Intangible assets and goodwill (Tables)

9 Months Ended

Sep. 30, 2016

Intangible assets and goodwill

Schedule of intangible assets, net

The components of intangible assets as of September 30, 2016 were as follows (in thousands, except for useful life):

	Weighted-	Gross				Net
	Average Useful	Carrying		Accumulated		Carrying
	Lives (Years)	Amount		Amortization		Amount
Finite-lived intangible assets:
Licensed IP(1)	12.5	$	271,000	$	7,179	$	263,821
Indefinite-lived intangible assets:
Acquired IPR&D(1)	N/A		12,000		—		12,000
		$	283,000	$	7,179	$	275,821

(1) We acquired certain intangible assets as part of the Acquisition, as described further in Note 3.

Schedule of estimated aggregate amortization expense

Estimated aggregate amortization expense based on the current carrying value of amortizable intangible assets, excluding any possible future amortization associated with acquired IPR&D, for which development has not yet been completed, is as follows (in thousands):

		Remainder of
		2016		2017		2018		2019		2020		Thereafter
Amortization expense	$	5,384	$	21,536	$	21,536	$	21,536	$	21,536	$	172,293

Schedule of changes to carrying amount of goodwill

The changes to the carrying amount of goodwill for the nine months ended September 30, 2016 were as follows (in thousands):

	Goodwill
Balance, January 1, 2016	$	—
Additions		155,725
Adjustments		(23)
Balance, September 30, 2016	$	155,702