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Product Warranty Term

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Revenue From Contract With Customer, Service Period

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount of noncurrent assets classified as other.

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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]
Restricted cash	$ 44,700,000	$ 0	$ 0
Asset impairment	1,100,000	1,600,000	800,000
Goodwill, impairment loss	0	0	0
Impairment of intangible assets	0	0	$ 0
Operating lease, right of use asset	10,117,000
Other liabilities	11,817,000	3,250,000
Accrued liabilities	47,092,000	29,010,000
Other assets	$ 44,620,000	$ 36,548,000
Monitoring Hardware And Service
Fair Value, Option, Quantitative Disclosures [Line Items]
Capitalized contract cost, amortization period	6 years
First and Second Generation
Fair Value, Option, Quantitative Disclosures [Line Items]
Product warranty, term	15 years
Third and Fourth Generation
Fair Value, Option, Quantitative Disclosures [Line Items]
Product warranty, term	25 years
Envoy Communications Gateway
Fair Value, Option, Quantitative Disclosures [Line Items]
Product warranty, term	5 years
AC Battery Storage Solution
Fair Value, Option, Quantitative Disclosures [Line Items]
Product warranty, term	10 years
Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Property, plant and equipment, useful life	3 years
Intangible assets, estimated useful life	3 years
Period failure rate measurement lags product sale	3 months
Minimum \| Communication Accessories
Fair Value, Option, Quantitative Disclosures [Line Items]
Service period	5 years
Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Property, plant and equipment, useful life	10 years
Intangible assets, estimated useful life	9 years
Product warranty, term	25 years
Period failure rate measurement lags product sale	9 months
Maximum \| Communication Accessories
Fair Value, Option, Quantitative Disclosures [Line Items]
Service period	12 years
Accounting Standards Update 2016-02
Fair Value, Option, Quantitative Disclosures [Line Items]
Operating lease, right of use asset				$ 8,400,000
Other liabilities				6,800,000
Accrued liabilities				1,500,000
Other assets				$ (100,000)