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Revenue and Deferred Revenue - Disaggregation of Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue and Deferred Revenue        
Total revenue, net $ 3,131 $ 2,535 $ 8,797 $ 7,992
Autonomous Security Robots        
Revenue and Deferred Revenue        
Total revenue, net 1,050 1,143 3,378 3,145
Emergency Communication Devices        
Revenue and Deferred Revenue        
Total revenue, net 2,081 1,392 5,419 4,847
Point in time        
Revenue and Deferred Revenue        
Total revenue, net 1,854 1,211 4,737 4,412
Point in time | Autonomous Security Robots        
Revenue and Deferred Revenue        
Total revenue, net 6 20 26 67
Point in time | Emergency Communication Devices        
Revenue and Deferred Revenue        
Total revenue, net 1,848 1,191 4,711 4,345
Transferred over time        
Revenue and Deferred Revenue        
Total revenue, net 1,277 1,324 4,060 3,580
Transferred over time | Autonomous Security Robots        
Revenue and Deferred Revenue        
Total revenue, net 1,044 1,123 3,352 3,078
Transferred over time | Emergency Communication Devices        
Revenue and Deferred Revenue        
Total revenue, net $ 233 $ 201 $ 708 $ 502