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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Installation Partner Our installation partner in which we have a 48.2% ownership interest performs installation services for security dealers and also provides installation services for us and certain of our subsidiaries. We account for this investment using the equity method. As of December 31, 2018 and 2017, our investment balance in our installation partner was $0. During the years ended December 31, 2018, 2017 and 2016, we recorded $0.4 million, $0.7 million and $1.3 million of cost of hardware and other revenue in connection with this installation partner. As of December 31, 2018 and 2017, the accounts payable balance to our installation partner was less than $0.1 million. In September 2014, we loaned $0.3 million to our installation partner under a secured promissory note that accrued interest at 8.0%. Interest was payable monthly with the entire principal balance plus accrued but unpaid interest due at maturity in September 2018.