Summary of Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) source		Dec. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)		Dec. 31, 2020 USD ($)
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		$ 226,237	$ 221,854	$ 223,875	$ 209,716	$ 208,139	$ 216,138	$ 212,845	$ 205,437	$ 881,682		$ 842,559		$ 748,969
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		22,885				18,332				$ 22,885		$ 18,332		$ 14,837		$ 12,529
Total cost of revenue		$ 81,215	$ 81,405	$ 86,367	$ 76,172	79,572	$ 85,586	$ 87,336	$ 90,087	$ 325,159	[1]	342,581	[1]	305,899	[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										$ 600		500		1,100
Hardware and other revenue
Deferred Revenue Arrangement [Line Items]
Total revenue										312,482		322,182		288,597
Deferred revenue for contract liabilities		$ 4,800				$ 5,300				4,800		5,300
Total cost of revenue	[1]									$ 239,261		268,684		239,141
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										$ 23,200		$ 26,800		$ 32,300

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