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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, 2023
Mar. 31, 2022
Research and development expense    
Autonomous Security Robots, net    
Depreciation expense of finished ASRs $ 2 $ 20
Sales and marketing expense    
Autonomous Security Robots, net    
Depreciation expense of finished ASRs 12 14
Cost of revenue, net    
Autonomous Security Robots, net    
Depreciation expense of finished ASRs $ 361 $ 307
Minimum    
Autonomous Security Robots, net    
Estimated expected lives 3 years 3 years
Maximum    
Autonomous Security Robots, net    
Estimated expected lives 5 years 5 years