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v3.26.1

Accounts Receivable, Net - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 USD ($) portfolio_segment | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) portfolio_segment | Jun. 30, 2025 USD ($)
Receivables [Abstract] |  |  |  |
Reserve for product returns | $ | $ 600 | $ 700 | $ 987 | $ 1,111
Accounts receivable, number of portfolio segments | portfolio_segment | 2 |  | 2 |

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- Definition Accounts Receivable, Number Of Portfolio Segments + References No definition available. + Details
Name: | alrm_AccountsReceivableNumberOfPortfolioSegments
Namespace Prefix: | alrm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Contract With Customer, Provision For Product Returns + References No definition available. + Details
Name: | alrm_ContractWithCustomerProvisionForProductReturns
Namespace Prefix: | alrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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