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Revenue - Schedule of Sales Commissions Contract Assets (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Sales commissions contract assets beginning balance $ 152
Additions during the period 27
Amortization of sales commissions contract assets (27)
Sales commissions contract assets ending balance 152
HW [Member]  
Sales commissions contract assets beginning balance 125
Additions during the period 23
Amortization of sales commissions contract assets (25)
Sales commissions contract assets ending balance 123
Monitoring [Member]  
Sales commissions contract assets beginning balance 2
Additions during the period 4
Amortization of sales commissions contract assets (2)
Sales commissions contract assets ending balance $ 29