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Goodwill and Intangible Assets, Net - Schedule of Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 63,591
Goodwill acquired 0
Ending balance 63,591
Alarm.com  
Goodwill [Roll Forward]  
Beginning balance 63,591
Goodwill acquired 0
Ending balance 63,591
Other  
Goodwill [Roll Forward]  
Beginning balance 0
Goodwill acquired 0
Ending balance $ 0