Accounts Receivable, Net - Schedule of Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance			$ (2,168)
(Provision for) / recovery of expected credit losses	$ (400)	$ (100)	(547)	$ (150)
End of period balance	(2,508)		(2,508)
Alarm.com and Certain Subsidiaries
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	(2,122)	(3,670)	(2,035)	(4,442)
(Provision for) / recovery of expected credit losses	(464)	(111)	(619)	(147)
Write-offs	136	338	204	1,146
End of period balance	(2,450)	(3,443)	(2,450)	(3,443)
All Other Subsidiaries
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period balance	(31)	(242)	(133)	(254)
(Provision for) / recovery of expected credit losses	(29)	(7)	72	(3)
Write-offs	2	118	3	126
End of period balance	$ (58)	$ (131)	$ (58)	$ (131)