Intangible Assets and Goodwill - Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible assets
Amortization of acquired intangible assets				$ 0	$ 0	$ 224
Indefinite-lived intangible assets	$ 30,700			30,700	$ 48,700
Non-cash impairment charge, indefinite-lived				$ 18,000		$ 18,677
IPR&D
Intangible assets
Non-cash impairment charge, indefinite-lived	$ 14,500	$ 3,500	$ 11,800
License Rights
Intangible assets
Non-cash impairment charge, finite lived			$ 6,900