Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Revenues
Total revenue	$ 151,184	$ 50,354	$ 149,387
Affiliate revenue
Revenues
Total revenue	$ 77,284		83,256
Affiliate revenue | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-12-31
Revenues
Revenue, remaining performance obligation, expected timing of satisfaction, period	60 days
Advertising revenue
Revenues
Total revenue	$ 68,942		60,323
Advertising revenue | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-12-31
Revenues
Revenue, remaining performance obligation, expected timing of satisfaction, period	30 days
Other revenue
Revenues
Total revenue	$ 4,958		$ 5,808