Segment Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Total revenue	$ 233,807,000	$ 223,875,000	$ 457,090,000	$ 433,591,000
Operating income / (loss)	25,774,000	16,159,000	44,499,000	24,978,000
Total assets	1,855,247,000		1,855,247,000		$ 1,439,563,000
Amortization and depreciation	7,080,000	7,860,000	14,417,000	15,533,000
Operating Segments | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	218,319,000	210,387,000	428,540,000	409,534,000
Operating income / (loss)	30,690,000	19,901,000	54,261,000	33,831,000
Total assets	1,907,486,000		1,907,486,000		1,477,674,000
Amortization and depreciation	6,800,000	7,600,000	13,900,000	15,000,000.0
Additions to property and equipment	1,900,000	2,800,000	5,800,000	5,800,000
Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue	16,536,000	14,538,000	30,420,000	25,999,000
Operating income / (loss)	(4,851,000)	(3,878,000)	(9,593,000)	(9,068,000)
Total assets	55,017,000		55,017,000		73,621,000
Amortization and depreciation	300,000	300,000	500,000	600,000
Additions to property and equipment	100,000	100,000	100,000	100,000
Intersegment Eliminations | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	(860,000)	(881,000)	(1,545,000)	(1,658,000)
Operating income / (loss)	(89,000)	41,000	(222,000)	46,000
Total assets	(107,239,000)		(107,239,000)		(111,725,000)
Intersegment Eliminations | Other
Segment Reporting Information [Line Items]
Total revenue	(188,000)	(169,000)	(325,000)	(284,000)
Operating income / (loss)	24,000	$ 95,000	53,000	$ 169,000
Total assets	$ (17,000)		$ (17,000)		$ (7,000)
Segment Concentration Risk | Revenue | Alarm.com
Segment Reporting Information [Line Items]
Concentration risk percentage	93.00%	94.00%	93.00%	94.00%
SaaS and license revenue
Segment Reporting Information [Line Items]
Total revenue	$ 155,927,000	$ 140,432,000	$ 306,271,000	$ 275,826,000
SaaS and license revenue | Operating Segments | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	140,854,000	127,754,000	278,713,000	253,406,000
SaaS and license revenue | Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue	15,073,000	12,678,000	27,558,000	22,420,000
SaaS and license revenue | Intersegment Eliminations | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
SaaS and license revenue | Intersegment Eliminations | Other
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Hardware and other revenue
Segment Reporting Information [Line Items]
Total revenue	77,880,000	83,443,000	150,819,000	157,765,000
Hardware and other revenue | Operating Segments | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	77,465,000	82,633,000	149,827,000	156,128,000
Hardware and other revenue | Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue	1,463,000	1,860,000	2,862,000	3,579,000
Hardware and other revenue | Intersegment Eliminations | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	(860,000)	(881,000)	(1,545,000)	(1,658,000)
Hardware and other revenue | Intersegment Eliminations | Other
Segment Reporting Information [Line Items]
Total revenue	(188,000)	(169,000)	(325,000)	(284,000)
Software License Revenue | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	5,200,000	5,900,000	10,400,000	12,100,000
Software License Revenue | Other
Segment Reporting Information [Line Items]
Total revenue	$ 0	$ 0	$ 0	$ 0