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Revenue - Schedule of Sales Commissions Contract Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sales commissions contract assets beginning balance $ 138 $ 143
Additions during the period 129 87
Amortization of sales commissions (90) (92)
Sales commissions contract assets ending balance 177 138
Hardware [Member]    
Sales commissions contract assets beginning balance 101 107
Additions during the period 106 69
Amortization of sales commissions (71) (75)
Sales commissions contract assets ending balance 136 101
Monitoring [Member]    
Sales commissions contract assets beginning balance 37 36
Additions during the period 23 18
Amortization of sales commissions (19) (17)
Sales commissions contract assets ending balance $ 41 $ 37