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Revenue - Schedule of Deferred Revenue Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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