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BALANCE SHEET DETAILS - CURRENT ASSETS AND CURRENT LIABILITIES - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Accrued expenses: |  |  |
Accrued compensation and related benefits | $ 3,878 | $ 4,999 | $ 3,392
Accrued insurance | 435 | 978 | 525
Accrued transaction advisory fees | 1,000 | 1,000 | 0
Accrued professional services | 72 | 189 | 509
Accrued interest | 126 | 58 | 62
Accrued property taxes | 314 | 60 | 41
Accrued monitoring fees | 373 | 373 |
Other | 760 | 147 | 38
Other current liabilities: |  |  |
Income tax payable | 1,757 | 1,586 | 1,780
Sales tax payable | (413) | 71 | 587
Unbilled lost-in-hole revenue | 96 | 76 | 282
Deferred revenue | 44 | 1,042 | 83
Total accrued expenses and other current liabilities | $ 8,442 | $ 10,579 | $ 7,299

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