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Revenue - Schedule of Sales Commissions Contract Assets (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
Sales commissions contract assets beginning balance $ 143
Additions during the period 49
Amortization of sales commissions (50)
Sales commissions contract assets ending balance 142
HW [Member]  
Sales commissions contract assets beginning balance 107
Additions during the period 38
Amortization of sales commissions (42)
Sales commissions contract assets ending balance 103
Monitoring [Member]  
Sales commissions contract assets beginning balance 36
Additions during the period 11
Amortization of sales commissions (8)
Sales commissions contract assets ending balance $ 39