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Revenue - Schedule of Deferred Revenue Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Deferred revenue beginning balance	$ 3,564
Additions during the period	1,243
Recognized as revenue	(1,209)
Deferred revenue ending balance	3,598
March 31 2019 [Member]
Recognized as revenue	2,758
March 31 2020 [Member]
Recognized as revenue	688
March 31 2021 and Thereafter [Member]
Recognized as revenue	152
HW [Member]
Deferred revenue beginning balance	2,227
Additions during the period	589
Recognized as revenue	(567)
Deferred revenue ending balance	2,249
HW [Member] | March 31 2019 [Member]
Recognized as revenue	1,565
HW [Member] | March 31 2020 [Member]
Recognized as revenue	539
HW [Member] | March 31 2021 and Thereafter [Member]
Recognized as revenue	145
Monitoring [Member]
Deferred revenue beginning balance	1,337
Additions during the period	654
Recognized as revenue	(642)
Deferred revenue ending balance	1,349
Monitoring [Member] | March 31 2019 [Member]
Recognized as revenue	1,193
Monitoring [Member] | March 31 2020 [Member]
Recognized as revenue	149
Monitoring [Member] | March 31 2021 [Member]
Recognized as revenue	$ 7

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- Definition

Additions during the period.

+ References

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X

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

No definition available.

+ Details

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X

- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

No definition available.

+ Details

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