Debt, Commitments and Contingencies - Legal Proceedings (Details) $ in Thousands									1 Months Ended		3 Months Ended								6 Months Ended	12 Months Ended
	Oct. 03, 2023 case	Mar. 08, 2023 patent	Jan. 04, 2023 patent	Jan. 10, 2022 patent	Jul. 28, 2021 patent	Jul. 22, 2021 patent	Feb. 25, 2021 patent	Jun. 02, 2015 patent	Jan. 31, 2021 claim patent	Oct. 31, 2019 patent	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Apr. 18, 2023 patent	Dec. 31, 2023 USD ($) patent	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2018 patent
Loss Contingencies [Line Items]
Total revenue | $											$ (226,237)	$ (221,854)	$ (223,875)	$ (209,716)	$ (208,139)	$ (216,138)	$ (212,845)	$ (205,437)		$ (881,682)	$ (842,559)	$ (748,969)
Net income | $											$ (31,171)	$ (19,351)	$ (15,611)	$ (14,207)	(17,790)	$ (18,110)	$ (10,828)	$ (8,903)		(80,340)	(55,631)	(51,175)
SaaS and license revenue
Loss Contingencies [Line Items]
Total revenue | $																				$ (569,200)	$ (520,377)	$ (460,372)
IOT Innovations LLC vs Monitronics International, Inc.
Loss Contingencies [Line Items]
Number of cases dismissed | case	3
Pending Litigation | SaaS and license revenue
Loss Contingencies [Line Items]
Total revenue | $															6,000
Net income | $															$ 6,000
Pending Litigation | Vivint, Inc. vs. Alarm.com Holdings, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed		14	15					6
Pending Litigation | EcoFactor, Inc. vs. Alarm.com Holdings, Inc.
Loss Contingencies [Line Items]
Number of patents allegedly infringed				5						2
Number of patents under ex parte reexamination																				3
Pending Litigation | Causam Enterprises, Inc vs Alarm.com Holdings, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed						4
Pending Litigation | Causam Enterprises, Inc vs Alarm.com Holdings, Inc and EnergyHub, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed					4
Pending Litigation | Vivint, Inc vs ADT LLC | Minimum
Loss Contingencies [Line Items]
Number of patents allegedly infringed							1
Pending Litigation | IOT Innovations LLC vs Monitronics International, Inc.
Loss Contingencies [Line Items]
Number of patents allegedly infringed																			26
Pending Litigation | Ubiquitous Connectivity, LP vs. Alarm.com Holdings, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed									4														2
Number of claims deemed unpatentable | claim									42
Number of claims | claim									46