Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - facility	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | McKesson Corporation
Concentrations and Significant Customer Information
Concentration risk	36.00%	38.00%	36.00%	37.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | AmerisourceBergen Drug Corporation
Concentrations and Significant Customer Information
Concentration risk	32.00%	28.00%	33.00%	27.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Cardinal Health
Concentrations and Significant Customer Information
Concentration risk	12.00%	11.00%	11.00%	12.00%
Accounts Receivable | Customer Concentration Risk | Two Customers
Concentrations and Significant Customer Information
Concentration risk			76.00%
Accounts Receivable | Customer Concentration Risk | Three Customers
Concentrations and Significant Customer Information
Concentration risk					85.00%
Feraheme
Concentrations and Significant Customer Information
Number of production facilities			2