Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amounts of goodwill for the years ended December 31, 2020 and 2019 were as follows (in thousands):


	Year Ended December 31,
	2020		2019
Beginning balance	$	51,154	$	51,967
Goodwill resulting from the acquisition of Novavax CZ	70,662		—
Currency translation adjustments	13,563		(813)
Ending balance	$	135,379	$	51,154

Schedule of Identifiable Intangible Assets

Purchased intangible assets consisted of the following as of December 31, 2020 and 2019 (in thousands):


	December 31, 2020						December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Intangible Assets, Net		Gross Carrying Amount		Accumulated Amortization		Intangible Assets, Net
Finite-lived intangible assets:
Proprietary adjuvant technology	$	9,099	$	(3,374)	$	5,725	$	7,985	$	(2,562)	$	5,423
Collaboration agreements	4,109		(4,109)		—		3,606		(3,448)		158
Total identifiable intangible assets	$	13,208	$	(7,483)	$	5,725	$	11,591	$	(6,010)	$	5,581

Schedule of Estimated Amortization Expense

Amortization expense for the years ended December 2020, 2019 and 2018 was $0.6 million, $0.7 million and $0.7 million, respectively. Estimated amortization expense for existing intangible assets for each of the five succeeding years ending December 31, is as follows (in thousands):


Year	Amount
2021	$	455
2022	455
2023	455
2024	455
2025	455