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The Company and Summary of Significant Accounting Policies - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Revenue and Deferred Revenue    
Total revenue, net $ 12,797 $ 5,631
ASRs    
Revenue and Deferred Revenue    
Total revenue, net 4,189 4,202
ECD    
Revenue and Deferred Revenue    
Total revenue, net 8,608 1,429
Point in time    
Revenue and Deferred Revenue    
Total revenue, net 8,483 1,447
Point in time | ASRs    
Revenue and Deferred Revenue    
Total revenue, net 153 77
Point in time | ECD    
Revenue and Deferred Revenue    
Total revenue, net 8,330 1,370
Transferred over time    
Revenue and Deferred Revenue    
Total revenue, net 4,314 4,184
Transferred over time | ASRs    
Revenue and Deferred Revenue    
Total revenue, net 4,036 4,125
Transferred over time | ECD    
Revenue and Deferred Revenue    
Total revenue, net $ 278 $ 59