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Intangible assets and goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Amortization Expense    
Remainder of 2019 $ 16,155  
2020 21,536  
2021 21,536  
2022 21,536  
2023 21,536  
Thereafter 107,681  
Changes to carrying amount of goodwill    
Changes to the carry amount of goodwill $ 0  
Licensed IP    
Intangible assets    
Weighted Average Useful Lives (Years) 12 years 6 months  
Finite-lived intangible assets:    
Gross Carrying Amount $ 271,000 $ 271,000
Accumulated Amortization 61,020 55,636
Net Carrying Amount $ 209,980 $ 215,364