Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Other Assets Consist Principally of Strategic Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Schedule of Investments [Line Items]
Other assets, net	$ 479	$ 1,979
CeloNova BioSciences, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net		1,500
ViaCyte, Inc. [Member]
Schedule of Investments [Line Items]
Other assets, net	$ 479	$ 479