Concentrations (Tables)

12 Months Ended

Dec. 31, 2012

Percentage of Gross Sales and Accounts Receivable by Wholesalers and Distributors

The percentage of gross sales and the approximate percentage of aggregate accounts receivable for these wholesalers and specialty distributors for each of the years ended December 31, 2012, 2011 and 2010 are as follows:

Percentage of Gross Sales for the Years Ended:							Percentage of Accounts Receivable at December 31,
Distribution Channel	2012		2011		2010		Distribution Channel	2012		2011		2010
		%		%		%			%		%		%
Wholesalers:							Wholesalers:
AmerisourceBergen Corp.		20.1		17.7		13.9	AmerisourceBergen Corp.		10.3		5.1		4.5
Cardinal Health		19.4		22.5		20.9	Cardinal Health		43.6		35.3		27.5
McKesson Corp		18.5		17.9		38.4	McKesson Corp		7.5		14.8		—
Specialty Distributors:							Specialty Distributors:
Mckesson Specialty		13.1		11.0		3.6	Mckesson Specialty		9.4		15.0		23.7
Metro Medical		11.4		6.7		—	Metro Medical		8.8		9.0		—
Besse Medical		7.3		13.7		—	Besse Medical		3.8		12.4		23.7
Other Distributors		10.2		10.5		23.2	Other Distributors		16.6		8.4		20.6