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Accounts Receivable, Net - Schedule of Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning of period balance $ (2,835)  
(Provision for) / recovery of expected credit losses (540) $ (54)
End of period balance (3,199)  
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 (506) (155)
Write-offs 159 68
End of period balance (3,102) (2,122)
All Other Subsidiaries    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning of period balance (80) (133)
(Provision for) / recovery of expected credit losses (34) 101
Write-offs 17 1
End of period balance $ (97) $ (31)