The Company and Summary of Significant Accounting Policies - Autonomous Security Robots, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Research and development expense
Autonomous Security Robots, net
Depreciation expense of finished ASRs	$ 8	$ 66
Sales and marketing expense
Autonomous Security Robots, net
Depreciation expense of finished ASRs	15	46
Cost of revenue, net
Autonomous Security Robots, net
Depreciation expense of finished ASRs	$ 1,600	$ 1,400
Maximum
Autonomous Security Robots, net
Estimated expected lives	5 years
Autonomous Security Robots, net | Minimum
Autonomous Security Robots, net
Estimated expected lives	3 years