Accounts Receivable, Net - Schedule of Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	$ (2,168)
(Provision for) / recovery of expected credit losses	(1,156)	$ 775	$ (2,162)
End of period balance	(2,835)	(2,168)
Alarm.com and Certain Subsidiaries
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	(2,035)	(4,442)
(Provision for) / recovery of expected credit losses	(1,199)	860
Write-offs	479	1,547
End of period balance	(2,755)	(2,035)	(4,442)
All Other Subsidiaries
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	(133)	(254)
(Provision for) / recovery of expected credit losses	43	(85)
Write-offs	10	206
End of period balance	$ (80)	$ (133)	$ (254)