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Concentration of credit risk (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Milestone Revenues | Customer Concentration Risk | Collaboration Partner B          
Concentration of risk          
Percentage of concentration risk   100.00%   100.00%  
Milestone Revenues | Customer Concentration Risk | Collaboration Partner C          
Concentration of risk          
Percentage of concentration risk 100.00%   100.00%    
Net Product Revenues | Customer Concentration Risk | Customer A          
Concentration of risk          
Percentage of concentration risk 20.00% 21.00% 19.00% 21.00%  
Net Product Revenues | Customer Concentration Risk | Customer B          
Concentration of risk          
Percentage of concentration risk 13.00% 15.00% 14.00% 14.00%  
Net Product Revenues | Customer Concentration Risk | Customer C          
Concentration of risk          
Percentage of concentration risk 16.00% 14.00% 16.00% 14.00%  
Net Product Revenues | Customer Concentration Risk | Customer D          
Concentration of risk          
Percentage of concentration risk 11.00% 12.00% 12.00% 11.00%  
Accounts Receivable | Credit Concentration Risk | Collaboration Partner A and B          
Concentration of risk          
Percentage of concentration risk         42.00%
Accounts Receivable | Credit Concentration Risk | Collaboration Partner A, B and C          
Concentration of risk          
Percentage of concentration risk     27.00%    
Accounts Receivable | Credit Concentration Risk | Customer A, B, C and D          
Concentration of risk          
Percentage of concentration risk     36.00%   30.00%