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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2022	Mar. 31, 2020	Mar. 09, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Accrued interest receivable	$ 2,100,000
Asset impairment	0	$ 0	$ 1,100,000
Goodwill, impairment loss	0	0	0
Impairment of intangible assets	$ 0	0	0
Product warranty, term	25 years
Advertising costs	$ 16,200,000	800,000	$ 600,000
Additional paid in capital	(837,924,000)	(534,744,000)
Accumulated deficit	$ 405,737,000	$ 51,186,000
Cumulative Effect, Period of Adoption, Adjustment | Forecast | Accounting Standards Update 2020-06
Fair Value, Option, Quantitative Disclosures [Line Items]
Additional paid in capital				$ 207,900,000
Convertible debt				244,500,000
Deferred income tax liabilities				62,300,000
Accumulated deficit				$ 25,700,000
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
Convertible Senior Notes Due 2025 | Convertible Notes
Fair Value, Option, Quantitative Disclosures [Line Items]
Debt instrument face amount					$ 320,000,000	$ 320,000,000
Interest rate					0.25%	0.25%
Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Property, plant and equipment, useful life	3 years
Intangible assets, estimated useful life	5 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
Period failure rate measurement lags product sale	9 months
Maximum | Communication Accessories
Fair Value, Option, Quantitative Disclosures [Line Items]
Service period	12 years

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