Intangible assets and goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Finite-lived intangible assets:
Accumulated Amortization	$ 7,179
Intangible Assets, Net
Gross Carrying Amount	283,000
Net Carrying Amount	275,821
Amortization Expense
2016	5,384
2017	21,536
2018	21,536
2019	21,536
2020	21,536
Thereafter	172,293
Changes to carrying amount of goodwill
Additions	155,725
Adjustments	(23)
Balance at end of the period	155,702
IPR&D
Indefinite-lived intangible assets:
Net Carrying Amount	$ 12,000
Licensed IP
Intangible assets
Weighted Average Useful Lives (Years)	12 years 6 months
Finite-lived intangible assets:
Gross Carrying Amount	$ 271,000
Accumulated Amortization	7,179
Finite-Lived Intangible Assets, Net, Total	$ 263,821