Segment Information - Significant Customers (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Product Concentration Risk | Percent of Total Gross Product Revenues | McKesson Corporation
Concentration Risk [Line Items]
Concentration risk percentage	22.00%	20.00%	17.00%
Product Concentration Risk | Percent of Total Gross Product Revenues | Accredo/Curascript
Concentration Risk [Line Items]
Concentration risk percentage	12.00%	15.00%	14.00%
Product Concentration Risk | Percent of Total Gross Product Revenues | Walgreen Co.
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	14.00%	15.00%
Product Concentration Risk | Percent of Total Gross Product Revenues | Lloyds Pharmacy
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%
Credit Concentration Risk | Percent of Accounts Receivable | McKesson Corporation
Concentration Risk [Line Items]
Concentration risk percentage	21.00%	14.00%
Credit Concentration Risk | Percent of Accounts Receivable | Accredo/Curascript
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%
Credit Concentration Risk | Percent of Accounts Receivable | Walgreen Co.
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%
Credit Concentration Risk | Percent of Accounts Receivable | Lloyds Pharmacy
Concentration Risk [Line Items]
Concentration risk percentage	15.00%	19.00%