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Debt, Commitments and Contingencies - Carrying Amount of Equity Component (Details) - Convertible Senior Notes due 2026 - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Debt Instrument [Line Items] |  |
Debt discount for conversion option | $ 77,199 | $ 0
Debt issuance costs | (2,424) | 0
Net carrying amount | $ 74,775 | $ 0

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- Definition Debt Instrument, Unamortized Discount, Equity Component Conversion Option + References No definition available. + Details
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Namespace Prefix: | alrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Debt Issuance Costs, Gross, Equity Component + References No definition available. + Details
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Namespace Prefix: | alrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 + Details
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- Definition 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. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |