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BALANCE SHEET DETAILS - CURRENT ASSETS AND CURRENT LIABILITIES - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Prepaid expenses: |  |  |
ERC benefits receivable |  | $ 0 | $ 2,117
Deposits on inventory | $ 1,437 | 2,146 | 680
Prepaid income tax | 362 | 362 | 0
Prepaid insurance | 530 | 1,110 | 358
Prepaid rent | 399 | 372 | 381
Prepaid equipment | 331 | 331 | 179
Prepaid other | 172 | 214 | 173
Other current assets: |  |  |
Interest rate swap asset |  | 0 | 476
Other | 0 | 18 | 17
Total | $ 3,231 | $ 4,553 | $ 4,381

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