Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Line Items]
Less accumulated depreciation	$ (25,417)	$ (24,416)
Property and equipment, net	12,968	13,133
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	4,359	4,359
Laboratory Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 12,941	12,858
Laboratory Fixtures and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Useful Life	3 years
Laboratory Fixtures and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Useful Life	10 years
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 16,444	16,114
Building and Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Useful Life	3 years
Building and Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Useful Life	20 years
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 3,473	3,060
Office Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Useful Life	3 years
Office Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Useful Life	10 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 1,168	$ 1,158