Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Total revenue	$ 50,460	$ 34,735	$ 88,037	$ 67,144
Subscriber revenue
Revenues
Total revenue	$ 32,218	19,273	$ 52,167	39,106
Subscriber revenue | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-06-30
Revenues
Revenue, remaining performance obligation, expected timing of satisfaction, period	60 days		60 days
Advertising revenue
Revenues
Total revenue	$ 17,269	12,378	$ 33,175	24,194
Advertising revenue | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-06-30
Revenues
Revenue, remaining performance obligation, expected timing of satisfaction, period	30 days		30 days
Other revenue
Revenues
Total revenue	$ 973	$ 3,084	$ 2,695	$ 3,844