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Other Assets - Amortized Cost (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Amortized cost of nonaccrual notes receivable | $ 0 | $ 9
Loan Receivables |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Amortized cost of nonaccrual notes receivable | 0 | 0
Hardware Financing Receivables |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Amortized cost of nonaccrual notes receivable | $ 0 | $ 9

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- Definition Financing Receivable, Amortized Cost, Nonaccrual + 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 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_FinanceReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |