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Concentration of credit risk and current expected credit losses (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Net Product Revenues | Customer Concentration Risk | Customer A
Concentration of risk
Percentage of concentration risk	20.00%	20.00%	20.00%	19.00%
Net Product Revenues | Customer Concentration Risk | Customer B
Concentration of risk
Percentage of concentration risk	13.00%	14.00%	13.00%	14.00%
Net Product Revenues | Customer Concentration Risk | Customer C
Concentration of risk
Percentage of concentration risk	17.00%	16.00%	17.00%	16.00%
Net Product Revenues | Customer Concentration Risk | Customer D
Concentration of risk
Percentage of concentration risk	10.00%	11.00%	11.00%	12.00%
Accounts Receivable | Credit Concentration Risk | Collaboration Partner A and B
Concentration of risk
Percentage of concentration risk			30.00%		30.00%
Accounts Receivable | Credit Concentration Risk | Customer A, B, C and D
Concentration of risk
Percentage of concentration risk			36.00%		39.00%

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