Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified							12 Months Ended				12 Months Ended				12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Land [Member]	Sep. 30, 2012 Land [Member]	Sep. 30, 2013 Laboratory Fixtures and Equipment [Member]	Sep. 30, 2012 Laboratory Fixtures and Equipment [Member]	Sep. 30, 2013 Laboratory Fixtures and Equipment [Member] Minimum [Member]	Sep. 30, 2013 Laboratory Fixtures and Equipment [Member] Maximum [Member]	Sep. 30, 2013 Building and Improvements [Member]	Sep. 30, 2012 Building and Improvements [Member]	Sep. 30, 2013 Building and Improvements [Member] Minimum [Member]	Sep. 30, 2013 Building and Improvements [Member] Maximum [Member]	Sep. 30, 2013 Office Furniture and Equipment [Member]	Sep. 30, 2012 Office Furniture and Equipment [Member]	Sep. 30, 2013 Office Furniture and Equipment [Member] Minimum [Member]	Sep. 30, 2013 Office Furniture and Equipment [Member] Maximum [Member]	Sep. 30, 2013 Construction in Progress [Member]	Sep. 30, 2012 Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Useful Life							3 years	10 years			3 years	20 years			3 years	10 years
Property and Equipment, Gross			$ 4,359	$ 4,359	$ 13,594	$ 13,004			$ 15,124	$ 14,702			$ 3,592	$ 3,370			$ 529	$ 848
Less accumulated depreciation	(24,353)	(22,673)
Property and equipment, net	$ 12,845	$ 13,610