Basis of Presentation and Summary of Significant Accounting Policies - Concentration and Significant Customer Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Sales Revenue, Net | Customer Concentration Risk | AmerisourceBergen Drug Corporation
Concentrations and Significant Customer Information
Concentration risk, including 10% or more of total revenue (as a percent)	22.00%	24.00%
Sales Revenue, Net | Customer Concentration Risk | McKesson Corporation
Concentrations and Significant Customer Information
Concentration risk, including 10% or more of total revenue (as a percent)	14.00%	10.00%
Accounts Receivable | Credit Concentration Risk | AmerisourceBergen Drug Corporation
Concentrations and Significant Customer Information
Concentration risk, including 10% or more of total revenue (as a percent)	31.00%		13.00%
Accounts Receivable | Credit Concentration Risk | McKesson Corporation
Concentrations and Significant Customer Information
Concentration risk, including 10% or more of total revenue (as a percent)	21.00%		32.00%