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Debt, Commitments and Contingencies - Legal Proceedings (Details) $ in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Oct. 22, 2019 patent | Sep. 30, 2019 USD ($) | Jul. 24, 2019 patent | Jan. 02, 2019 USD ($) | Jun. 26, 2017 patent | Apr. 25, 2017 claim | Aug. 19, 2016 patent | Jun. 02, 2015 patent | Sep. 30, 2017 patent | May 31, 2017 patent | Mar. 31, 2017 patent | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Pending Litigation | Alarm.com and ICN Acquisition, LLC vs. Protect America,Inc. and SecureNet Technologies, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of company's patents allegedly infringed | claim |  |  |  |  |  | 1 |  |  |  |  |  |  |
Pending Litigation | Vivint, Inc. vs. Alarm.com Holdings, Inc |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents allegedly infringed upon by the company |  |  | 2 |  | 4 |  | 5 | 6 |  | 3 | 2 |  |
Number of patents under reexamination |  |  |  |  |  |  |  |  | 2 |  |  |  |
Number of patents allegedly infringed by elements in solution |  |  |  |  |  |  |  | 1 |  |  |  |  |
Settled Litigation | Alarm.com vs. U.S. District Court For The Northern District Of California, Payment |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, payments | $ |  | $ 23.0 |  | $ 5.0 |  |  |  |  |  |  |  |  |
General and administrative | Settled Litigation | Alarm.com vs. U.S. District Court for the Northern District of California |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement | $ |  |  |  |  |  |  |  |  |  |  |  | $ 28.0 | $ 28.0
Subsequent Event | Pending Litigation | EcoFactor, Inc. vs. Alarm.com Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents allegedly infringed upon by the company | 4 |  |  |  |  |  |  |  |  |  |  |  |

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