Concentrations (Details)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
AmerisourceBergen Corporation [Member]
Concentrations [Line Items]
Percentage of gross sales to total gross sales	33.00%	15.00%	30.00%
Cardinal Health [Member]
Concentrations [Line Items]
Percentage of gross sales to total gross sales	22.00%	23.00%	19.00%
McKesson Corporation [Member]
Concentrations [Line Items]
Percentage of gross sales to total gross sales	29.00%	42.00%	25.00%