Description of Business and Basis of Presentation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013
Merck Sharp & Dohme Corp.[Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Agreement period term	3 years
Maximum revenue to be received	$ 60.0
California [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Incorporation date	Aug. 01, 1988
Delaware [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Incorporation date	Mar. 01, 2009