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Revenue and Deferred Revenue - Revenue by product line and timing of recognition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenue and Deferred Revenue    
Revenue, net $ 2,897 $ 944
ASRs    
Revenue and Deferred Revenue    
Revenue, net 1,022 944
Blue light Towers, ephones and Call Boxes    
Revenue and Deferred Revenue    
Revenue, net 1,875  
Point in time    
Revenue and Deferred Revenue    
Revenue, net 1,807 15
Point in time | ASRs    
Revenue and Deferred Revenue    
Revenue, net 20 15
Point in time | Blue light Towers, ephones and Call Boxes    
Revenue and Deferred Revenue    
Revenue, net 1,787  
Transferred over time    
Revenue and Deferred Revenue    
Revenue, net 1,090 929
Transferred over time | ASRs    
Revenue and Deferred Revenue    
Revenue, net 1,002 $ 929
Transferred over time | Blue light Towers, ephones and Call Boxes    
Revenue and Deferred Revenue    
Revenue, net $ 88