Goodwill and Intangible Assets - (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Gross Carrying Amount of Goodwill

The gross carrying amount of goodwill was as follows (in thousands):

Balance at December 31, 2019	$	920,018
Foreign exchange	17,081
Balance at September 30, 2020	$	937,099

Schedule of Gross Carrying Amounts and Net Book Values of Intangible Assets

The gross carrying amounts and net book values of our intangible assets were as follows (in thousands): 

	September 30, 2020							December 31, 2019
	Remaining Weighted- Average Useful Life (In years)	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Acquired developed technologies	12.7	$	3,324,806	$	(1,083,699)	$	2,241,107	$	3,166,485	$	(864,834)	$	2,301,651
Manufacturing contracts	—	12,533		(12,533)		—		12,025		(12,025)		—
Trademarks	—	2,903		(2,903)		—		2,890		(2,890)		—
Priority review voucher	—	—		—		—		111,101		(111,101)		—
Total finite-lived intangible assets		3,340,242		(1,099,135)		2,241,107		3,292,501		(990,850)		2,301,651
Acquired IPR&D assets		—		—		—		139,326		—		139,326
Total intangible assets		$	3,340,242	$	(1,099,135)	$	2,241,107	$	3,431,827	$	(990,850)	$	2,440,977

Schedule of Estimated Future Amortization Costs

Based on finite-lived intangible assets recorded as of September 30, 2020, and assuming the underlying assets will not be impaired and that we will not change the expected lives of the assets, future amortization expenses were estimated as follows (in thousands): 

Year Ending December 31,	Estimated Amortization   Expense
2020 (remainder)	$	66,819
2021	219,309
2022	172,424
2023	172,424
2024	172,424
Thereafter	1,437,707
Total	$	2,241,107