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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