Accounts Receivable, Net - Schedule of Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	$ (2,835)
(Provision for) / recovery of expected credit losses	(1,508)	$ (1,156)	$ 775
End of period balance	(3,864)	(2,835)
Alarm.com and Certain Subsidiaries
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	(2,755)	(2,035)
(Provision for) / recovery of expected credit losses	(1,399)	(1,199)
Write-offs	431	479
End of period balance	(3,723)	(2,755)	(2,035)
All Other Subsidiaries
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	(80)	(133)
(Provision for) / recovery of expected credit losses	(109)	43
Write-offs	48	10
End of period balance	$ (141)	$ (80)	$ (133)