Customer, Supplier and Product Concentration (Details) - Percentage of the Company's Gross and Net Sales and Accounts Receivable - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gross Sales [Member]
Concentration Risk [Line Items]
Customer concentration	77.40%	77.80%	76.90%
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Customer concentration	63.80%	70.00%	61.90%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Customer concentration	83.90%	82.80%	85.00%
Amerisource [Member] | Gross Sales [Member]
Concentration Risk [Line Items]
Customer concentration	29.50%	28.00%	38.30%
Amerisource [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Customer concentration	23.30%	23.20%	29.20%
Amerisource [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Customer concentration	35.60%	28.80%	45.40%
Cardinal [Member] | Gross Sales [Member]
Concentration Risk [Line Items]
Customer concentration	15.40%	19.70%	15.90%
Cardinal [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Customer concentration	16.30%	19.50%	13.60%
Cardinal [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Customer concentration	15.10%	26.10%	16.90%
McKesson [Member] | Gross Sales [Member]
Concentration Risk [Line Items]
Customer concentration	32.50%	30.10%	22.70%
McKesson [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Customer concentration	24.20%	27.30%	19.10%
McKesson [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Customer concentration	33.20%	27.90%	22.70%