Revenue - Schedule of Sales Commissions Contract Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Sales commissions contract assets beginning balance	$ 143
Additions during the period	21
Amortization of sales commissions	(25)
Sales commissions contract assets ending balance	139
HW [Member]
Sales commissions contract assets beginning balance	107
Additions during the period	16
Amortization of sales commissions	(22)
Sales commissions contract assets ending balance	101
Monitoring [Member]
Sales commissions contract assets beginning balance	36
Additions during the period	5
Amortization of sales commissions	(3)
Sales commissions contract assets ending balance	$ 38