XML 66 R56.htm IDEA: XBRL DOCUMENT
v3.23.1

Other Assets - Investments in a Technology Partner (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2022 | Feb. 28, 2021 | Mar. 31, 2023 | Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cash purchase of shares |  |  | $ 200 | $ 0
Technology Partner |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cash purchase of shares |  | $ 5,000 |  |
Investment | $ 5,700 |  | 5,700 |
Technology Partner | Series B-2 Preferred Stock |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Shares purchased (in shares) |  | 1,000,000 |  |
Technology Partner Three |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Cash purchase of shares | 5,100 |  |  |
Investment | $ 5,100 |  | $ 5,100 |
Technology Partner Three | Series A Preferred Stock |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Shares purchased (in shares) | 4,231,717 |  |  |

X
- Definition Equity Securities Without Readily Determinable Fair Value, Shares Acquired + References No definition available. + Details
Name: | alrm_EquitySecuritiesWithoutReadilyDeterminableFairValueSharesAcquired
Namespace Prefix: | alrm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow from the amount invested for projects in hopes of getting a future return or interest from it. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireProjects
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=alrm_TechnologyPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=alrm_SeriesB2PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=alrm_TechnologyPartnerThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |