Revenue - Schedule of Deferred Revenue Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Deferred revenue beginning balance	$ 4,061
Additions during the period	1,230
Recognized as revenue	(1,240)
Deferred revenue ending balance	4,051
March 31, 2020 [Member]
Recognized as revenue	2,679
March 31, 2021 [Member]
Recognized as revenue	1,060
March 31, 2022 and Thereafter [Member]
Recognized as revenue	312
HW [Member]
Deferred revenue beginning balance	2,432
Additions during the period	417
Recognized as revenue	(474)
Deferred revenue ending balance	2,375
HW [Member] | March 31, 2020 [Member]
Recognized as revenue	1,229
HW [Member] | March 31, 2021 [Member]
Recognized as revenue	842
HW [Member] | March 31, 2022 and Thereafter [Member]
Recognized as revenue	304
Monitoring [Member]
Deferred revenue beginning balance	1,629
Additions during the period	813
Recognized as revenue	(766)
Deferred revenue ending balance	1,676
Monitoring [Member] | March 31, 2020 [Member]
Recognized as revenue	1,450
Monitoring [Member] | March 31, 2021 [Member]
Recognized as revenue	218
Monitoring [Member] | March 31, 2022 and Thereafter [Member]
Recognized as revenue	$ 8