Nature of Business and Significant Accounting Policies - Fair Value of Financial Instruments and Major Customers and Suppliers (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Fair value of financial instruments:
Adjustments to fair value	$ 0
Revenue | Customer concentration risk
Concentration risk
Number of distributors who accounted for more than 10% | item	1
Programming rights | Level 3 | Fair Value, Measurements, Nonrecurring
Fair value of financial instruments:
Adjustments to fair value	$ 0	$ (1,000)