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