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BALANCE SHEET DETAILS - CURRENT ASSETS AND CURRENT LIABILITIES (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Summary of Inventories, Net | The following table shows the components of inventory (in thousands):
|  | March 31, 2024 |  |  | December 31, 2023 |
Raw materials |  | $ | 8,823 |  |  | $ | 5,022 |
Finished goods |  |  | 2,673 |  |  |  | 16 |
Total inventories |  |  | 11,496 |  |  |  | 5,038 |
Allowance for obsolete inventory |  |  | (55 | ) |  |  | (4 | )
Inventories, net |  | $ | 11,441 |  |  | $ | 5,034 |
| Inventories, net The following table shows the components of inventory (in thousands):
|  | December 31, 2023 |  |  | December 31, 2022 |
Raw materials |  | $ | 5,022 |  |  | $ | 3,377 |
Finished goods |  |  | 16 |  |  |  | 115 |
Total inventories |  |  | 5,038 |  |  |  | 3,492 |
Allowance for obsolete inventory |  |  | (4 | ) |  |  | (211 | )
Inventories, net |  |  | 5,034 |  |  |  | 3,281 |
Summary of Prepaid Expenses and Other Current Assets | Prepaid expenses and other current assets The following table shows the components of prepaid e xp enses and other current assets (in thousands):
|  | March 31, 2024 |  |  | December 31, 2023 |
Prepaid expenses: |  |  |  |  |  |  |  |
Deposits on inventory |  | $ | 1,437 |  |  | $ | 2,146 |
Prepaid income tax |  |  | 362 |  |  |  | 362 |
Prepaid insurance |  |  | 530 |  |  |  | 1,110 |
Prepaid rent |  |  | 399 |  |  |  | 372 |
Prepaid equipment |  |  | 331 |  |  |  | 331 |
Prepaid other |  |  | 172 |  |  |  | 214 |
Other current assets: |  |  |  |  |  |  |  |
Other |  | $ | — |  |  | $ | 18 |
Total |  | $ | 3,231 |  |  | $ | 4,553 |
| Prepaid expenses and other current assets The following table shows the components of prepaid expenses and other current assets (in thousands):
|  | December 31, 2023 |  |  | December 31, 2022 |
Prepaid expenses: |  |  |  |  |  |  |  |
ERC benefits receivable |  | $ | — |  |  | $ | 2,117 |
Deposits on inventory |  |  | 2,146 |  |  |  | 680 |
Prepaid income tax |  |  | 362 |  |  |  | — |
Prepaid insurance |  |  | 1,110 |  |  |  | 358 |
Prepaid rent |  |  | 372 |  |  |  | 381 |
Prepaid equipment |  |  | 331 |  |  |  | 179 |
Prepaid other |  |  | 214 |  |  |  | 173 |
Other current assets: |  |  |  |  |  |  |  |
Interest rate swap asset |  | $ | — |  |  | $ | 476 |
Other |  |  | 18 |  |  |  | 17 |
Total |  | $ | 4,553 |  |  | $ | 4,381 |
Summary of Accrued Expenses and Other Current Liabilities | Accrued expenses and other current liabilities The following table shows the components of accrued expenses and other current liabilities (in thousands):
|  | March 31, 2024 |  |  | December 31, 2023 |
Accrued expenses: |  |  |  |  |  |  |  |
Accrued compensation and related benefits |  | $ | 3,878 |  |  | $ | 4,999 |
Accrued insurance |  |  | 435 |  |  |  | 978 |
Accrued transaction advisory fees |  |  | 1,000 |  |  |  | 1,000 |
Accrued professional services |  |  | 72 |  |  |  | 189 |
Accrued interest |  |  | 126 |  |  |  | 58 |
Accrued property taxes |  |  | 314 |  |  |  | 60 |
Accrued monitoring fees |  |  | 373 |  |  |  | 373 |
Other |  |  | 760 |  |  |  | 147 |
Other current liabilities: |  |  |  |  |  |  |  |
Income tax payable |  | $ | 1,757 |  |  | $ | 1,586 |
Sales tax payable |  |  | (413 | ) |  |  | 71 |
Unbilled lost-in-hole revenue |  |  | 96 |  |  |  | 76 |
Deferred revenue |  |  | 44 |  |  |  | 1,042 |
Total accrued expenses and other current liabilities |  | $ | 8,442 |  |  | $ | 10,579 |
| Accrued expenses and other current liabilities The following table shows the components of accrued expenses and other current liabilities (in thousands):
|  | December 31, 2023 |  |  | December 31, 2022 |
Accrued expenses: |  |  |  |  |  |  |  |
Accrued compensation and related benefits |  | $ | 4,999 |  |  | $ | 3,392 |
Accrued insurance |  |  | 978 |  |  |  | 525 |
Accrued transaction advisory fees |  |  | 1,000 |  |  |  | — |
Accrued professional services |  |  | 189 |  |  |  | 509 |
Accrued interest |  |  | 58 |  |  |  | 62 |
Accrued property taxes |  |  | 60 |  |  |  | 41 |
Accrued monitoring fee |  |  | 373 |  |  |  |  |
Other |  |  | 147 |  |  |  | 38 |
Other current liabilities: |  |  |  |  |  |  |  |
Income tax payable |  | $ | 1,586 |  |  | $ | 1,780 |
Sales tax payable |  |  | 71 |  |  |  | 587 |
Unbilled lost-in-hole revenue |  |  | 76 |  |  |  | 282 |
Deferred revenue |  |  | 1,042 |  |  |  | 83 |
Total accrued expenses and other current liabilities |  | $ | 10,579 |  |  | $ | 7,299 |

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