Segment Information - Schedule of Reportable Segment Operational Data (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [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
Operating income / (loss)									66,829	51,037	61,572
Assets	1,439,563				1,329,375				1,439,563	1,329,375
Operating Segments | Alarm.com
Segment Reporting Information [Line Items]
Total revenue									824,451	796,071	711,544
Operating income / (loss)									74,562	66,744	70,646
Assets	1,477,674				1,366,343				1,477,674	1,366,343
Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue									61,028	51,340	42,824
Operating income / (loss)									(12,168)	(16,255)	(9,590)
Assets	73,621				53,927				73,621	53,927
Intersegment Eliminations | Alarm.com
Segment Reporting Information [Line Items]
Total revenue									(3,201)	(4,067)	(3,089)
Operating income / (loss)									4,017	417	766
Assets	(111,725)				(90,929)				(111,725)	(90,929)
Intersegment Eliminations | Other
Segment Reporting Information [Line Items]
Total revenue									(596)	(785)	(2,310)
Operating income / (loss)									418	131	(250)
Assets	$ (7)				$ 34				(7)	34
SaaS and license revenue
Segment Reporting Information [Line Items]
Total revenue									569,200	520,377	460,372
SaaS and license revenue | Operating Segments | Alarm.com
Segment Reporting Information [Line Items]
Total revenue									514,673	478,134	426,823
SaaS and license revenue | Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue									54,527	42,243	33,549
SaaS and license revenue | Intersegment Eliminations | Alarm.com
Segment Reporting Information [Line Items]
Total revenue									0	0	0
SaaS and license revenue | Intersegment Eliminations | Other
Segment Reporting Information [Line Items]
Total revenue									0	0	0
Hardware and other revenue
Segment Reporting Information [Line Items]
Total revenue									312,482	322,182	288,597
Hardware and other revenue | Operating Segments | Alarm.com
Segment Reporting Information [Line Items]
Total revenue									309,778	317,937	284,721
Hardware and other revenue | Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue									6,501	9,097	9,275
Hardware and other revenue | Intersegment Eliminations | Alarm.com
Segment Reporting Information [Line Items]
Total revenue									(3,201)	(4,067)	(3,089)
Hardware and other revenue | Intersegment Eliminations | Other
Segment Reporting Information [Line Items]
Total revenue									$ (596)	$ (785)	$ (2,310)