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The Company and Summary of Significant Accounting Policies - Inventory (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Organization and Liquidity        
Inventory written down $ 0 $ 0 $ 358,000 $ 338,000