Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues
Total revenue	$ 50,791	$ 37,172	$ 138,828	$ 104,316
Subscriber revenue
Revenues
Total revenue	$ 32,412	19,048	$ 84,579	58,154
Subscriber revenue | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-09-30
Revenues
Revenue, remaining performance obligation, expected timing of satisfaction, period	60 days		60 days
Advertising revenue
Revenues
Total revenue	$ 17,155	17,556	$ 50,330	41,750
Advertising revenue | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-09-30
Revenues
Revenue, remaining performance obligation, expected timing of satisfaction, period	30 days		30 days
Other revenue
Revenues
Total revenue	$ 1,224	$ 568	$ 3,919	$ 4,412