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The Company and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers $ 3,265 $ 3,062 $ 16,028 $ 16,669
At a point in time        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers 2,378 599 10,968 12,977
Over time        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers 887 2,463 5,060 3,692
Product Revenues        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers 2,378 599 10,968 12,977
Product Revenues | At a point in time        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers 2,378 599 10,968 12,977
Service Revenues        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers 887 2,463 5,060 3,692
Service Revenues | Over time        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers $ 887 $ 2,463 $ 5,060 $ 3,692