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The Company and Summary of Significant Accounting Policies - Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
The Company and Summary of Significant Accounting Policies    
Prepaid inventory $ 123 $ 66
Prepaid expense 488 901
Other receivables 362  
Research and development tax credit 376 376
Other current assets 72 6
Total $ 1,421 $ 1,349