Segment Information (Details)	6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012	Mar. 31, 2013 GSK License Agreement [Member]	Mar. 31, 2012 GSK License Agreement [Member]	Mar. 31, 2013 GSK License Agreement [Member]	Mar. 31, 2012 GSK License Agreement [Member]
Segment Information (Textual) [Abstract]
Percentage of revenue from major customer	89.00%	89.00%		10.00%	10.00%	10.00%	12.00%
Concentration of trade receivables	92.00%		91.00%

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration