Goodwill and Intangible Assets, Net - Narrative (Details) - USD ($)				12 Months Ended
	Oct. 01, 2023	Jan. 18, 2023	Sep. 23, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill acquired - initial measurement				$ 7,200,000	$ 37,907,000
Decrease in goodwill due to working capital adjustment				1,509,000	2,625,000
Goodwill impairment	$ 0			0	0	$ 0
Amortization				19,291,000	18,433,000	17,100,000
Impairment of long-lived assets				0	0	$ 100,000
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]						Other income / (expense), net
Alarm.com
Goodwill [Line Items]
Goodwill acquired - initial measurement				7,200,000	37,907,000
Decrease in goodwill due to working capital adjustment				$ 1,509,000	2,625,000
Intangible assets written off					700,000
EBS
Goodwill [Line Items]
Percentage of business acquired		100.00%
EBS | Alarm.com
Goodwill [Line Items]
Goodwill acquired - initial measurement		$ 7,200,000
Noonlight
Goodwill [Line Items]
Percentage of business acquired			85.00%	85.00%
Decrease in goodwill due to working capital adjustment					$ 2,600,000
Noonlight | Alarm.com
Goodwill [Line Items]
Goodwill acquired - initial measurement			$ 37,900,000
EnergyHub
Goodwill [Line Items]
Accumulated balance of goodwill impairments				$ 4,800,000