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Balance Sheet Components - Prepaid expenses and other assets (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Balance Sheet Components |  |  |
Prepaid expenses | $ 3,345 | $ 433 |
Prepaid inventory | 1,429 | 279 |
Lease deposit | 413 | 554 | $ 555
Other receivables and current assets | 279 | 117 |
IPO expenses |  | (1,643) |
Prepaid expenses and other current assets | $ 5,466 | $ 2,906 | $ 2,673

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