Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance	$ 51,154	$ 51,967
Goodwill resulting from the acquisition of Novavax CZ	70,662	0
Currency translation adjustments	13,563	(813)
Ending balance	$ 135,379	$ 51,154