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Revenue - Schedule of Deferred Revenue Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deferred revenue beginning balance	$ 4,495	$ 4,061
Additions during the period	5,567	5,728
Recognized as revenue	(5,508)	(5,294)
Deferred revenue ending balance	4,554	4,495
December 31, 2021 [Member]
Recognized as revenue	3,214	2,732
December 31, 2022 [Member]
Recognized as revenue	1,072	975
December 31, 2023 and Thereafter [Member]
Recognized as revenue	268	354
Hardware [Member]
Deferred revenue beginning balance	2,663	2,432
Additions during the period	1,602	2,199
Recognized as revenue	(1,689)	(1,968)
Deferred revenue ending balance	2,576	2,663
Hardware [Member] | December 31, 2021 [Member]
Recognized as revenue	1,471	1,350
Hardware [Member] | December 31, 2022 [Member]
Recognized as revenue	846	990
Hardware [Member] | December 31, 2023 and Thereafter [Member]
Recognized as revenue	259	323
Monitoring [Member]
Deferred revenue beginning balance	1,832	1,629
Additions during the period	3,965	3,529
Recognized as revenue	(3,819)	(3,326)
Deferred revenue ending balance	1,978	1,832
Monitoring [Member] | December 31, 2021 [Member]
Recognized as revenue	1,743	1,654
Monitoring [Member] | December 31, 2022 [Member]
Recognized as revenue	226	174
Monitoring [Member] | December 31, 2023 and Thereafter [Member]
Recognized as revenue	$ 9	$ 4

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 8
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-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

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-Publisher FASB
-Name Accounting Standards Codification
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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