Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets
Gross Carrying Value	$ 26,817	$ 26,817
Accumulated Amortization Expense	(23,834)	(22,059)
Total intangible assets	2,983	4,758
Titles, content and technology
Finite-Lived Intangible Assets
Gross Carrying Value	21,117	21,117
Accumulated Amortization Expense	(18,134)	(16,359)
Total intangible assets	$ 2,983	4,758
Titles, content and technology | Minimum
Finite-Lived Intangible Assets
Estimated Useful Life	3 years
Titles, content and technology | Maximum
Finite-Lived Intangible Assets
Estimated Useful Life	5 years
Customer contracts and related relationships
Finite-Lived Intangible Assets
Estimated Useful Life	5 years
Gross Carrying Value	$ 700	700
Accumulated Amortization Expense	$ (700)	(700)
Trademarks
Finite-Lived Intangible Assets
Estimated Useful Life	7 years
Gross Carrying Value	$ 5,000	5,000
Accumulated Amortization Expense	$ (5,000)	$ (5,000)