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The Company and Summary of Significant Accounting Policies - Autonomous Security Robots, net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Autonomous Security Robots, net    
Service cost of revenue, net $ 400  
Research and development expense    
Autonomous Security Robots, net    
Depreciation expense of finished ASRs 1 $ 2
Sales and marketing expense    
Autonomous Security Robots, net    
Depreciation expense of finished ASRs 0 12
Cost of revenue, net    
Autonomous Security Robots, net    
Depreciation expense of finished ASRs $ 483 $ 361
Minimum    
Autonomous Security Robots, net    
Estimated expected lives 3 years  
Maximum    
Autonomous Security Robots, net    
Estimated expected lives 5 years  
Autonomous Security Robots, net    
Autonomous Security Robots, net    
Service cost of revenue, net $ 400