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v3.19.3

Organization (Details) | Sep. 30, 2019 service_provider
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of trusted service providers (more than) | 8,000

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- Definition Trusted Service Providers + References No definition available. + Details
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Namespace Prefix: | alrm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration