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Revenue - Schedule of Deferred Revenue Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Deferred revenue beginning balance | $ 4,061 | $ 3,564
Additions during the period | 5,728 | 5,378
Recognized as revenue | (5,294) | (4,881)
Deferred revenue ending balance | 4,495 | 4,061
December 31, 2020 [Member] |  |
Recognized as revenue | 2,732 |
December 31, 2021 [Member] |  |
Recognized as revenue | 975 |
December 31, 2022 and Thereafter [Member] |  |
Recognized as revenue | 354 |
December 31, 2018 [Member] |  |
Recognized as revenue |  | 2,732
December 31, 2019 [Member] |  |
Recognized as revenue |  | 975
December 31, 2020 and Thereafter [Member] |  |
Recognized as revenue |  | 354
Hardware [Member] |  |
Deferred revenue beginning balance | 2,432 | 2,227
Additions during the period | 2,199 | 2,374
Recognized as revenue | (1,968) | (2,169)
Deferred revenue ending balance | 2,663 | 2,432
Hardware [Member] | December 31, 2020 [Member] |  |
Recognized as revenue | 1,350 |
Hardware [Member] | December 31, 2021 [Member] |  |
Recognized as revenue | 990 |
Hardware [Member] | December 31, 2022 and Thereafter [Member] |  |
Recognized as revenue | 323 |
Hardware [Member] | December 31, 2018 [Member] |  |
Recognized as revenue |  | 1,353
Hardware [Member] | December 31, 2019 [Member] |  |
Recognized as revenue |  | 731
Hardware [Member] | December 31, 2020 and Thereafter [Member] |  |
Recognized as revenue |  | 348
Monitoring [Member] |  |
Deferred revenue beginning balance | 1,629 | 1,337
Additions during the period | 3,529 | 3,004
Recognized as revenue | (3,326) | (2,712)
Deferred revenue ending balance | 1,832 | 1,629
Monitoring [Member] | December 31, 2020 [Member] |  |
Recognized as revenue | 1,654 |
Monitoring [Member] | December 31, 2021 [Member] |  |
Recognized as revenue | 174 |
Monitoring [Member] | December 31, 2022 and Thereafter [Member] |  |
Recognized as revenue | $ 4 |
Monitoring [Member] | December 31, 2018 [Member] |  |
Recognized as revenue |  | 1,379
Monitoring [Member] | December 31, 2019 [Member] |  |
Recognized as revenue |  | 244
Monitoring [Member] | December 31, 2020 and Thereafter [Member] |  |
Recognized as revenue |  | $ 6

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