Customer, Supplier and Product Concentration (Details)	12 Months Ended
	Dec. 31, 2013 Supplier	Dec. 31, 2012 Supplier	Dec. 31, 2011 Supplier
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Number of customers considered as concentration risks	3	3	3
Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Number of supplier considered as concentration risks	0	0	0
Product Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	11.80%	12.50%	10.40%
Gross Sales [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	58.00%	58.00%	66.00%
Gross Sales [Member] | Customer Concentration Risk [Member] | Amerisource [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	19.00%	19.00%	23.00%
Gross Sales [Member] | Customer Concentration Risk [Member] | Cardinal [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	23.00%	23.00%	27.00%
Gross Sales [Member] | Customer Concentration Risk [Member] | McKesson [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	16.00%	16.00%	16.00%
Net Revenue [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	41.00%	42.00%	63.00%
Net Revenue [Member] | Customer Concentration Risk [Member] | Amerisource [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	14.00%	14.00%	23.00%
Net Revenue [Member] | Customer Concentration Risk [Member] | Cardinal [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	16.00%	17.00%	25.00%
Net Revenue [Member] | Customer Concentration Risk [Member] | McKesson [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	11.00%	11.00%	15.00%
Gross Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	63.00%	73.00%	72.00%
Gross Accounts Receivable [Member] | Customer Concentration Risk [Member] | Amerisource [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	25.00%	29.00%	29.00%
Gross Accounts Receivable [Member] | Customer Concentration Risk [Member] | Cardinal [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	26.00%	30.00%	34.00%
Gross Accounts Receivable [Member] | Customer Concentration Risk [Member] | McKesson [Member]
Concentration Risk [Line Items]
Concentration Risk (in hundredths)	12.00%	14.00%	9.00%