Basis of Presentation and Summary of Significant Accounting Policies - Concentration and Significant Customer Information (Details) - facility	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Sales Revenue, Net | Customer Concentration Risk | AmerisourceBergen Corporation
Concentrations and Significant Customer Information
Concentration risk	22.00%	20.00%	21.00%	22.00%
Sales Revenue, Net | Customer Concentration Risk | McKesson Corporation
Concentrations and Significant Customer Information
Concentration risk	21.00%	10.00%	19.00%	10.00%
Sales Revenue, Net | Customer Concentration Risk | Caremark LLC (Specialty Pharmacy)
Concentrations and Significant Customer Information
Concentration risk	0.00%	10.00%	0.00%	10.00%
Accounts Receivable | Credit Concentration Risk | AmerisourceBergen Corporation
Concentrations and Significant Customer Information
Concentration risk			26.00%		13.00%
Accounts Receivable | Credit Concentration Risk | McKesson Corporation
Concentrations and Significant Customer Information
Concentration risk			23.00%		32.00%
Feraheme
Concentrations and Significant Customer Information
Number of production facilities			2