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The Company and Summary of Significant Accounting Policies - Net revenues categorized by customer location (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
UNITED STATES        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers 389 1,968 5,056 4,379
CHINA        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers 80 $ 1,094 4,745 5,608
KOREA, REPUBLIC OF        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers 2,000   4,260 1,360
Germany        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers $ 796   1,422  
TAIWAN        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers     543 4,639
Other        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers     $ 2 25
SINGAPORE        
The Company and Summary of Significant Accounting Policies        
Revenues from contracts with customers       $ 658