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The Company and Summary of Significant Accounting Policies - Warranty (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
changes in provisions for product warranties    
Beginning balance $ 64,000 $ 106,000
Provision 18,000  
Adjustment to prior provisions (27,000) (42,000)
Ending balance $ 55,000 $ 64,000