Intangible Assets - Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Intangible assets
Indefinite-lived intangible assets	$ 27,200	$ 30,700		$ 27,200
Intangible Asset Impairment	3,500			$ 3,500	$ 3,500
IPR&D
Intangible assets
Intangible Asset Impairment	$ 3,500	$ 14,500	$ 3,500