Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets, Net
Amortization expense	$ 21,500	$ 21,500	$ 21,500
Amortization Expense
2021	21,536
2022	21,536
2023	21,536
2024	21,536
2025	21,536
Thereafter	64,611
Changes to carrying amount of goodwill
Changes to the carry amount of goodwill	$ 0	0
Licensed IP
Intangible assets
Weighted Average Useful Lives (Years)	12 years 6 months
Finite-lived intangible assets:
Gross Carrying Amount	$ 271,000	271,000
Accumulated Amortization	98,709	77,172
Net Carrying Amount	$ 172,291	$ 193,828