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Revenue - Schedule of Sales Commissions Contract Assets (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
Sales commissions contract assets beginning balance $ 152
Additions during the period 82
Amortization of sales commissions (76)
Sales commissions contract assets ending balance 158
HW [Member]  
Sales commissions contract assets beginning balance 125
Additions during the period 67
Amortization of sales commissions (69)
Sales commissions contract assets ending balance 123
Monitoring [Member]  
Sales commissions contract assets beginning balance 27
Additions during the period 15
Amortization of sales commissions (7)
Sales commissions contract assets ending balance $ 35