Goodwill and Intangible Assets - (Tables)

6 Months Ended

Jun. 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	(1,997		)
Balance at June 30, 2020	$	918,021

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): 

	June 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	12.9	$	3,275,569	$	(989,443	)	$	2,286,126	$	3,166,485	$	(864,834	)	$	2,301,651
Manufacturing contracts	—	11,987		(11,987		)	—		12,025		(12,025		)	—
Trademarks	—	2,889		(2,889		)	—		2,890		(2,890		)	—
Priority review voucher	—	—		—			—		111,101		(111,101		)	—
Total finite-lived intangible assets		3,290,445		(1,004,319		)	2,286,126		3,292,501		(990,850		)	2,301,651
Acquired IPR&D assets		—		—			—		139,326		—			139,326
Total intangible assets		$	3,290,445	$	(1,004,319	)	$	2,286,126	$	3,431,827	$	(990,850	)	$	2,440,977

Schedule of Estimated Future Amortization Costs

Based on finite-lived intangible assets recorded as of June 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)	$	130,647
2021	215,415
2022	170,572
2023	170,572
2024	170,572
Thereafter	1,428,348
Total	$	2,286,126