Loss Contingency, Patents Allegedly Infringed, Number Of Patents Found Unpatentable

No definition available.

Name:	alrm_LossContingencyPatentsAllegedlyInfringedNumberOfPatentsFoundUnpatentable
Namespace Prefix:	alrm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingency, Patents Allegedly Infringed, Number of Patents Allegedly Infringed by Elements in Solution

+ References

No definition available.

+ Details

Name:	alrm_LossContingencyPatentsAllegedlyInfringedNumberofPatentsAllegedlyInfringedbyElementsinSolution
Namespace Prefix:	alrm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingency, Patents Under Inter Partes Review, Decision Pending, Number

+ References

No definition available.

+ Details

Name:	alrm_LossContingencyPatentsUnderInterPartesReviewDecisionPendingNumber
Namespace Prefix:	alrm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingency, Patents Under Inter Partes Review, Number

+ References

No definition available.

+ Details

Name:	alrm_LossContingencyPatentsUnderInterPartesReviewNumber
Namespace Prefix:	alrm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingency, Patents Under Reexamination Ex Parte, Number

+ References

No definition available.

+ Details

Name:	alrm_LossContingencyPatentsUnderReexaminationExParteNumber
Namespace Prefix:	alrm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Loss Contingency, Patents Under Reexamination, Number

+ References

No definition available.

+ Details

Name:	alrm_LossContingencyPatentsUnderReexaminationNumber
Namespace Prefix:	alrm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of another entity's patents that the entity has allegedly infringed.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=alrm_VivintInc.vs.Alarm.comHoldingsInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=alrm_EcoFactorInc.vs.Alarm.comHoldingsInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=alrm_CausamEnterprisesIncVsAlarmcomHoldingsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=alrm_CausamEnterprisesIncVsAlarmcomHoldingsIncAndEnergyHubIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=alrm_VivintIncVsADTLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt, Commitments and Contingencies - Legal Proceedings (Details) - Pending Litigation - patent							1 Months Ended	6 Months Ended	12 Months Ended
	Mar. 22, 2022	Jan. 10, 2022	Jul. 28, 2021	Jul. 22, 2021	Feb. 25, 2021	Jun. 02, 2015	Oct. 31, 2019	Jun. 30, 2022	Dec. 31, 2019
Vivint, Inc. vs. Alarm.com Holdings, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company						6
Number of patents found to be unpatentable									5
Number of patents allegedly infringed by elements in solution						1
EcoFactor, Inc. vs. Alarm.com Holdings, Inc.
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company		5					2
Number of patents under ex parte reexamination								2
Number of patents under reexamination								3
Causam Enterprises, Inc vs Alarm.com Holdings, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company				4
Causam Enterprises, Inc vs Alarm.com Holdings, Inc and EnergyHub, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company			4
Vivint, Inc vs ADT LLC
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company	5
Patents under inter partes review	2
Patents pending a decision after review	3
Vivint, Inc vs ADT LLC \| Minimum
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company					1