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Revenue - Schedule of Sales Commissions Contract Assets (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
Sales commissions contract assets beginning balance $ 143
Additions during the period 67
Amortization of sales commissions (72)
Sales commissions contract assets ending balance 138
Hardware [Member]  
Sales commissions contract assets beginning balance 107
Additions during the period 53
Amortization of sales commissions (60)
Sales commissions contract assets ending balance 100
Monitoring [Member]  
Sales commissions contract assets beginning balance 36
Additions during the period 14
Amortization of sales commissions (12)
Sales commissions contract assets ending balance $ 38