Summary of Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) source		Dec. 31, 2021 USD ($)		Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($)
Deferred Revenue Arrangement [Line Items]
Number of primary revenue sources | source										3
Service provider contract term (years)										1 year
Service provider renewal term (years)										1 year
Total revenue		$ 208,139	$ 216,138	$ 212,845	$ 205,437	$ 195,290	$ 192,324	$ 188,857	$ 172,498	$ 842,559		$ 748,969		$ 618,003
Percentage of revenue reserved for returns (percent)										1.00%		1.00%		1.00%
Period for returns (up to one year)										1 year
Deferred revenue for contract liabilities		18,332				14,837				$ 18,332		$ 14,837		$ 12,529		$ 10,498
Total cost of revenue		$ 79,572	$ 85,586	$ 87,336	$ 90,087	82,386	$ 80,384	$ 77,367	$ 65,762	$ 342,581	[1]	305,899	[1]	227,428	[1]
Commission costs amortization period		3 years								3 years
Minimum
Deferred Revenue Arrangement [Line Items]
Subscriber contract term (years)										3 years
Maximum
Deferred Revenue Arrangement [Line Items]
Subscriber contract term (years)										5 years
Software License Revenue
Deferred Revenue Arrangement [Line Items]
Total cost of revenue										$ 500		1,100		1,300
Hardware and other revenue
Deferred Revenue Arrangement [Line Items]
Total revenue										322,182		288,597		224,746
Deferred revenue for contract liabilities		$ 5,300				$ 6,000				5,300		6,000
Total cost of revenue	[1]									$ 268,684		239,141		173,889
Hardware and other revenue | Minimum
Deferred Revenue Arrangement [Line Items]
Deferred revenue recognition period										12 months
Hardware and other revenue | Maximum
Deferred Revenue Arrangement [Line Items]
Deferred revenue recognition period										10 years
Alarm.com | Software License Revenue
Deferred Revenue Arrangement [Line Items]
Total revenue										$ 26,800		$ 32,300		$ 38,000

[1] Exclusive of amortization and depreciation shown in operating expenses below.