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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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