Debt, Commitments and Contingencies - Legal Proceedings (Details) - Pending Litigation										1 Months Ended
	Feb. 25, 2021 patent	May 26, 2020 patent	Nov. 11, 2019 patent	Oct. 22, 2019 patent	Jul. 24, 2019 patent	Nov. 05, 2018 claim	Jun. 26, 2017 patent	Aug. 19, 2016 patent	Jun. 02, 2015 patent	Sep. 30, 2017 patent	May 31, 2017 patent	Mar. 31, 2017 patent
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 found to be unpatentable | claim						9
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		4	3	3
Vivint, Inc vs ADT LLC | Minimum
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company	1
Vivint, Inc vs ADT LLC | Maximum
Loss Contingencies [Line Items]
Number of patents allegedly infringed upon by the company	6