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Debt, Commitments and Contingencies - Legal Proceedings (Details) $ in Millions									1 Months Ended			3 Months Ended	9 Months Ended
	Oct. 22, 2019 patent	Sep. 30, 2019 USD ($)	Jul. 24, 2019 patent	Jan. 02, 2019 USD ($)	Jun. 26, 2017 patent	Apr. 25, 2017 claim	Aug. 19, 2016 patent	Jun. 02, 2015 patent	Sep. 30, 2017 patent	May 31, 2017 patent	Mar. 31, 2017 patent	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Pending Litigation | Alarm.com and ICN Acquisition, LLC vs. Protect America,Inc. and SecureNet Technologies, LLC
Loss Contingencies [Line Items]
Number of company's patents allegedly infringed | claim						1
Pending Litigation | Vivint, Inc. vs. Alarm.com Holdings, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company			2		4		5	6		3	2
Number of patents under reexamination									2
Number of patents allegedly infringed by elements in solution								1
Settled Litigation | Alarm.com vs. U.S. District Court For The Northern District Of California, Payment
Loss Contingencies [Line Items]
Loss contingency, payments | $		$ 23.0		$ 5.0
General and administrative | Settled Litigation | Alarm.com vs. U.S. District Court for the Northern District of California
Loss Contingencies [Line Items]
Loss contingency, settlement | $												$ 28.0	$ 28.0
Subsequent Event | Pending Litigation | EcoFactor, Inc. vs. Alarm.com Holdings, Inc.
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company	4

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