Revenue Recognition (Details) (USD $)	1 Months Ended		6 Months Ended			12 Months Ended
	Mar. 31, 2013	Oct. 31, 2012	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Revenue Recognition [Abstract]
License revenue CytoDyn and ITM			$ 862,000			$ 2,827,000
License Revenue Salix			82,000		102,000
Upfront license fee received CytoDyn and ITM	200,000	3,500,000		3,700,000
Upfront license fee received Salix							60,000,000
Deferred Revenue Salix			$ 80,000