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Revenue - Schedule of Deferred Revenue Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred revenue beginning balance	$ 3,564	$ 2,778
Additions during the period	5,378	4,959
Recognized as revenue	(4,881)	(4,173)
Deferred revenue ending balance	4,061	3,564
December 31, 2019 [Member]
Recognized as revenue	2,732	805
December 31, 2020 [Member]
Recognized as revenue	975	6
December 31, 2021 and Thereafter [Member]
Recognized as revenue	354
December 31, 2018 [Member]
Recognized as revenue		2,753
HW [Member]
Deferred revenue beginning balance	2,227	1,655
Additions during the period	2,374	2,512
Recognized as revenue	(2,169)	(1,940)
Deferred revenue ending balance	2,432	2,227
HW [Member] | December 31, 2019 [Member]
Recognized as revenue	1,353	624
HW [Member] | December 31, 2020 [Member]
Recognized as revenue	731
HW [Member] | December 31, 2021 and Thereafter [Member]
Recognized as revenue	348
HW [Member] | December 31, 2018 [Member]
Recognized as revenue		1,603
Monitoring [Member]
Deferred revenue beginning balance	1,337	1,123
Additions during the period	3,004	2,447
Recognized as revenue	(2,712)	(2,233)
Deferred revenue ending balance	1,629	1,337
Monitoring [Member] | December 31, 2019 [Member]
Recognized as revenue	1,379	181
Monitoring [Member] | December 31, 2020 [Member]
Recognized as revenue	244	6
Monitoring [Member] | December 31, 2021 and Thereafter [Member]
Recognized as revenue	$ 6
Monitoring [Member] | December 31, 2018 [Member]
Recognized as revenue		$ 1,150

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

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