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Balance Sheet Components - Prepaid expenses and other assets (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Balance Sheet Components |  |  |  |
IPO expenses |  | $ 1,643 |  |
Intellectual property rights |  | 761 |  | $ 861
Lease deposit | $ 413 | 554 |  | 555
Prepaid expenses |  | 433 |  | 799
Prepaid inventory |  | 279 |  | 1,310
Other receivables |  | 105 |  | 102
Assets recognized for costs incurred to fulfill a contract (*) | 13 | 12 | $ 12 | 39
Total |  | 3,787 |  | 3,666
Less: Non-current assets |  | (881) |  | (993)
Prepaid expenses and other current assets | $ 5,466 | $ 2,906 |  | $ 2,673

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