
|  | March 31, 2024 |  |  | March 31, 2023 |
Operating lease expense |  | $ | 109 |  |  | $ | 104 |
Finance lease expense |  |  |  |  |  |  |  |
Amortization on ROU assets |  |  | 9 |  |  |  | 35 |
Interest on lease liabilities |  |  | 1 |  |  |  | 11 |
Short-term lease expense |  |  | 15 |  |  |  | 15 |
Total lease expense |  | $ | 134 |  |  | $ | 165 |
| The components of lease expense were as follows:
|  | Year Ended |
|  | December 31, 2023 |  |  | December 31, 2022 |
Operating lease expense |  | $ | 440 |  |  | $ | 412 |
Finance lease expense |  |  |  |  |  |  |  |
Amortization on ROU assets |  |  | 55 |  |  |  | 192 |
Interest on lease liabilities |  |  | 14 |  |  |  | 59 |
Short-term lease expense |  |  | 61 |  |  |  | 86 |
Total lease expense |  | $ | 570 |  |  | $ | 749 |
Schedule of Other Information Related to Leases | Other information related to leases was as follows:
|  | Three Months Ended |
|  | March 31, 2024 |  |  | March 31, 2023 |
Weighted average remaining lease term (in years) |  |  |  |  |  |  |  |
Operating leases |  |  | 7.6 |  |  |  | 8.5 |
Finance leases |  |  | 1.7 |  |  |  | 2.7 |
Weighted average discount rate: |  |  |  |  |  |  |  |
Operating leases |  |  | 8.1 | % |  |  | 8.1 | %
Finance lease |  |  | 4.6 | % |  |  | 4.6 | %
|  | Three Months Ended |
|  | March 31, 2024 |  |  | March 31, 2023 |
Cash paid for amounts included in measurement of lease liabilities |  |  |  |  |  |  |  |
Operating cash flows from operating leases |  | $ | 104 |  |  | $ | 103 |
Operating cash flows from finance leases |  | $ | 2 |  |  | $ | 10 |
ROU assets obtained in exchange for lease obligations |  |  |  |  |  |  |  |
Operating leases |  | $ | — |  |  | $ | 72 |
Finance lease |  | $ | — |  |  | $ | — |
| Other information related to leases was as follows:
|  | Year Ended |
|  | December 31, 2023 |  |  | December 31, 2022 |
Weighted average remaining lease term (in years) |  |  |  |  |  |  |  |
Operating leases |  |  | 7.8 |  |  |  | 8.8 |
Finance leases |  |  | 1.9 |  |  |  | 0.8 |
Weighted average discount rate: |  |  |  |  |  |  |  |
Operating leases |  |  | 8.1 | % |  |  | 8.0 | %
Finance lease |  |  | 4.6 | % |  |  | 12.7 | %
|  | Year Ended |
|  | December 31, 2023 |  |  | December 31, 2022 |
Cash paid for amounts included in measurement of lease liabilities |  |  |  |  |  |  |  |
Operating cash flows from operating leases |  | $ | 423 |  |  | $ | 222 |
Operating cash flows from finance leases |  | $ | 16 |  |  | $ | 45 |
ROU assets obtained in exchange for lease obligations |  |  |  |  |  |  |  |
Operating leases |  | $ | 55 |  |  | $ | 1,375 |
Finance lease |  | $ | — |  |  | $ | 47 |
Schedule of Future Minimum Lease Payments Under Non-Cancellable Leases | Future minimum lease payments under non-cancellable leases as of March 31, 2024 were as follows:
Year |  | Operating Leases |  |  | Finance Leases |
2024 |  | $ | 297 |  |  | $ | 6 |
2025 |  |  | 371 |  |  |  | 32 |
2026 |  |  | 367 |  |  |  | 65 |
2027 |  |  | 412 |  |  |  | — |
2028 |  |  | 412 |  |  |  | — |
Thereafter |  |  | 1,220 |  |  |  | — |
Total future minimum lease payments |  |  | 3,079 |  |  |  | 103 |
Less: imputed interest |  |  | (803 | ) |  |  | (8 | )
Total |  |  | 2,276 |  |  |  | 95 |
Plus: lease asset, current |  |  | — |  |  |  | 1 |
Less: lease liability, current |  |  | (219 | ) |  |  | (6 | )
Total long-term lease liability |  | $ | 2,057 |  |  | $ | 90 |
| Future minimum lease payments under non-cancellable leases as of December 31, 2022 were as follows:
Year |  | Operating Leases |  |  | Finance Leases |
2024 |  | $ | 402 |  |  | $ | 10 |
2025 |  |  | 371 |  |  |  | 32 |
2026 |  |  | 367 |  |  |  | 65 |
2027 |  |  | 412 |  |  |  | — |
2028 |  |  | 412 |  |  |  | — |
Thereafter |  |  | 1,220 |  |  |  | — |
Total future minimum lease payments |  |  | 3,184 |  |  |  | 107 |
Less: imputed interest |  |  | (851 | ) |  |  | (8 | )
Total |  |  | 2,333 |  |  |  | 99 |
Plus: lease asset, current |  |  | — |  |  |  | 1 |
Less: lease liability, current |  |  | (222 | ) |  |  | (6 | )
Total long-term lease liability |  | $ | 2,111 |  |  | $ | 94 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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