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Revenue - Schedule of Sales Commissions Contract Assets (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
Sales commissions contract assets beginning balance $ 152
Additions during the period 54
Amortization of sales commissions (52)
Sales commissions contract assets ending balance 154
HW [Member]  
Sales commissions contract assets beginning balance 125
Additions during the period 45
Amortization of sales commissions (47)
Sales commissions contract assets ending balance 123
Monitoring [Member]  
Sales commissions contract assets beginning balance 27
Additions during the period 9
Amortization of sales commissions (5)
Sales commissions contract assets ending balance $ 31