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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