Basis of Presentation and Summary of Significant Accounting Policies - Customers Who Represent 10% or More Of Total Revenues Or Accounts Receivable Balances (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Sales Revenue, Net | Customer Concentration Risk | AmerisourceBergen Drug Corporation
Concentrations and Significant Customer Information
Concentration risk, including more than 10% (as a percent)	20.00%	28.00%	22.00%	25.00%
Sales Revenue, Net | Customer Concentration Risk | Caremark LLC (Specialty Pharmacy)
Concentrations and Significant Customer Information
Concentration risk, including more than 10% (as a percent)	10.00%	10.00%	10.00%	0.00%
Sales Revenue, Net | Customer Concentration Risk | McKesson Corporation
Concentrations and Significant Customer Information
Concentration risk, including more than 10% (as a percent)	10.00%	13.00%	10.00%	11.00%
Sales Revenue, Net | Geographic Concentration Risk
Concentrations and Significant Customer Information
Approximate percentage of revenues from customers outside the U.S.				17.00%
Accounts Receivable | Credit Concentration Risk | AmerisourceBergen Drug Corporation
Concentrations and Significant Customer Information
Concentration risk, including more than 10% (as a percent)			12.00%		43.00%
Accounts Receivable | Credit Concentration Risk | Caremark LLC (Specialty Pharmacy)
Concentrations and Significant Customer Information
Concentration risk, including more than 10% (as a percent)			10.00%		10.00%