Acquisition of Novavax CZ - Schedule of Business Acquisition, Pro Forma Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares
Business Combination and Asset Acquisition [Abstract]
Revenue | $	$ 475,598
Net loss | $	$ (419,896)
Basic net loss per share (in usd per share) | $ / shares	$ (7.04)
Diluted net loss per share (in usd per share) | $ / shares	$ (7.04)